Question 1

Is OP-4 octylphenol polyoxyethylene ether harmful to the human body? Does it affect the environment?

Accepted Answer

OP-4 octylphenol polyoxyethylene ether is irritating to the skin and eyes of the human body, but has low acute toxicity (LD₅₀ > 2000 mg/kg); it is significantly hazardous to the environment, extremely toxic to aquatic organisms and has long-term lasting effects. Detailed Explanation Under normal industrial use conditions, the acute toxicity risk of OP-4 octylphenol polyoxyethylene ether (CAS No.: 9036-19-5) to the human body is relatively controllable. The oral LD₅₀ (rat) is greater than 2000 mg/kg, which classifies it as a low-toxicity substance according to chemical toxicity classification. However, this product is not harmless—direct contact can cause definite health damage: skin contact may cause irritation reactions (H315), and eye contact may cause severe eye irritation (H319). Therefore, strict use of impermeable gloves, protective clothing, and chemical safety goggles is required during handling. The typical flash point is greater than 150°C, making it a non-flammable substance, but under combustion conditions, it may produce carbon monoxide, carbon dioxide, and pungent smoke. From an environmental perspective, the hazard of OP-4 is more prominent. This product is clearly marked as an H410 environmental hazard substance—extremely toxic to aquatic organisms with long-term lasting effects. This means that even trace amounts released into water bodies can cause severe toxicity to fish, aquatic invertebrates, and algae, with persistence and a tendency for bioaccumulation. This product contains an octylphenol structural unit, belonging to the alkylphenol polyoxyethylene ethers (APEOs). Its environmental degradation intermediates (such as octylphenol) persist in the environment for a long time and have endocrine-disrupting activity. It has been included in restricted use lists by multiple national regulations. Overall, the environmental risk of OP-4 is much higher than its acute human toxicity risk. When using this product, in addition to personal protection, companies should prioritize environmental management—it is strictly prohibited to discharge the product or wastewater containing this product directly into natural water bodies, sewers, or soil. All waste must be handled by qualified hazardous waste disposal agencies. The storage area should have impermeable flooring and be equipped with containment dikes. Technical Parameters CategoryItemParameter/Data Human ToxicityAcute Oral Toxicity (Rat)LD₅₀ > 2000 mg/kg (Low Toxicity) Skin IrritationH315 — Causes skin irritation Eye IrritationH319 — Causes serious eye irritation Environmental HazardAquatic Toxicity ClassificationH410 — Very toxic to aquatic life with long lasting effects BiodegradabilityDegradation products (octylphenol) are persistent and have endocrine-disrupting properties Combustion/Explosion PropertiesFlash Point> 150 °C (typical), non-flammable Application Recommendations Given the environmental risk characteristics of OP-4, efforts should focus on controlling its environmental emission pathways during application: Pesticide Emulsifier Application: Ensure no leaks in mixing equipment and pipelines during formulation processing. Rinse wastewater should be collected and treated centrally; direct discharge is prohibited. Textile Printing and Dyeing Application: Residual OP-4 in dyeing residual liquor and washing wastewater should be treated through the plant's wastewater treatment station (e.g., activated carbon adsorption or advanced oxidation) before discharge. Industrial Cleaning and Metalworking Fluid Application: Waste liquid should be disposed of as hazardous waste by a qualified agency; dilution and discharge are not permitted. Priority should be given to circulation and reuse in closed-loop systems to reduce end-of-pipe emissions. Formulation Replacement Trend: In recent years, due to stricter environmental regulations (such as restrictions on APEOs under EU REACH), some application fields may consider using environmentally friendly alternatives such as tty alcohol polyoxyethylene ethers (AEO series) or isomeric alcohol ethers. For more information on alternatives, please consult the Guoli Chemical technical team. Precautions Operators must wear impermeable gloves, protective clothing, and chemical safety goggles. Wash exposed areas thoroughly after operation. Work areas should be equipped with eyewash stations and emergency showers. Use local exhaust ventilation or wear respiratory protection if ventilation is insufficient. Strictly prohibit discharging this product or waste liquid containing it directly into any water bodies, sewers, or soil. In case of leakage, collect with inert absorbent materials (sand, vermiculite) and dispose of as hazardous waste through a qualified unit. Recommended storage temperature: 5°C~40°C. Keep containers sealed and away from strong oxidizing agents and strong acids. For more detailed safety technical information, please refer to the "OP-4 Chemical Safety Data Sheet" (SDS) provided by Guoli Chemical.

Question 2

What should be done if problems occur during the use of OP-4 Octylphenol Polyoxyethylene Ether? How to obtain technical support?

