Question 1

Is polypropylene glycol PPG-200 harmful to the human body? Does it have an impact on the environment?

Accepted Answer

Polypropylene glycol PPG-200 is a low-toxicity chemical product with relatively low harm to the human body, but direct contact should still be avoided; for the environment, it must not be discharged into water bodies and should be properly disposed of according to regulations. Detailed Explanation According to the safety technical data from the Guoli Chemical Product Database, polypropylene glycol PPG-200 is clearly classified as a low-toxicity, non-hazardous substance. Its acute oral toxicity LD50 (rat) is greater than 2,000 mg\/kg, and under the current GHS classification standard, it is not classified as a hazardous substance. This means that under normal industrial usage conditions, its risk to human health is controllable. The main potential impacts on the human body are concentrated in local contact: it may cause mild eye irritation (corresponding to H319 warning), and long-term or repeated skin contact may lead to skin detting and dryness. However, this product has low volatility and a mild nature, making it relatively friendly to production equipment and operating environments. As long as basic safety operating procedures are followed (wearing protective goggles and chemically resistant gloves, maintaining ventilation), risks can be effectively avoided. In terms of environmental impact, the database explicitly requires prohibition of discharging this product into sewers, surce water, or groundwater. In case of leakage, containment should be implemented to prevent entry into water bodies. Waste disposal should be handled by qualified institutions. The product is a polymer that does not degrade quickly in the environment; therefore, although it is not a highly toxic substance, improper discharge may cause cumulative effects on aquatic ecosystems. Strict control of waste liquid disposal is essential. Technical Parameters ParameterData Toxicity ClassificationLow toxicity, non-hazardous GHS ClassificationNot classified as hazardous substance (may cause eye irritation H319) Acute Toxicity LD50 (oral, rat)> 2,000 mg\/kg Flash Point (closed cup)> 150 °C Main Health EffectsMild eye discomfort; prolonged skin contact may cause detting and dryness Environmental Discharge RequirementsProhibited from discharge into sewers and natural water bodies Ecotoxicity DataNo specific ecotoxicological parameters available at present Application Recommendations PPG-200 is widely used in synthetic lubricants, hydraulic fluids, mold release agents, defoamers, initiators for flexible polyurethane foam, and cosmetic intermediates. In these applications, the product dosage and process conditions are within a safe and controllable range. It is recommended that all application scenarios be equipped with local ventilation, and operators should undergo safety training before starting work to ensure human health and production safety. Precautions Eye Protection: Wear chemical safety goggles during operation. In case of contact, immediately rinse with plenty of water for at least 15 minutes. Skin Protection: Wear chemically resistant gloves and thoroughly wash hands after operation. Waste Management: Strictly prohibit direct discharge of waste liquid containing PPG-200 into sewers or natural water bodies. It must be disposed of by qualified waste treatment institutions. Spill Disposal: For small spills, absorb with sand, earth, or vermiculite and collect; for large spills, contain and pump transfer to prevent spread. Storage Conditions: Store in a cool, dry place (recommended 5–35°C), away from fire sources and strong oxidizing agents. Keep containers tightly closed to prevent moisture absorption.

Question 2

What to do if problems occur during the use of Polypropylene Glycol PPG-200? How to obtain technical support?

