Polyethylene glycol PEG-4000/6000 (CAS No.: 25322-68-3) appears as a white to slightly yellow waxy solid or flakes. With its excellent emulsifying, wetting, dispersing, and solubilizing capabilities, as well as good chemical stability, it demonstrates outstanding tolerance to acids, alkalis, and hard water environments across a wide pH range, making it an indispensable multifunctional additive in many industrial formulations.
In the pharmaceutical industry, PEG-4000/6000 is mainly used as an ointment base, suppository base, and dropping pill carrier. At the same time, as a water-soluble matrix, it can significantly increase the dissolution rate and bioavailability of poorly soluble drugs. In the daily chemical field, it is widely used as a toothpaste humectant (replacing or partially replacing glycerol), conditioner for shampoos and body washes, and as a basic moisturizing factor in skincare products. The textile industry utilizes its antistatic and lubricating properties to impart smoothness and cohesion to synthetic fibers, improving processing performance.
Moreover, PEG-4000/6000 serves as an efficient mold release agent and lubricating dispersant in the rubber and plastics industry; as a coating lubricant and moisturizing plasticizer in the papermaking industry; as a component of quenching fluids and lubricating additive for cutting fluids in metal processing; as a dispersing carrier for wettable powders and water-dispersible granules in pesticide formulations; and as a stationary phase for gas chromatography and an intermediate for bonded-phase synthesis in high-performance liquid chromatography in the analytical testing field. Its application coverage is extremely extensive.
| Application Industry | Specific Process/Use | Function Description |
|---|---|---|
| Pharmaceutical Industry | Ointment base, suppository base, dropping pill carrier, solid dispersion carrier, injection solubilizer | Provides ideal melting characteristics, improves drug solubility, dissolution rate, and bioavailability |
| Daily Chemical Industry | Toothpaste humectant, shampoo/body wash conditioner, moisturizing ingredient in skincare products | Prevents paste from drying out, provides smooth skin feel, reduces surfactant irritation, forms a hydration film |
| Textile Industry | Antistatic agent, lubricant, mercerizing assistant | Reduces fiber friction and static electricity, improves fabric hand feel and processing performance |
| Rubber and Plastics Industry | Mold release agent, lubricating dispersant, functional modifier | Helps products release from molds smoothly, improves compatibility between fillers and resins, adjusts flexibility and surface properties |
| Papermaking Industry | Coating lubricant, moisturizing plasticizer | Improves coating fluidity, prevents sticking to rollers, controls paper moisture content, prevents warping |
| Metal Processing | Quenching fluid component, cutting fluid lubricating component | Regulates cooling rate, reduces quenching deformation and cracking, decreases tool wear |
| Pesticide Formulations | Carrier for wettable powders, carrier for water-dispersible granules | Rapidly disintegrates and disperses active ingredients in water, significantly improves pesticide suspension rate and efficacy utilization |
| Analytical Testing | Stationary phase for gas chromatography, intermediate for HPLC bonded phase synthesis | Separates polar mixtures such as esters and alcohols, participates in column packing modification and end-capping reactions |
Based on the requirements of different industries, it is recommended to consider the impact of molecular weight differences on performance when selecting PEG-4000 or PEG-6000: the higher molecular weight PEG-6000 has a higher melting point and lower hygroscopicity, making it more suitable for applications requiring high thermal stability (such as rubber mold release agents); while PEG-4000 dissolves faster, making it more suitable for pesticide formulations and some pharmaceutical carriers that require rapid disintegration and dispersion. In practical applications, it is recommended to determine the optimal addition ratio through small-scale trials.
Due to the strong hygroscopicity of this product, its moisture absorption characteristics should be fully considered in formulation design and process operations. Especially in daily chemical products and pharmaceutical preparations, this property can be utilized to achieve moisturizing functions, but strict sealing and moisture prevention are required during storage and batching.