Accepted Answer

If problems occur during the use of OP-4, first stop operation, assess safety conditions, and handle according to emergency procedures; then obtain professional technical support through the official channels of Haian Guoli Chemical Co., Ltd. Common usage issues and countermeasures Problems that may occur during the use of OP-4 Octylphenol Polyoxyethylene Ether are usually classified into the following categories. It is recommended to investigate one by one based on specific manifestations: 1. Poor emulsification effect: If phenomena such as layering or demulsification occur in pesticide formulations, metalworking fluids, or cleaning agent formulations, please check: ① Whether the addition amount of OP-4 is within a reasonable range (usually 2%~10% of the total formulation, which needs to be optimized through experiments based on the specific system); ② Whether the HLB value of the system matches — OP-4 is a lipophilic emulsifier (n≈4, with a low HLB value), suitable for W/O (water-in-oil) emulsion systems. If O/W (oil-in-water) emulsification is required, consider compounding with emulsifiers having higher HLB values; ③ Whether the type of oil phase or water hardness has changed. Calcium and magnesium ions in hard water may affect emulsion stability. Although OP-4 itself has excellent hard water stability, it is still recommended to verify through small-scale tests. 2. Decreased penetration or leveling performance: In textile dyeing and finishing applications, if insufficient penetration or color spots are found, please check: ① Whether the treatment bath temperature is appropriate — the cloud point of OP-4 affects its surce activity, and excessively high temperatures may cause it to precipitate from the aqueous phase; ② Whether the concentration of OP-4 in the working solution has decreased due to carryover loss, and supplement if necessary; ③ Whether there is compatibility issue between residual pretreatment auxiliaries on the bric and OP-4. 3. Abnormal increase in foam: OP-4 itself is a low-foaming surctant. If abnormal foam increase occurs, it may be due to synergistic foaming effects of other components (such as anionic surctants) in the formulation, or contamination of the system. It is recommended to check raw material purity and compatibility of compounding components. 4. Abnormal appearance of the product (turbidity, layering, color deepening): Please confirm whether storage conditions meet requirements (recommended 5°C~40°C, sealed and protected from light). If the product has experienced freezing or overheating, it may cause structural changes. It is recommended to take a sample for small-scale testing to verify performance before deciding whether to continue use. Safety-related emergency handling If safety incidents such as skin contact, eye contact, or leakage occur during use, handle immediately according to the following procedures: Skin contact: Immediately remove contaminated clothing and rinse with soap and plenty of water for at least 15 minutes. If irritation persists, seek medical attention. Eye contact: Immediately hold eyelids open and rinse with plenty of water or saline for at least 15 minutes. Seek medical attention as soon as possible. Leak handling: For small leaks, absorb and collect with inert materials such as sand, vermiculite; for large leaks, build dikes to prevent spreading and do not allow entry into sewers or waterways. Inhalation discomfort: Move to fresh air, keep respiratory tract unobstructed, and seek medical attention if necessary. How to obtain technical support Haian Guoli Chemical Co., Ltd. provides comprehensive technical support services to customers. It is recommended to contact through the following channels: Official technical consultation channels: Official technical service hotline: Directly call the technical department of Guoli Chemical, provide product batch number, usage conditions, and application field. Technical personnel will analyze the problem specifically and provide solutions. Official website online support: Submit a technical consultation form through the official website of Guoli Chemical, attaching detailed problem description, site photos or videos. The technical team will reply within working days. Sales manager contact: Contact your dedicated sales manager to coordinate one-on-one communication with a technical engineer. On-site technical guidance can be arranged if necessary. Please prepare the following information before consultation to help the technical team quickly locate the problem: Product batch number and production date (see packaging label) Specific application field and process conditions (temperature, pH value, dosage, water quality, etc.) Detailed description of the problem phenomenon (preferably with photos or samples) Types and approximate proportions of other components in the formulation (if compounding is involved) Notes For detailed safety technical parameters, be sure to refer to the Safety Data Sheet (SDS) provided with the product, which includes complete hazard overview, first aid measures, fire-fighting measures, and handling and storage specifications. For special application scenarios not explicitly listed in the SDS, it is recommended to conduct sufficient small-scale tests and compatibility experiments before use. OP-4 is very toxic to aquatic life with long lasting effects (H410). Waste liquid and washing water after use must be disposed of by qualified waste treatment agencies, and direct discharge into environmental water bodies is strictly prohibited. If compounding advice or customized application solutions are needed, directly submit requirements to the technical team of Guoli Chemical, and the company will provide targeted formulation guidance based on your specific working conditions.

Question 3

How to purchase OP-4 Octylphenol Polyoxyethylene Ether? What is the minimum order quantity?