Accepted Answer

When encountering problems with Polypropylene Glycol PPG-200, it can be resolved through a three-step process: identify the cause, consult the Safety Data Sheet, and contact the Guoli Chemical technical team Common usage issues and troubleshooting methods As a non-ionic polymer, Polypropylene Glycol PPG-200 may encounter problems typically related to storage conditions, formulation compatibility, or operating procedures: 1. Abnormal appearance of product (turbidity, stratification, color deepening): PPG-200 normally appears as a colorless to slightly yellow transparent viscous liquid. If abnormal turbidity or stratification occurs, the possible cause may be too low storage temperature leading to increased viscosity or moisture absorption. It is recommended to check whether the storage environment meets the requirement of 5–35°C and whether the container is kept airtight. If the product has exceeded the 24-month storage period, retesting is required before continued use. 2. Unsatisctory emulsification or dispersion effect: PPG-200 has excellent emulsification and dispersion capabilities, but if the effect is poor, possible causes include: insufficient addition amount, poor compatibility with other components, or the system pH or temperature exceeding the applicable range. It is recommended to gradually adjust the addition ratio within the recommended dosage range, and confirm whether there are strong oxidizers or strong acids/bases in the formulation that are incompatible with polypropylene glycol. 3. Abnormally high viscosity and difficult handling: The viscosity of PPG-200 increases significantly under low temperature conditions. The product can be rewarmed to 20–30°C before use, but direct heating or proximity to ignition sources is strictly prohibited (flash point >150°C, still fire prevention needed). After appropriate warming and stirring, normal fluidity can be restored. 4. Discomfort caused by eye or skin contact: According to GHS classification, PPG-200 may cause eye irritation (H319). In case of contact, eyes should be rinsed immediately with plenty of water or saline for at least 15 minutes, and skin should be thoroughly washed with plenty of water and soap. If irritation persists, seek medical attention and present the product Safety Data Sheet. Ways to obtain technical support Hai'an County Guoli Chemical Co., Ltd. provides multi-level after-sales technical support services to all product users: Consult product documentation: First, refer to the Safety Data Sheet (SDS) provided with the product, which includes detailed physical and chemical parameters, toxicological information, first aid measures, and operating guidelines. Phone/Email technical support: Directly contact the Guoli Chemical technical department, providing the product batch number, process conditions, and specific problem description. The technical staff will provide targeted solutions. On-site technical service: For major technical issues or new product application development, Guoli Chemical technical engineers can be requested to assist on-site with process debugging and formulation optimization. Sample testing service: If product quality deviation is suspected, retained samples or problematic batches can be sent back to Guoli Chemical Quality Inspection Center for retesting and analysis. Technical parameters ParameterValue Product namePolypropylene Glycol PPG-200 Chemical namePolyoxypropylene diol CAS No.25322-69-4 AppearanceColorless to slightly yellow transparent viscous liquid TypeNon-ionic polymer Flash point (closed cup)＞150 °C Toxicity classificationLow toxicity, non-hazardous Acute toxicity LD50 (oral, rat)＞2 000 mg/kg Storage temperatureRecommended 5–35 °C Recommended storage period24 months from production date Usage suggestions Preventive measures: Store the product strictly according to storage conditions (cool, dry, well-ventilated, away from fire sources, heat sources, and strong oxidizers). Seal the container promptly after each use to prevent moisture absorption. Establish product batch usage records for traceability, and prioritize using earlier batches before the storage period expires. Formulation development stage: When developing new applications or formulations, it is recommended to conduct small-scale tests first to verify the compatibility of PPG-200 with other components and the desired effect before scaling up. Guoli Chemical can provide samples and application guidance. Precautions When contacting technical support, please prepare product batch number, purchase date, and usage conditions to quickly locate the issue. Do not mix or store PPG-200 with strong oxidizers. Dispose of waste products and empty containers according to local environmental regulations through qualified agencies; do not discharge into sewers or water bodies. Products exceeding 24 months storage period must be retested and confirmed qualified before use.

Question 3

How to purchase polypropylene glycol PPG-200? What is the minimum order quantity?

Accepted Answer

Polypropylene glycol PPG-200 can be purchased directly through the official sales channel of Guoli Chemical. The actual minimum order quantity is recommended to be confirmed with the sales team. The conventional packaging specification starts with 50kg plastic drums. Detailed Description Polypropylene glycol PPG-200 (CAS No.: 25322-69-4) is one of the main products of Guoli Chemical Co., Ltd. of Hai'an County. The procurement process is convenient and transparent. You can initiate procurement in the following ways: directly call the sales department of Guoli Chemical to get instant quotes and inventory confirmation, or submit procurement requirements through the online inquiry system on the official website. The sales team usually responds within 1 working day and provides a customized quotation plan. Regarding the minimum order quantity (MOQ), the product database does not set a unified rigid standard, mainly because the application scenarios and demand scales of different customers vary greatly. PPG-200 conventional packaging specifications are 50kg plastic drums, 200kg plastic drums, and IBC totes. Generally, for retail or trial orders, it is recommended to start with 50kg packaging, while industrial bulk procurement in tons is more economical. The final optimal MOQ needs to be confirmed one-on-one by the sales colleague based on your actual use, delivery region, and current inventory status. Product pricing is based on RMB/ton as the pricing unit. The specific price is affected by ctors such as raw material fluctuations, order quantity, and transportation distance. The above prices are for reference only. For actual prices, please contact the sales team for the latest quotation. Guoli Chemical recommends that interested customers request product samples for small-scale testing before ordering to ensure that key indicators of PPG-200, such as hydroxyl value (540~590 mgKOH/g) and viscosity (30~40 mm²/s), fully match your formulation requirements. Procurement Process Overview Step 1: Call the sales hotline of Guoli Chemical or submit an inquiry form on the official website, specifying the product name (Polypropylene glycol PPG-200), required quantity, and application. Step 2: The sales team provides a formal quotation (including unit price, packaging method, freight, and delivery time). Step 3: Both parties confirm the order and sign a purchase and sales contract, with technical specifications based on the product COA. Step 4: Make payment as per the contract, and Guoli Chemical arranges production/stock preparation and logistics shipping. Step 5: Receive and inspect the goods. The batch inspection report and Material Safety Data Sheet (MSDS) are attached with the shipment. Packaging and Logistics Information Packaging SpecificationMaterialApplicable Scenario 50kg/drumPlastic drumSmall-scale test, pilot test, small batch production 200kg/drumPlastic drumConventional industrial production procurement IBC toteComposite bulk containerLarge-scale continuous production Notes PPG-200 has hygroscopicity. During transportation and storage, keep the packaging container tightly sealed to prevent product moisture absorption affecting quality. The product flash point is ≥200°C. It is not a dangerous good and does not require special qualifications for conventional logistics transportation. However, it should still be stored away from fire sources and strong oxidizers. It is recommended to control the storage temperature at 5~35°C. The storage period should not exceed 24 months from the date of manucture. After expiration, re-inspection is required before use. For first-time cooperating customers, Guoli Chemical can provide free samples for testing and evaluation. Please apply to the sales team for details.

