Polyethylene glycol PEG-2000 (CAS No.: 25322-68-3) is a white waxy solid or flake at room temperature, with a melting range of approximately 45–55°C. Due to its good thermal reversibility, it can become a transparent viscous liquid when heated and melted, and return to a solid state after cooling. There are usually two basic methods for use: direct melting (applicable for situations requiring solid forming, such as suppository bases, drop pills, ointments, etc.) and aqueous solution preparation (applicable for situations requiring liquid operations, such as textiles, papermaking, coatings, daily chemicals, etc.). The effective content of this product from Guoli Chemical is ≥99%, the pH of a 1% aqueous solution is 4.5~7.5, it is easily soluble in water, non-ionic, and has good compatibility with anionic, cationic, and other non-ionic substances.
When preparing an aqueous solution, slowly add the solid or flake PEG-2000 to warm water (recommended water temperature 40–60°C), stirring continuously until completely dissolved. Due to its hygroscopicity, the product should be sealed promptly after opening to avoid moisture absorption and clumping, which may affect its performance. During melting operations, the operating temperature should be controlled between room temperature and 70°C to avoid local overheating and thermal decomposition; when handling the molten product, wear insulating gloves and protective equipment to prevent burns from high temperatures.
| Parameter Item | Value (Guoli Chemical PEG-2000) |
|---|---|
| Appearance (room temperature) | White to off-white solid/flake |
| Melting range | 45–55°C |
| Molecular weight range | 1800–2200 |
| Effective content | ≥99% |
| pH of 1% aqueous solution | 4.5–7.5 |
| Hydroxyl value | 51–62 mgKOH/g |
| Moisture | ≤0.5% |
| HLB value | Approximately 20 |
| Density | 1.21 g/cm³ |
| Kinematic viscosity at 100°C | 50–65 mm²/s |
| Flash point | >240°C (closed cup method) |
| Cloud point (1% aqueous solution) | >100°C |
| Surface tension (1% aqueous solution, 25°C) | Approximately 63 mN/m |
| Ion type | Non-ionic |
Pharmaceutical preparations:
Cosmetics and personal care products:
Textile industry: As an antistatic agent and soft finishing agent, prepare a 5–20 g/L aqueous solution, treat the fabric by padding or dipping, and dry to impart a smooth and soft hand feel to the fibers.
Metalworking fluids: In water-based cutting fluid formulations, the recommended addition amount is 2%–8%, directly dissolve in the water phase and compound with other additives to provide lubrication and anti-friction effects, along with some rust prevention ability.
Coatings and inks: As a pigment dispersing aid, the recommended addition amount is 2%–10% of the pigment amount, either dissolved in water first or added during the grinding stage to help disperse the pigment evenly and prevent settling.