Accepted Answer

Purchase process for OP-4 Octylphenol Polyoxyethylene Ether: Contact the sales team of Haian Guoli Chemical Co., Ltd. to obtain the latest quotation. The minimum packaging specification is a 50kg plastic drum, which is recommended as the starting point for ordering. Detailed description OP-4 Octylphenol Polyoxyethylene Ether (CAS No.: 9036-19-5) is a core nonionic surctant product of Guoli Chemical, which is normally available in stable supply. The purchase of this product requires negotiation through official sales channels because the prices of chemical raw materials fluctuate greatly due to ctors such as market conditions, purchase volume, and packaging specifications. The actual transaction price needs to be confirmed with the sales team. According to the product database information of Guoli Chemical, the conventional packaging forms of OP-4 include: 50kg plastic drum, 200kg plastic drum, and IBC tote tank. Among them, the smallest packaging unit is the 50kg plastic drum, which is usually used as a reference baseline for the minimum order quantity. For large-volume purchases (ton-level), shipments are generally made in tote tanks (IBC), which offer better pricing advantages. You can directly call the sales department of Guoli Chemical, or get the latest quotation and delivery method through online consultation on the company's official website. The company supports logistics distribution to all parts of the country, and additional confirmation of the transportation plan may be required for remote areas. All products come with a Safety Data Sheet (SDS), which must be requested when purchasing. Purchase information at a glance ItemDetails Product nameOP-4 Octylphenol Polyoxyethylene Ether (Emulsifier OP-4 / Triton X-45) CAS Number9036-19-5 ManucturerHaian Guoli Chemical Co., Ltd. Packaging specifications50kg plastic drum / 200kg plastic drum / IBC tote tank Minimum packaging50kg plastic drum (usually taken as the minimum ordering starting point) Price descriptionPrices fluctuate with market conditions, please contact the sales team for the latest daily quotation Purchase channelDirectly call the sales department of Guoli Chemical or negotiate through online consultation on the official website Application suggestions Before confirming the purchase order, please clarify your downstream application requirements (pesticide emulsification, textile wetting agent, metal cleaning agent, etc.) so that the sales team can recommend the most suitable specification and packaging form for you. OP-4 is suitable for W/O type emulsification systems. If your formulation requires O/W type emulsifiers, you may need to use OP series products with higher EO numbers (such as OP-10). Precautions This product is highly toxic to aquatic organisms (H410). During purchase and use, local environmental regulations must be complied with, and the product or wastewater containing the product is strictly prohibited from being directly discharged into water bodies. The storage temperature is recommended to be maintained between 5°C and 40°C. In low winter temperatures, stratification or solidification may occur. Before use, return to room temperature and stir evenly; the usage effect will not be affected. The shelf life of the product is generally 2 years (sealed original packaging, in a cool and dry place). Before bulk purchasing, please reasonably assess the inventory turnover cycle to avoid waste due to expiration. For first-time cooperation clients, it is recommended to request samples for small-scale testing to verify formulation compatibility and performance before placing a formal order for bulk purchase.

Question 4

Does OP-4 octylphenol polyoxyethylene ether meet environmental requirements? Can a test report be provided?

Accepted Answer

OP-4 octylphenol polyoxyethylene ether has significant risks in terms of environmental compliance, belongs to chemicals under regulatory concern, and currently there is no specific environmental test report for this product available in the Guoli Chemical product database. Detailed Explanation OP-4 octylphenol polyoxyethylene ether belongs to the alkylphenol polyoxyethylene ether (APEO) class of non-ionic surctants. According to the safety instructions in the Guoli Chemical product database, this product is clearly marked with H410 hazard statement – "Very toxic to aquatic life with long-lasting effects," and it is expressly stipulated that "the product must not be discharged directly into water bodies, and waste must be disposed of by qualified institutions." This indicates that the product itself has significant environmental hazard characteristics in terms of aquatic ecotoxicity and is not an environmentally friendly product. From the perspective of international environmental regulations, APEO substances (including octylphenol polyoxyethylene ether and its degradation product octylphenol) have been included in the key control scope of many international regulations. The EU REACH regulation lists octylphenol as a Substance of Very High Concern (SVHC) because of its endocrine-disrupting properties and environmental persistence; industry standards such as OEKO-TEX Standard 100 and ZDHC (Zero Discharge of Hazardous Chemicals) also set strict limits on APEO residues in textiles. Therefore, in downstream applications, especially in export-oriented industries such as textiles and leather, the environmental compliance risks need to be fully assessed. Technical Parameters Environment-related ParameterDataSource Aquatic Toxicity ClassificationH410 (Very toxic to aquatic life with long-lasting effects)Guoli Chemical Product Database Acute Toxicity (Oral LD₅₀ in Rats)>2000 mg/kg (Low toxicity)Guoli Chemical Product Database BiodegradabilityNo test data available— Environmental Hormone/Endocrine Disrupting PotentialNo test data available (but the degradation product octylphenol is known to have endocrine-disrupting properties)— APEO Residue Test ReportNot available— RoHS/REACH Compliance TestNot available— Application Recommendations OP-4 still has important industrial applications in pesticide emulsification, oil extraction, industrial cleaning, etc., but it is recommended that users conduct compliance assessments based on their specific application scenarios and target markets: Textile and leather export enterprises: If the final product needs to meet international standards such as OEKO-TEX, REACH, it is recommended to evaluate alternatives or strictly control the APEO residue level in the final product. Industrial cleaning and metal processing: Use in closed-loop systems with wastewater treatment cilities to ensure compliant discharge of wastewater. Pesticide formulations: Pay attention to environmental requirements for adjuvants in pesticide registration; some countries and regions have begun to restrict the use of APEO adjuvants in pesticides. Suggested alternative directions: In scenarios with strict environmental requirements, consider environmentally friendly alternatives such as tty alcohol polyoxyethylene ether (AEO) or isomer alcohol ethers. Notes The database currently does not contain specific environmental test reports for OP-4 (such as biodegradability tests, APEO content tests, REACH compliance tests, etc.). If such reports are needed, please contact the Guoli Chemical technical department directly. It is recommended to use activated sludge method or advanced oxidation process for wastewater treatment to degrade OP-4; untreated wastewater containing OP-4 must not be directly discharged into the environment. During operation, strictly follow the protective requirements related to H410 to prevent leakage into soil and water bodies; dispose of waste according to hazardous waste management requirements.