Question 4

Does polypropylene glycol PPG-200 meet environmental requirements? Can a test report be provided?

Accepted Answer

Polypropylene glycol PPG-200 generally meets environmental requirements under normal use conditions, with low toxicity and non-hazardous properties. However, there is no third-party environmental test report information in the database. If a formal report is needed, it is recommended to directly contact Guoli Chemical. Detailed Description Polypropylene glycol PPG-200 (CAS No.: 25322-69-4) performs well in environmental compliance. According to the safety data in the Guoli Chemical product database, this product has a toxicity classification of "low toxicity" and is not classified as a hazardous substance (not classified as a dangerous substance in GHS classification, only marked as possibly causing eye irritation H319). Its acute toxicity index LD50 (oral, rat) is greater than 2,000 mg/kg, which is in the low acute toxicity range, posing a low risk of direct harm to the ecological environment. Regarding waste disposal, Guoli Chemical clearly requires: Dispose of through qualified waste treatment agencies in accordance with local regulations, and prohibit discharge into sewers, surce water, or groundwater. This indicates that although the product is not a high-risk chemical, standardized environmental procedures must still be followed during end-of-life disposal. PPG-200 has a relatively low molecular weight (190–210) and has some potential for degradation in the environment, but it is not a rapidly biodegradable substance, so it cannot be directly discharged into natural water bodies. Regarding test reports, there is no recorded information on third-party environmental test reports such as RoHS, REACH, or SGS in the Guoli Chemical product database. As an industrial intermediate and lubricant raw material, PPG-200 is generally not directly sold to the end consumer market, and its environmental compliance is mainly determined based on toxicological and environmental data in the Safety Data Sheet (SDS). If your downstream application requires a formal environmental test report (e.g., heavy metal content, harmful substance screening, etc.), it is recommended to directly contact the sales or technical department of Hai'an Guoli Chemical Co., Ltd. to confirm whether they can issue a corresponding batch Certificate of Analysis (COA) or commission a third-party testing agency for specific testing. Technical Parameters ParameterValue/IndexEnvironmental Related Description AppearanceColorless to slightly yellow transparent liquid— Toxicity ClassificationLow toxicity, non-hazardousNot classified as hazardous chemical GHS ClassificationNot classified as hazardous substance (only H319 eye irritation)No hazardous substance labeling required LD50 (Oral, Rat)>2,000 mg/kgLow acute toxicity Heavy Metal Content≤10 ppmComplies with general industrial product standards Arsenic Content (As)≤2 ppmVery low level Flash Point (Closed Cup)>150 °CHigh flash point, non-flammable Active Content≥99%High purity, low impurities Waste Disposal RequirementsProhibit discharge into sewers/water bodies, must be disposed of by qualified agenciesNeed compliant treatment Application Suggestions If you are concerned about the environmental compliance of the product for the following scenarios, it is recommended to take corresponding measures: Export to the EU market: Confirm whether REACH registration or SVHC testing is required, and you may commission a third-party laboratory to screen batch samples of PPG-200. Application as cosmetic raw material: When PPG-200 is used as an intermediate in cosmetics, it is necessary to confirm compliance with the relevant requirements of the "Safety and Technical Standards for Cosmetics". It is recommended to request batch COA and microbial test reports. Application for food contact materials: This product database does not indicate food-grade certification. If indirect food contact is involved, additional migration testing and safety assessment are required. Industrial wastewater treatment: Industrial wastewater containing PPG-200 should undergo biochemical treatment before discharge, as it has a certain COD load and cannot be directly discharged. Notes Key environmental operation points explicitly required in the database: In case of leakage, contain and prevent entry into sewers or water bodies; discarded empty containers may have product residues and must be properly disposed of, not discarded casually. If a formal environmental test report or compliance statement is needed, please directly contact the technical department of Guoli Chemical to obtain the latest batch documentation.

Question 5

What are the advantages of polypropylene glycol PPG-200 compared to other similar products?

Accepted Answer

The core advantage of PPG-200 lies in its low molecular weight, which provides high reactivity, excellent water solubility, low foaming characteristics, and superior operational safety, making it an ideal choice for synthesizing flexible polyurethane foam, high-performance lubricants, and low-foaming surctants. Detailed Explanation Polypropylene glycol PPG-200, a low molecular weight (190~210) polyether polyol produced by Guoli Chemical, stands out with its competitive advantages across multiple dimensions. Compared to similar products with higher molecular weights, such as PPG-400, PPG-600, and PPG-1000, PPG-200 features a hydroxyl value as high as 540~590 mgKOH/g, indicating a much higher density of active hydroxyl groups at the ends of its molecular chains. This property enables ster and more thorough crosslinking reactions with isocyanates when used as a starter in flexible polyurethane foam, resulting in finer cell structures and improved rebound comfort in the final foam products. Additionally, as an intermediate for synthesizing nonionic surctants, its high hydroxyl value provides abundant reaction sites for subsequent chemical modifications such as etherification and esterification, offering r greater flexibility in molecular design compared to higher molecular weight counterparts. Another significant advantage is PPG-200's excellent low-foaming performance and its strong affinity for water-based systems. Unlike medium- and high-molecular-weight counterparts that may cause gelation or turbidity in certain aqueous applications due to increased hydrophobicity (lower cloud point), PPG-200 is clearly water-soluble and has a low surce tension of 31~33 mN/m. It can quickly spread and exert wetting and penetrating effects in aqueous phases without the need for additional cosolvents. Combined with its inherently low foaming nature, this product serves as a core raw material for preparing efficient and long-lasting defoamers in industries such as fermentation, papermaking, and coatings, effectively avoiding secondary foam issues associated with traditional high-foaming surctants—a unique advantage among similar products. In terms of safety and processability, PPG-200 also excels. Its flash point exceeds 200°C, r higher than many low-viscosity organic solvents and some similar products (such as certain polyethylene glycol series) on the market, providing intrinsically safe processing characteristics in high-temperature lubricants, hydraulic fluids, and high-temperature mold release processes. Meanwhile, its acute oral toxicity LD50 is greater than 2000 mg/kg, classifying it as low-toxic and non-hazardous. Its mild skin and eye irritation properties allow it to be used as a safe humectant and emollient intermediate in daily cosmetic formulations. This "dual applicability in industry and daily chemicals" green attribute is a core advantage that high-polymerization-degree similar products can hardly match. Technical Parameters Key IndicatorPPG-200 (Guoli Chemical)Reference Trend for Similar Products (PPG-400/600/1000)Advantage Analysis Average Molecular Weight190~210400→600→1000 (increasing)Lowest molecular weight, highest reactivity Hydroxyl Value (mgKOH/g)540~590280→190→112 (decreasing)Highest hydroxyl value, providing more reaction sites Kinematic Viscosity (40°C, mm²/s)30~40Significantly increases with molecular weightLowest viscosity, easier handling, better permeability Surce Tension (mN/m)31~33Generally increases with molecular weightHigh surce activity, strong wetting and spreading ability Water SolubilitySoluble in waterIncreased hydrophobicity with higher molecular weight, prone to phase separationBest compatibility with water-based systems, fewer formulation constraints Foaming CharacteristicsLow foamingSome varieties have higher foam or require defoamersNaturally low foaming, suitable as core component for defoamers Flash Point (°C)≥200Most above 100, but PPG-200 stands outOutstanding safety in high-temperature processing Application Recommendations Flexible Polyurethane Foam: As a starting polyol, it is recommended to use it in combination with high molecular weight polyether polyols (PPG-200 can account for 5% to 15% of the total polyol content). Its high hydroxyl value helps adjust the crosslinking density of the system, thereby precisely controlling foam hardness and rebound. This is a precise regulation method that cannot be achieved by using high molecular weight polyols alone.Defoamer and Lubricant Manucturing: In high-temperature chain oils or metalworking fluids, a recommended addition amount is 5% to 20%, leveraging its excellent viscosity-temperature performance and low surce tension to enhance lubricating film strength. As a defoamer carrier, it is recommended to compound with hydrophobic silica and other components; its low viscosity and high spreading performance can synergistically enhance defoaming speed.Surctant Synthesis: Taking advantage of its adjustable hydrophilic-lipophilic balance, hydrophilic groups such as ethylene oxide (EO) can be introduced through block copolymerization to synthesize low-foaming nonionic surctants with precise HLB values, especially suitable for green formulations requiring rapid biodegradability and low aquatic toxicity. Precautions Moisture Management: PPG-200 is hygroscopic. After opening the drum, it should be stored in a sealed condition immediately. Prolonged exposure to humid air may increase its moisture content (specification requires ≤0.10%), affecting its performance in anhydrous reaction systems such as polyurethane. Storage Period: The recommended storage period should not exceed 24 months from the date of manucture. Products beyond this period must be retested for key indicators such as hydroxyl value and moisture content before use to ensure consistency of reactivity. Operational Protection: Although it is a low-toxicity product, it may cause mild eye irritation (H319). Please wear chemical safety goggles during operation. Prolonged or repeated skin contact may cause detting and drying. It is recommended to wear chemically resistant gloves and wash promptly.

Question 6

How to store polypropylene glycol PPG-200? What is its shelf life?