Question 5

What are the advantages of OP-4 Octylphenol Polyoxyethylene Ether compared to other similar products?

Accepted Answer

According to the technical data from Guoli Chemical, compared to similar nonionic surctants, the advantages of OP-4 Octylphenol Polyoxyethylene Ether are mainly reflected in its **excellent water-in-oil (W/O) emulsification specificity**, **superior chemical stability**, and **core low-foaming characteristics**. Below is a detailed analysis based on product data: ### 1. Core Advantages Explained - **Excellent Water-in-Oil (W/O) Emulsification Ability** The ethylene oxide (EO) adduct number of OP-4 is approximately 4, making it a lipophilic nonionic surctant. This enables it to efficiently form stable water-in-oil emulsions when emulsifying oil-based systems such as mineral oils, ts, and organic solvents. Compared to more hydrophilic similar products, it offers better compatibility with oil-phase systems in pesticide emulsifiable concentrates, oil-based cleaners, and leather degreasing. - **Broad and Stable Chemical Compatibility** Its nonionic structure allows it to remain stable in acidic, alkaline, and hard water media without easy hydrolysis or deactivation. This characteristic makes its application scenarios r exceed those of anionic or cationic surctants, especially suitable for strong alkaline environments in textile pretreatment, complex lubrication systems in metalworking, and high-salinity water conditions in petroleum extraction. - **Defoaming and Low-Foaming Properties** Compared to high-EO adduct octylphenol polyoxyethylene ethers, OP-4 has extremely low foam and also possesses certain defoaming capabilities. In industrial circulating cleaning, metalworking fluids, and closed equipment applications, it effectively reduces production issues caused by foam overflow. ### 2. Technical Parameter Comparison | Characteristic Indicator | OP-4 (Guoli Chemical) | Conventional High-EO Similar Products | Advantage Interpretation | | :--- | :--- | :--- | :--- | | **Emulsification Type** | Tends towards **W/O type** | Tends towards O/W type | More suitable for **emulsification and dispersion in oil-based systems**, such as oil suspensions and degreasers. | | **HLB Value Range** | Approximately **8-10** (theoretical estimate) | Usually above 13 | Lies in the golden zone for adsorption at the oil-water interce, providing strong emulsification power for oils and ts. | | **Cloud Point** | Low, **insoluble in water** and appears dispersed | High (>60°C) | Dissolves well in the oil phase at room temperature, unaffected by water temperature. | | **Foam Characteristics** | **Extremely low foam** | High foam | Eliminates the need for additional defoamers, improving efficiency in industrial cleaning and processing. | | **Chemical Stability** | Resistant to acids, alkalis, and hard water | Resistant to acids and alkalis, some not resistant to hard water | More reliable performance in working fluids with large pH fluctuations (e.g., alkaline degreasing). | ### 3. Application Recommendations - **Synthetic Intermediate**: As a key hydrophobic raw material, OP-4 is an ideal precursor for producing anionic sulte esters and sulfonate surctants. Its narrow molecular weight distribution and high purity result in more controllable properties of the final anionic products. - **Industrial Degreasing**: When formulating room temperature or heated heavy oil stain cleaners, its strong penetrating ability and emulsification power for mineral oils, combined with alkaline additives, can quickly remove rust preventive oils and stamping oils from metal surces. - **Pesticide Emulsification**: Especially suitable for formulating organophosphorus and pyrethroid emulsifiable concentrates. It maintains emulsion transparency and stability even in hard water, with no tendency for oil separation or sedimentation. ### 4. Safety and Handling Precautions According to the safety data provided by Guoli Chemical, please note the following when using this product: - **Irritation Protection**: OP-4 causes **serious eye irritation (H319)** and **skin irritation (H315)**. Safety goggles and protective gloves must be worn during handling. - **Environmental Compliance**: This product is very toxic to aquatic life with long-lasting effects (H410). Do not discharge wastewater or waste containing this product directly into sewers or natural water bodies. - **Handling Recommendations**: Use in a well-ventilated area. Seal the container immediately after opening. Store at temperatures between 5°C and 40°C, avoiding moisture absorption.

Question 6

How to store OP-4 Octylphenol Polyoxyethylene Ether? What is the shelf life?