Accepted Answer

Polypropylene glycol PPG-200 should be stored in a cool, dry, well-ventilated warehouse, with a recommended storage temperature of 5–35°C. The shelf life is 24 months from the date of production. Detailed Description Polypropylene glycol PPG-200 (CAS No.: 25322-69-4), as a non-ionic high molecular polymer, requires certain storage specifications to maintain its performance and stability. This product is hygroscopic, so it is essential to keep the container tightly sealed during storage; otherwise, it may absorb moisture from the air, leading to quality degradation. In terms of chemical compatibility, PPG-200 has high tolerance to acids, alkalis, and hard water environments. However, during storage, contact with strong oxidizers, strong acids, and strong bases should be avoided to prevent potential chemical reactions. At the same time, it should be kept away from fire and heat sources—although its closed-cup flash point exceeds 150°C, making it a relatively safe material, basic fire prevention regulations for chemical storage must still be followed. Regarding shelf life, Guoli Chemical recommends that the storage period should not exceed 24 months from the date of production. Products beyond this period are not directly discarded, but must be re-inspected to confirm that all indicators are qualified before continued use. This recommendation is based on stability evaluations of the product during long-term storage under recommended conditions. Storage Conditions and Shelf Life Parameters ItemRequirement/Parameter Storage Temperature5–35°C (cool environment) Environmental RequirementsDry, well-ventilated Container StatusKeep tightly sealed to prevent moisture absorption Materials to AvoidFire sources, heat sources, strong oxidizers, strong acids, strong bases Isolation StorageStore separately from food and feed Shelf Life24 months from date of production (use after re-inspection if expired) Hazard ClassificationNon-hazardous, low toxicity Application Recommendations To ensure optimal performance of the product during use, it is recommended to follow the "first-in, first-out" inventory management principle. For products stored long-term, a visual inspection can be conducted before use—under normal conditions, PPG-200 should be a colorless to slightly yellow transparent viscous liquid. If there are obvious phenomena such as cloudiness, stratification, or color darkening, re-inspection or discontinuation of use should be considered. Opened products should be used as soon as possible, and containers should be immediately sealed after each sampling to minimize exposure to air. For large packages, it is recommended to dispense into smaller containers for use to reduce the frequency of opening the main container. Precautions Do not discharge the product into drains, surce water, or groundwater. Empty containers should also be properly disposed of by a licensed waste disposal agency. In case of a spill, small amounts can be absorbed and collected with inert absorbent materials (e.g., sand, vermiculite); large spills should be contained at the source to prevent entry into waterways. Although the product is low-toxicity and non-hazardous, it is recommended to wear chemical safety goggles and chemical-resistant gloves during operation, and maintain good ventilation in the work area. The product may cause mild eye irritation (H319). If it gets into the eyes, flush immediately with plenty of water for at least 15 minutes and seek medical attention as needed.

Question 7

What safety precautions should be taken when using polypropylene glycol PPG-200?

Accepted Answer

Polypropylene glycol PPG-200 is a low-toxicity chemical product and is not classified as a hazardous material under normal conditions. However, during handling, eye protection, ventilation, and adherence to storage and emergency procedures are still required. Detailed explanation Polypropylene glycol PPG-200 (CAS No.: 25322-69-4) has low acute toxicity. The oral LD50 in rats is > 2000 mg/kg, and it is not classified as a hazardous material during normal transport and storage. However, according to GHS classification criteria, this product may cause eye irritation (H319), which is the most concerning risk during use. Long-term or repeated skin contact may also lead to skin detting and dryness, so protective measures must not be overlooked during routine operations. In terms of operational protection, it is recommended that workers wear chemical safety goggles and chemically resistant gloves to avoid direct contact with eyes and skin. The work area should be well-ventilated, and local exhaust ventilation should be used if necessary. After operation, hands and any potentially exposed skin must be thoroughly washed with water and soap. Eating, drinking, and smoking are prohibited in the workplace. Operators should receive systematic training on chemical safety operating procedures. For storage, this product should be kept in a cool (recommended temperature 5–35°C), dry, well-ventilated warehouse, away from ignition sources, heat sources, and strong oxidizers. Containers must be kept sealed to prevent moisture absorption, and stored separately from food, feed, strong acids, and strong alkalis. The recommended storage period is no more than 24 months from the production date. After this period, re-inspection is required before further use. Safety technical parameters ParameterValue Toxicity classificationLow toxicity, non-hazardous Acute toxicity (LD50, oral, rat)> 2000 mg/kg Flash point (closed cup)> 150 °C GHS classificationMay cause eye irritation (H319) Recommended storage temperature5–35 °C Recommended storage period24 months from production date Application safety recommendations PPG-200 is widely used in synthetic lubricants, hydraulic fluids, mold release agents, defoamers, cosmetic intermediates, polyurethane flexible foam, and other fields. In each application scenario, risk assessment is recommended based on specific process conditions: High temperature conditions: Although the flash point is >150°C, in high-temperature applications (e.g., high-temperature chain oil, compressor oil blending), the temperature should be kept well below the flash point and equipment should be sealed. Open operations: During open operations such as mold release agent spraying or defoamer addition, local ventilation should be strengthened to avoid prolonged inhalation of vapor or mist. Cosmetic use: Final products must comply with relevant cosmetic safety regulations to ensure residual monomers and impurities are within safe limits. Leak prevention: During pumping or repackaging, spill containment trays are recommended to prevent accidental leakage into drains or water bodies. Emergency response precautions Skin contact: Immediately remove contaminated clothing and thoroughly flush skin with plenty of water and soap; if irritation occurs, seek medical attention promptly. Eye contact: Immediately flush with plenty of water or saline for at least 15 minutes, lifting eyelids to ensure thorough cleaning; if irritation persists, seek medical attention immediately. Inhalation discomfort: Move the person to fresh air and keep breathing unobstructed; if unwell, seek medical attention. Ingestion: Rinse mouth with water, do NOT induce vomiting, seek medical attention immediately and show product label or safety instructions. Fire fighting: Use water spray, alcohol-resistant foam, dry powder, or carbon dioxide; firefighters must wear self-contained positive pressure breathing apparatus and full protective clothing. Combustion may produce carbon monoxide, carbon dioxide, and incompletely burned hydrocarbons. Spill handling: Small spills: absorb with inert absorbent material (e.g., sand, vermiculite) and collect in a sealed container; large spills: contain the source to prevent entry into drains or water bodies. Waste disposal must be carried out by a licensed waste treatment agency. Do not discharge into drains, surce water, or groundwater. Note: The above information is based on the product database and accompanying Safety Data Sheet of Haian Guoli Chemical Co., Ltd. For more toxicological details, please refer to the complete SDS.