Accepted Answer

OP-4 Octylphenol Polyoxyethylene Ether should be stored in a cool, dry, and well-ventilated warehouse, with a recommended temperature of 5~40°C. Keep the container tightly sealed, and keep away from strong oxidizers and strong acids. Under recommended storage conditions, the typical shelf life is 24 months (2 years) from the date of manucture. Detailed Description OP-4 Octylphenol Polyoxyethylene Ether (CAS: 9036-19-5) is a chemically stable nonionic surctant that does not decompose at room temperature and is non-flammable (flash point > 150°C). Proper storage ensures that the product maintains its excellent water-in-oil emulsifying ability, wetting performance, and chemical stability over a long period, preventing quality degradation due to moisture, high temperature, or impurity contamination. Regarding shelf life, there is no official shelf life parameter for this product in the Guoli Chemical product database. According to industry common standards and the chemical stability of nonionic surctants, under strict compliance with recommended storage conditions (cool, dry, sealed, 5~40°C), the recommended usage period for OP-4 is typically 24 months (2 years) from the date of manucture. For products beyond the recommended period, it is advisable to conduct small-scale tests on key indicators such as appearance, pH value, active content, and emulsifying performance to confirm compliance before continued use. Improper storage (e.g., prolonged exposure to high temperatures, unsealed containers leading to moisture absorption or oxidation, mixing with incompatible substances such as strong acids or strong oxidizers) may cause issues like color deepening, turbidity, stratification, or reduced active content. In such cases, immediate cessation of use is required, and the product should be disposed of by qualified institutions. It is strictly prohibited to discharge waste products directly into water bodies, as they are highly toxic to aquatic life with long-lasting effects (H410). Technical Parameters ParameterSpecificationData Source Chemical StabilityStable at room temperatureGuoli Chemical Database Flash Point> 150°C (typical, non-flammable)Guoli Chemical Database Recommended Storage Temperature5°C ~ 40°CGuoli Chemical Database AppearanceLight yellow to yellow oily liquidGuoli Chemical Database Active Content≥ 99%Guoli Chemical Database Moisture Content≤ 1.0%Guoli Chemical Database HygroscopicityLowGuoli Chemical Database Typical Shelf Life24 months (from date of manucture, industry common standard)Based on industry experience and nonionic surctant stability assessment Application Recommendations As a water-in-oil emulsifier, OP-4 requires special attention to moisture-proof sealing during storage. Since the product has an extremely low moisture content (≤ 1.0%), moisture absorption may affect its emulsifying performance and formulation effects in fields such as pesticide formulations, oil exploration, and textile dyeing and printing. It is recommended to immediately close the container after each use. Using nitrogen blanketing or dry air protection can further extend the product's service life. Before formulation applications (e.g., preparing metal cleaning agents, leather degreasing agents), it is advisable to conduct small-scale tests to verify whether the emulsifying power, dispersibility, and foam characteristics meet process requirements, especially for batches approaching the end of their shelf life. Precautions Incompatible Substances: Keep away from strong oxidizers, strong acids, food, and feed to prevent hazardous reactions or contamination. Container Requirements: Seal immediately after use to prevent moisture absorption and impurity contamination. Recommended container materials include stainless steel, glass, or dedicated plastic containers. Temperature Control: Avoid extreme temperatures and drastic temperature changes. Pay attention to freeze protection in winter (melting point Leak Prevention: The storage area floor should have anti-seepage capability, with containment dikes or drainage channels to prevent leakage into soil and water bodies. Disposal Requirements: Expired or waste products should be disposed of as hazardous waste by qualified institutions. It is strictly prohibited to discharge directly into water bodies (H410).

Question 7

What safety precautions should be taken when using OP-4 Octylphenol Ethoxylate?

Accepted Answer

When using OP-4 Octylphenol Ethoxylate, special attention should be paid to skin and eye protection, and leakage must be strictly prevented to avoid water pollution, as it is very toxic to aquatic life with long-lasting effects (H410). Detailed Explanation OP-4 Octylphenol Ethoxylate (CAS No.: 9036-19-5) is a nonionic surctant with low acute oral toxicity (rat LD₅₀ > 2000 mg/kg), classified as a low-toxicity substance. Its flash point is > 150 °C, making it non-flammable and presenting low fire risk under normal use conditions. However, this product causes significant skin and eye irritation (H315/H319). During operation, impermeable gloves, protective clothing, and chemical safety goggles or ce shields must be worn to avoid direct contact with the body. The greatest environmental risk of this product lies in its aquatic ecotoxicity—the H410 warning indicates that even small amounts released into water can cause extreme toxicity to aquatic organisms, with persistent effects that are difficult to degrade. Therefore, it is strictly forbidden to discharge the product or rinse solutions containing it directly into sewers, surce water, or groundwater. All waste must be handed over to qualified professional agencies for harmless disposal. For storage, keep in a cool, dry, well-ventilated warehouse, with a recommended storage temperature of 5 °C ~ 40 °C, avoiding extreme temperatures and drastic temperature changes. Containers should be promptly resealed after use, kept away from strong oxidizers, strong acids, and other incompatible substances, as well as away from heat sources, sparks, and open flames. The storage area floor should be impermeable, with containment berms or drainage to prevent spill spread. Key Safety Parameters ParameterValue/Description Acute Toxicity (Oral, Rat)LD₅₀ > 2000 mg/kg (Low toxicity) Flash Point> 150 °C (Typical, non-flammable) Skin IrritationH315 — Causes skin irritation Eye IrritationH319 — Causes serious eye irritation Aquatic ToxicityH410 — Very toxic to aquatic life with long-lasting effects Recommended Storage Temperature5 °C ~ 40 °C Emergency Response Guidelines Leak Emergency Response: For small spills, cover with inert absorbent material (e.g., sand, vermiculite) and collect into a dedicated sealed container for disposal as hazardous waste. For large spills, construct dikes or pits to contain, prevent spread to sewers and waterways, and transfer using explosion-proof pumps to dedicated collectors. Rinse water must not flow into public waters. Firefighting Measures: Suitable extinguishing media: water spray, alcohol-resistant foam, dry powder, carbon dioxide. Avoid direct water jets. Firefighters must wear self-contained breathing apparatus and full protective clothing. Combustion may produce carbon monoxide, carbon dioxide, and acrid smoke. Containers exposed to fire should be cooled with water spray. First Aid Measures: In case of skin contact, immediately remove contaminated clothing and wash with soap and plenty of water for at least 15 minutes. In case of eye contact, immediately flush with plenty of water with eyelids held open for at least 15 minutes and seek medical attention promptly. If inhaled, move to fresh air, give oxygen if breathing is difficult. If swallowed, do NOT induce vomiting, rinse mouth with water and seek medical attention immediately. Notes Eating, drinking, or smoking is strictly prohibited in the work area; thoroughly wash exposed areas after handling. Eyewash stations and emergency showers should be available in the operation area, ensuring emergency equipment is ready for use. Avoid generating and inhaling vapors, mists, or aerosols; use local exhaust or respiratory protection if ventilation is insufficient. This product belongs to the alkylphenol ethoxylate (APEO) class, which is restricted in some regions. Verify local regulatory compliance before use. For detailed safety technical information, please refer to the Safety Data Sheet (SDS/MSDS) accompanying the product.

Question 8

How to use OP-4 Octylphenol polyoxyethylene ether? What is the recommended dosage?

Accepted Answer

The usage of OP-4 Octylphenol polyoxyethylene ether varies by application field. This product is a nonionic surctant, and the recommended dosage is usually between 1% and 10%. The specific amount should be determined experimentally based on the formulation system and process conditions. Detailed Description OP-4 (Octylphenol polyoxyethylene (4) ether, CAS No.: 9036-19-5) is a lipophilic nonionic surctant with an HLB value of approximately 8~9. It appears as a light yellow oily liquid and exhibits excellent water-in-oil (W\/O) emulsifying ability. Its molecular structure, featuring a short polyoxyethylene chain (n≈4), imparts low-foaming properties and outstanding chemical stability, maintaining good performance in acidic, alkaline, and hard water media. When using OP-4, it is generally recommended to first mix it thoroughly with the oil phase components, then slowly add the water phase under stirring to fully leverage its W\/O emulsification advantages. For applications requiring stable emulsions, it can be compounded with other surctants having higher HLB values (e.g., OP-7, OP-10, etc.) to achieve better emulsification effects and system stability. The operating temperature is typically controlled between 20°C and 60°C; excessive temperatures may affect emulsion stability. This product is an industrial-grade surctant with high purity content. It has a certain viscosity at room temperature and may stratify or become turbid at low temperatures, which is a normal physical phenomenon. Stir evenly before use, and it will not affect product performance. It is recommended to store at temperatures between 5°C and 40°C, and to seal promptly after opening. Technical Parameters ParameterTypical Value\/Description AppearanceLight yellow oily liquid Ionic TypeNonionic HLB Value (Approximate)About 8~9 Emulsion TypeWater-in-oil (W\/O) type Cloud Point (1% Aqueous Solution)Not available (low EO number, does not dissolve in water at room temperature, appears dispersed) Flash Point>150°C (typical) pH (1% Aqueous Solution)Not available SolubilitySoluble in oils and organic solvents; dispersible in water Acute Toxicity (Oral LD₅₀)>2000 mg\/kg (rat), low toxicity Application Recommendations Based on the product data from Guoli Chemical and common industry practices, the recommended dosage of OP-4 in various application fields is as follows (specific dosage should be optimized through experiments based on the actual formulation): Pesticide Emulsifier: Recommended dosage is 3%~8% of the total formulation. When compounded with high-HLB emulsifiers, it can effectively improve the emulsification and dispersion effect of organophosphorus and pyrethroid active ingredients. Textile Dyeing and Finishing Penetrant\/Leveling Agent: Add 0.5~3 g\/L in the working solution. The dosage is lower for pretreatment penetrants, while it can be appropriately increased for dyeing leveling agents. Industrial and Household Cleaners: Recommended addition of 2%~8% in concentrated formulations, with the dilution ratio adjusted based on the degree of soiling. It has excellent emulsifying and dispersing capabilities for mineral oils and polar soils. Leather Degreasing Agent: Recommended dosage is 0.5%~2% of the working solution, used in combination with auxiliaries such as soda ash to effectively remove natural ts deep within leather fibers. Metalworking Fluids (Cutting Fluids\/Grinding Fluids): Recommended addition of 5%~15% in the concentrate, serving as an emulsifying and lubricating component to help form stable microemulsions. Petroleum Extraction and Processing Additives: Adjust according to specific process conditions, typically 1%~5% of the total system, used for emulsification viscosity reduction and intercial tension regulation. Intermediate for Anionic Surctant Synthesis: Used in stoichiometric ratios in chemical reactions, introducing hydrophilic groups through reactions such as sulfonation or sultion. Precautions Safety Protection: Wear impermeable gloves, protective clothing, and chemical safety goggles during operation. This product is irritating to the skin (H315) and eyes (H319). In case of contact, rinse immediately with plenty of water. Environmental Protection: This product is extremely toxic to aquatic life with long-lasting effects (H410). Do not discharge directly into water bodies; dispose of waste through qualified agencies. Ventilation Requirements: Ensure adequate ventilation in the work area during use, and avoid inhaling vapors or aerosols. Workplaces should be equipped with eyewash stations and emergency showers. Compounding Compatibility: This product is compatible with nonionic and anionic surctants. When used in strong acidic or strong alkaline systems, it is recommended to conduct compatibility tests in advance to confirm stability. Note on Recommended Dosage: The above dosage data are general industry reference ranges, derived from product characteristics based on database and industry experience, and are not official fixed ratios from Guoli Chemical. Users should conduct small-scale optimization based on actual formulations and equipment conditions.