Question 8

How to use Polypropylene Glycol PPG-200? What is the recommended addition amount?

Accepted Answer

Polypropylene Glycol PPG-200 is a multi-purpose nonionic polymer intermediate. It is recommended to use it by batch addition with slow stirring. The specific addition amount varies significantly depending on the application field, typically ranging from 0.5% to 15%. Detailed Explanation Polypropylene Glycol PPG-200 (CAS: 25322-69-4) is a chemical intermediate with flexible usage and excellent compatibility. Its usage method mainly depends on the specific application field: In synthetic formulations (e.g., lubricants, hydraulic fluids), it is usually used as a base component or functional additive, directly mixed with other base oils or ester raw materials in proportion; In defoamer compounding, it can be first mixed with dispersants and carriers to form a defoamer masterbatch before dilution and use; In mold release agent applications, it usually needs to be dissolved in a suitable solvent (such as water or organic solvent) to prepare a working fluid, which is then applied to the mold surce by spraying or brushing. During operation, due to the viscosity and hygroscopicity of PPG-200 (density: 1.004~1.010 g/cm³, kinematic viscosity: 30~40 mm²/s), it is recommended to slowly add it to the formulation system under stirring conditions. If the material viscosity increases due to low winter temperatures, it can be preheated in an environment of 25~35°C for 24 hours in advance until the material recovers fluidity before use. Open flame direct heating is strictly prohibited. When used as a polyol initiator in flexible polyurethane foam production, it must be precisely measured according to the predetermined isocyanate index, forming the polyol component together with other polyether polyols, catalysts, blowing agents, etc. PPG-200 has stable chemical properties and low foam characteristics. It is soluble in various solvents such as water, alcohols, esters, and ketones, giving it broad compounding possibilities. However, before long-term use in strong acid or alkali systems, it is recommended to conduct small-scale stability verification tests first. Recommended Addition Amount Reference Guoli Chemical Database does not have exact standard addition amount data for each application field. The following are general reference ranges based on chemical application practices (actual dosage needs to be determined through formulation experiments): Application FieldRecommended Addition Amount RangeUsage Instructions Synthetic Lubricant Base Oil10% ~ 95%As the main base oil or co-base oil component, blended with synthetic esters, PAO, etc. Fire-Resistant Hydraulic Fluid20% ~ 60%Compounded with water and additives to form high water-based or water-in-oil hydraulic fluid Industrial Mold Release Agent1% ~ 10%Diluted in water or solvent to prepare working fluid, sprayed on mold surce Defoamer Core Raw Material5% ~ 30%As defoaming active substance, compounded with dispersants, emulsifiers, carriers Cosmetic Intermediate0.5% ~ 5%Added as moisturizing lubricant in cream and lotion formulations Flexible Polyurethane Foam Polyol5% ~ 40%Accounts for this proportion in polyol component, affecting foam hardness and resilience Surctant SynthesisAccording to reaction stoichiometric ratioUsed as initiator to participate in ethoxylation or esterification reaction, dosage determined by molecular design Operation and Application Recommendations Feeding Sequence: PPG-200 is usually recommended to be added after the basic liquid components of the formulation are added and before the active ingredients are added, or pre-mixed with other components as a carrier. In defoamer compounding, PPG-200 can be first stirred and dispersed with solid particles such as hydrophobic silica at higher temperatures (e.g., 80~120°C) to prepare a defoamer active masterbatch. Temperature Control: PPG-200 has a flash point greater than 200°C and excellent thermal stability, but it is recommended that the normal operating temperature not exceed 150°C to avoid potential oxidative discoloration. In low-temperature environments, the increase in material viscosity is normal and can be restored after preheating. Precautions Moisture Management: PPG-200 is hygroscopic. Once opened, it should be used as soon as possible. Unused material must be immediately sealed and stored to avoid absorbing moisture from the air, which could affect subsequent use. Especially in polyurethane foam formulations, excessive moisture will react with isocyanate to produce CO₂, affecting cell structure. Safety Protection: The product may cause mild eye irritation (H319). During operation, wear chemical safety goggles and chemical-resistant gloves, and keep the work area well ventilated. Compatibility Testing: Although PPG-200 has good tolerance to acids, bases, and hard water, it is recommended to conduct small-scale compatibility and stability tests when first used in a specific formulation. Storage Period: It is recommended to use within 24 months from the production date. After this period, it must be re-inspected and qualified before use. The storage temperature is recommended to be kept at 5~35°C.