Question 9

In which industries and processes is OP-4 Octylphenol Polyoxyethylene Ether mainly used?

Accepted Answer

OP-4 Octylphenol Polyoxyethylene Ether is mainly used in six major industry sectors: pesticides, textile printing and dyeing, petroleum extraction, industrial cleaning, leather processing, metal processing, and anionic surctant synthesis. Detailed Description OP-4 (Octylphenol Polyoxyethylene Ether, CAS No.: 9036-19-5) is a non-ionic surctant produced by Guoli Chemical ctory, appearing as a light yellow oily liquid with high purity and stable performance. Its core characteristic lies in excellent water-in-oil (W/O) emulsifying ability, along with good wetting, dispersing, and low-foaming properties, exhibiting outstanding chemical stability in acid, alkali, and hard water media. These features make it a key multifunctional additive widely used across various industries. In pesticide formulations, OP-4 serves as an efficient emulsifying component, improving the dispersion uniformity of organophosphorus and pyrethroid active ingredients in water, enhancing the wetting and spreading ability of the spray liquid on plant leaves; in textile printing and dyeing, it can be used as a pre-treatment penetrant to accelerate the penetration of alkali and bleaching solutions, and also as a leveling agent in high-temperature and high-pressure dyeing to prevent color spots; in the petroleum sector, it is used in oil displacement systems for emulsification and viscosity reduction, as well as for pre-treatment of crude oil demulsification and dehydration. Additionally, OP-4 is utilized in industrial and household cleaning agents to formulate metal degreasers and hard surce cleaners, with strong emulsifying and dispersing ability for mineral oils and polar dirt; in leather processing, it acts as a degreasing agent to remove natural ts from leather fibers; in metalworking fluids, it provides emulsification and lubrication to help form stable microemulsions; it also serves as a key starting material for synthesizing anionic surctants such as sultes and sulfonates. Application Area Overview Application Industry Specific Process/Use Functional Role Pesticides Emulsification of organophosphorus and pyrethroid pesticide formulations Emulsifier, improving dispersion uniformity and efficacy Textile Printing and Dyeing bric pre-treatment penetration; high-temperature and high-pressure dyeing leveling Penetrant, Leveling Agent Petroleum Extraction and Processing Emulsification and viscosity reduction in oil displacement systems; pre-treatment for crude oil demulsification and dehydration Emulsifying aid, adjusting intercial tension Industrial and Household Cleaning Degreasing of metal parts; formulation of hard surce cleaners Emulsifying and dispersing component Leather Processing Degreasing of raw hides in liming, bating, and other preparatory stages Degreasing Agent Metal Processing Formulation of cutting fluids, grinding fluids Emulsifier, lubricating additive Surctant Synthesis Sulfonation, sultion, and other unit reactions Synthesis Intermediate Application Recommendations OP-4 is particularly suitable for oil-phase-dominant emulsification system designs, with a relatively low HLB value, making it a typical water-in-oil emulsifier. It is recommended for priority use in the following scenarios: Industrial cleaning formulations requiring low foaming and high emulsification efficiency As a primary or auxiliary emulsifier in pesticide emulsifiable concentrate formulations Processes under harsh conditions such as high temperature, acid, or alkali environments When used as an intermediate for anionic surctant synthesis, hydrophilic groups can be introduced through sulfonation or sultion reactions Precautions Safety Protection: Wear impermeable gloves, protective clothing, and chemical safety goggles during operation, avoiding direct skin and eye contact (H315 Skin irritation, H319 Serious eye irritation) Environmental Protection: Very toxic to aquatic life with long-lasting effects (H410), do not discharge product directly into water bodies; waste must be disposed of by qualified agencies Storage Conditions: Recommended storage temperature 5°C~40°C, in a cool, dry, well-ventilated area, away from strong oxidizers and strong acids Flammability Characteristics: Flash point >150°C, not flammable, but may produce harmful gases such as carbon monoxide in a fire

Question 10

What are the physical and chemical technical parameters of OP-4 octylphenol ethoxylate?

Accepted Answer

OP-4 octylphenol ethoxylate (CAS: 9036-19-5) is a non-ionic oil-soluble surctant with a low HLB value (8.8), appearing as a pale yellow oily liquid at room temperature, with stable comprehensive physical and chemical parameters and an effective content of over 99%. Detailed Description OP-4 octylphenol ethoxylate, chemically named octylphenol polyoxyethylene (4) ether (also known as Triton X-45, emulsifier OP-4), is a non-ionic surctant. Its molecular structure has an ethylene oxide (EO) addition number of about 4, and the hydrophilic group is relatively short, resulting in a low HLB value (8.8). It is insoluble in water but dispersible, and can dissolve in various oils and organic solvents, showing excellent water-in-oil (W\/O) emulsifying ability. This product has high purity (effective content ≥99%), with free alcohol and moisture controlled below 1.0%. It has good chemical stability and can maintain stable performance in acid, alkali, and hard water media. The product has low foaming characteristics, a surce tension of about 28 mN\/m (1% aqueous dispersion, 25°C), and a critical micelle concentration (CMC) of about 1.1×10⁻⁴ mol\/L, making it suitable for industrial systems requiring foam control. In terms of safety, the flash point is above 150°C, making it non-flammable; the acute oral toxicity LD₅₀ > 2000 mg\/kg, which is low toxicity. However, this product is irritating to skin and eyes (H315, H319), and is very toxic to aquatic life with long-lasting effects (H410). Personal protection should be used during handling, and discharge into water bodies must be strictly avoided. Technical Parameters Parameter CategoryParameter NameSpecification\/Value Basic Physicochemical PropertiesAppearancePale yellow to yellow oily liquid Ionic TypeNon-ionic Molecular FormulaC₈H₁₇C₆H₄O(CH₂CH₂O)ₙH, n≈4 Molecular Weight~382 Effective Content≥99% Density (25°C)1.02~1.04 g\/cm³ Refractive Index (20°C)1.490~1.500 Kinematic Viscosity (25°C)~300 mPa·s Thermodynamic PropertiesMelting Point< 0°C Flash Point (Typical)> 150°C Chemical StabilityStable at room temperature Solubility and Surce PropertiesHLB Value8.8 Cloud PointNone (insoluble in water) SolubilitySoluble in oils and organic solvents, dispersible in water Surce Tension (1% aqueous dispersion, 25°C)~28 mN\/m CMC (25°C)~1.1×10⁻⁴ mol\/L Foam PropertiesLow foaming— Quality IndicatorspH Value (1% aqueous solution)5.0~7.0 pH Value (5% aqueous solution)5.0~7.0 Hydroxyl Value145~155 mg KOH\/g Acid Value≤1 mg KOH\/g Saponification Value≤1 mg KOH\/g Iodine Value≤0.5 gI₂\/100g Moisture Content≤1.0% Impurity ControlFree Alcohol≤1% Heavy Metals (as Pb)≤10 mg\/kg Arsenic (As)≤2 mg\/kg Amine Value\/Tertiary Amine Content≤0.5 mg KOH\/g \/ ≤0.1% Safety DataOral LD₅₀ (Rat)> 2000 mg\/kg (Low toxicity) Hazard ClassificationH315 Skin irritation, H319 Eye irritation, H410 Aquatic toxicity Packaging Specifications50kg plastic drum \/ 200kg plastic drum \/ IBC tote Application Suggestions Based on its low HLB value (8.8) and excellent oil solubility, OP-4 is mainly recommended for the following scenarios: Pesticide Emulsifier: As an oil-phase emulsifying component, it enhances the dispersion uniformity and leaf spreadability of organophosphorus and pyrethroid technical materials. It is recommended to be used in combination with high HLB emulsifiers to build a stable emulsion system. Industrial Cleaning and Degreasing: Formulated into metal degreasers and leather degreasing agents, it has strong emulsifying and dispersing power for mineral oils and natural ts, with a wide applicable temperature range. The recommended dosage depends on the oil contamination.

OP-4 Octylphenol Ethoxylate

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Property	Value
CAS No.	9036-19-5
Molecular Formula	C8H17C6H4O(CH2CH2O)nH, n≈4
Appearance	Pale yellow to yellow oily liquid
Ionic Type	Nonionic
Avg. Molecular Weight	~382
Cloud Point	N/A (insoluble in water)
Active Content	≥99%
pH Value(1%)	5.0~7.0
pH Value(5%)	5.0~7.0
Iodine Value	≤0.5 gI₂/100g
Solubility	Soluble in oils and organic solvents; dispersible in water
Surface Tension	~28 mN/m (1%aqueous dispersion, 25°C)
CMC	~1.1×10⁻⁴ mol/L (25°C)
Acid Value	≤1
Saponification Value	≤1 mg KOH/g
Hydroxyl Value	145~155
Moisture	≤1.0
Density	1.02~1.04 (25°C)
Kinematic Viscosity	~300 (25°C)
Refractive Index	1.490~1.500 (20°C)
Flash Point	>150°C
Hygroscopicity	Low
Chemical Stability	Stable at room temperature
Amine Value	≤0.5 mg KOH/g
Tertiary Amine Content	≤0.1%
Foam Property	Low foam
Alkali Resistance	Good
Melting Point	<0°C
Solid Content	≤1%
Free Alcohol	≤1%
Heavy Metal	≤10 mg/kg
Arsenic	≤2 mg/kg