Question 9

What are the main industries and processes where polypropylene glycol PPG-200 is applied?

Accepted Answer

Polypropylene glycol PPG-200 is widely used in seven core industries and process areas, including the polyurethane industry, lubricants and hydraulic fluids, industrial release agents and defoamers, daily cosmetics, and surctant synthesis. Detailed Explanation Polypropylene glycol PPG-200 (CAS number: 25322-69-4) is a nonionic high-molecular polymer, appearing as a colorless to slightly yellow transparent viscous liquid. With its excellent wetting, emulsifying, and solubilizing properties, as well as high tolerance to acid, alkali, and hard water environments, PPG-200 plays a key intermediate role in many industrial fields. Its low toxicity and low volatility also make it popular in the daily chemical industry. In the industrial chain, PPG-200 connects upstream propylene oxide polymerization processes and is widely used downstream in polyurethane materials, industrial lubricants, process aids, and personal care products, serving as an important bridge between basic chemicals and fine chemicals. Application Recommendations According to the Guoli Chemical product database, PPG-200 is specifically applied in the following seven industries and process directions: Lubricant Base Oil: Used as a preferred synthetic base oil for formulating high-temperature chain oils, compressor oils, and gear oils, providing excellent viscosity-temperature performance and oxidation stability. Hydraulic Fluids: As a key component of fire-resistant hydraulic fluids, offering good lubricity and anti-wear protection, suitable for hydraulic systems near high temperatures and ignition sources. Release Agents: High-performance release agent component for polyurethane foam, rubber, and plastic processing, forming a uniform barrier film to improve release efficiency and reduce mold fouling. Defoamers: Core raw material for defoamers, quickly breaking foam in aqueous or oil-phase systems, widely used in fermentation, papermaking, and coatings. Cosmetic Intermediates: As humectants, emollients, and synergists in creams, lotions, and hair products, providing a light skin feel and good compatibility. Polyurethane Flexible Foam Polyol Starter: Basic polyol raw material in flexible polyurethane foam formulations, reacting with isocyanates to build flexible chain segments, directly affecting foam resilience and comfort. Surctant Raw Materials: Used to synthesize low-foam nonionic surctants, dispersants, and emulsifiers, imparting tunable hydrophilic-lipophilic balance and broad compatibility. Technical Parameters Parameter ItemParameter Value Chemical NamePolyoxypropylene diol CAS Number25322-69-4 Product TypeNonionic high-molecular polymer AppearanceColorless to slightly yellow transparent viscous liquid Flash Point (Closed Cup)> 150 °C Toxicity ClassificationLow toxicity, non-hazardous Acute Toxicity LD50 (Oral, Rat)> 2 000 mg/kg HLB ValueNot available Hydroxyl ValueNot available Cloud PointNot available Precautions GHS Classification: May cause eye irritation (H319), wear chemical safety goggles and chemical-resistant gloves during handling. Storage Conditions: Recommended temperature 5–35°C, cool, dry, well-ventilated, keep container tightly sealed to prevent moisture absorption, away from ignition sources, heat sources, and strong oxidizers. Shelf Life: Recommended not to exceed 24 months from the date of manucture; test before use if beyond. Spill Handling: Small spills: absorb with inert material (e.g., sand, vermiculite); large spills: dike source, prevent entry into drains or waterways. Suitable Extinguishing Media: Water fog, alcohol-resistant foam, dry powder, carbon dioxide.

Question 10

What are the physical and chemical technical parameters of polypropylene glycol PPG-200?

Accepted Answer

Polypropylene glycol PPG-200 is a nonionic high molecular polymer, appearing as a colorless to slightly yellow transparent viscous liquid, with a low HLB value (≈1), high hydroxyl value (540~590 mgKOH/g), and good water solubility and organic solvent compatibility. It is an important chemical intermediate and basic raw material. Detailed Description Polypropylene glycol PPG-200 (CAS number: 25322-69-4) is produced by ring-opening polymerization of propylene oxide, with a molecular structure of α-hydro-ω-hydroxy-poly[oxy(methyl-1,2-ethylene)], polymerization degree n≈3-4, and average molecular weight between 190~210. This product belongs to nonionic surctants, with an HLB value of only about 1, strong lipophilicity, but still good solubility in water, while easily soluble in common organic solvents such as alcohols, esters, and ketones. The various physical and chemical indicators of PPG-200 exhibit excellent chemical stability: it remains active in acid, alkali, and hard water environments, not prone to hydrolysis or precipitation; it is hygroscopic but with strict moisture content control (≤0.10%); flash point is as high as ≥200°C, ensuring good processing safety; foam characteristics show low foam, suitable for industrial scenarios requiring rapid defoaming. Its hydroxyl value range is between 540~590 mgKOH/g, which is a key indicator for measuring its reactivity as a polyurethane flexible foam polyol initiator. According to the measured data from the Guoli Chemical product database, PPG-200 has a density of 1.004~1.010 g/cm³ (20°C), kinematic viscosity of 30~40 mm²/s (40°C), refractive index of 1.447~1.450, melting point of approximately -45°C, and surce tension of 31~33 mN/m. The product has an active content ≥99%, acid value ≤0.10 mgKOH/g, saponification value ≤0.5 mgKOH/g, unsaturation Technical Parameters Parameter NameTechnical IndicatorParameter NameTechnical Indicator Product NamePolypropylene Glycol PPG-200CAS Number25322-69-4 Molecular FormulaHO(C₃H₆O)nH, n≈3-4Molecular Weight190~210 AppearanceColorless to slightly yellow transparent liquidIon TypeNonionic HLB ValueAbout 1Active Content≥99% pH Value (1% Aqueous Solution)5.0~7.0pH Value (5% Aqueous Solution)5.0~8.0 Density (20°C)1.004~1.010 g/cm³Kinematic Viscosity (40°C)30~40 mm²/s Refractive Index (25°C)1.447~1.450Surce Tension31~33 mN/m Hydroxyl Value540~590 mgKOH/gAcid Value≤0.10 mgKOH/g Saponification Value≤0.5 mgKOH/gIodine Value＜1 Moisture≤0.10%Solid Content≥99% Free Alcohol≤0.5%Unsaturation＜0.01 meq/g Flash Point (Closed Cup)≥200°CMelting PointApproximately -45°C Heavy Metals (as Pb)≤10 ppmArsenic (As)≤2 ppm Boiling PointNo data availableVapor PressureNo data available Detailed Description Regarding Cloud Point and CMC: PPG-200 has good water solubility, but its cloud point and critical micelle concentration (CMC) are marked as no data available in the Guoli Chemical database. This is related to its low molecular weight (only about 200) and short hydrophilic chain segments. Low molecular weight polypropylene glycols generally do not easily form micelles in water, and the cloud point characteristics are not obvious. Additionally, according to actual database tests, data related to the cloud point of a 1% aqueous solution is not yet included. Regarding Penetration Power: The penetration power parameter of PPG-200 in the database is marked as no data available. In conventional applications, PPG-200 is mainly used as a basic raw material and intermediate. Its penetration performance is not as advantageous compared to specialized penetrants (such as penetrant JFC, etc.), and therefore it is not routinely tested as a main performance indicator. Regarding Viscosity and Temperature Relationship: The kinematic viscosity of PPG-200 at 40°C is 30~40 mm²/s, which is a relatively low viscosity product. As temperature increases, the viscosity further decreases. This characteristic allows it to maintain good fluidity even in low-temperature environments (melting point approximately -45°C), making it very suitable as a base component for hydraulic fluids and lubricating oils. Specific viscosity-temperature characteristic curve data is not available; it is recommended that users conduct tests based on actual working conditions for confirmation. Application Suggestions Based on the above physical and chemical parameters, PPG-200 performs outstandingly in the following areas: Polyurethane Flexible Foam Production: The hydroxyl value of 540~590 mgKOH/g is the core indicator as a polyol initiator, directly determining the crosslinking reaction activity with isocyanates and the final foam's resilience and comfort. Synthetic Lubricating Oil Base Oil: High flash point (≥200°C), low melting point (approximately -45°C), and stable chemical properties make it an ideal choice for formulating high-temperature chain oils, compressor oils, and gear oils. Defoamer Preparation: The low foam characteristics combined with good water dispersibility make it a core raw material for defoamers used in fermentation, papermaking, coatings, and other industries. Surctant Synthesis: As a nonionic intermediate, it can be used to prepare high-performance surctants such as EO/PO block copolymers through further modification reactions like etherification and esterification. Daily Cosmetics

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Property	Value
CAS No.	25322-69-4
Molecular Formula	HO(C3H6O)nH, n≈3-4
Appearance	Colorless to slightly yellow transparent liquid
Ionic Type	Nonionic
Avg. Molecular Weight	190~210
Active Content	≥99%
pH Value(1%)	5.0~7.0
pH Value(5%)	5.0~8.0
Iodine Value	<1
Solubility	Soluble in water; readily soluble in alcohols, esters and ketones
Surface Tension	31~33
Acid Value	≤0.10
Saponification Value	≤0.5
Hydroxyl Value	540~590
Moisture	≤0.10
Density	1.004~1.010
Kinematic Viscosity	30~40
Refractive Index	1.447~1.450
Flash Point	≥200
Hygroscopicity	Hygroscopic
Chemical Stability	Stable
Foam Property	Low foam
Alkali Resistance	Stable
Unsaturation	<0.01
Viscosity	30~40
Melting Point	~-45
Solid Content	≥99%
Free Alcohol	≤0.5%
Heavy Metal	≤10
Arsenic	≤2