CAS 25322-68-3 · Polymer · Multiple MW Grades
Polyethylene Glycol
PEG / Macrogol · H(OCH₂CH₂)ₙOH · MW 200–35,000+ g/mol
A family of water-soluble polyether polymers ranging from low-viscosity liquids (PEG 200–600) to waxy solids (PEG 1000+). PEG's unique combination of water solubility, low toxicity, chemical inertness, and tunable molecular weight makes it one of the most versatile industrial and pharmaceutical chemicals in use today. Texas-Chem supplies PEG in industrial and USP grades across a range of molecular weights.
Repeat Unit
–OCH₂CH₂–
Flash Point
>200 °C
Solubility
Fully water-soluble
Pack Sizes
Drums · Totes
Structural Formula
Linear polyether — ethylene oxide repeat units capped with hydroxyl end groups
Safety & Regulatory
- NFPA Health
- 1 — Slight hazard
- NFPA Flammability
- 1 — Slight hazard
- NFPA Reactivity
- 0 — Stable
- OSHA PEL
- None established
- ACGIH TLV
- None established
- FDA Status
- GRAS / USP (pharma grades)
- DOT Hazard Class
- Not regulated
- Toxicity
- Very low acute toxicity
SDS available upon request. USP grade required for pharmaceutical and food-contact applications.
Grades & Packaging
Available Grades
Pack Sizes
Multiple molecular weight grades available — contact us to specify PEG 200, 400, 600, 1000, 1500, 3350, or 4000.
Physical & Chemical Properties
| Molecular Formula | H(OCH₂CH₂)ₙOH |
| CAS Number | 25322-68-3 |
| Molecular Weight Range | 200 – 35,000+ g/mol (grade-dependent) |
| Physical State | Liquid (PEG 200–600) / Solid (PEG 1000+) |
| Boiling Point | >200 °C (varies by MW) |
| Flash Point | >200 °C — Low fire hazard |
| Density | 1.05–1.21 g/cm³ (MW-dependent) |
| Vapor Pressure | Negligible at ambient temperature |
| Solubility in Water | Fully soluble (all grades) |
| Viscosity | 4.3 mPa·s (PEG 200) to solid (PEG 4000+) |
| Hygroscopicity | Highly hygroscopic (lower MW grades) |
| Auto-ignition Temp. | >300 °C |
Industrial Applications
Pharmaceuticals
USP-grade PEG is one of the most widely used pharmaceutical excipients — solvent, carrier, and base for oral liquids, topical ointments, suppositories, and injectable formulations. PEGylation of proteins extends drug half-life.
Cosmetics & Personal Care
Humectant, emollient, and solubilizer in skin creams, lotions, shampoos, and toothpaste. PEG 400 and PEG 600 are standard cosmetic ingredients for moisture retention and texture improvement.
Industrial Lubricants
Water-soluble lubricant base for metalworking fluids, hydraulic fluids, and gear oils. PEG lubricants are biodegradable and do not leave oily residues, making them preferred for food-grade and environmentally sensitive applications.
Textile Processing
Lubricant, softener, and antistatic agent in fiber spinning, yarn sizing, and fabric finishing. PEG improves processability and reduces static buildup in synthetic fiber production.
Paper & Printing
Release agent and humectant in paper coatings and printing inks. Prevents ink drying in inkjet systems and improves paper surface properties.
Chemical Synthesis
Phase-transfer catalyst and reaction medium in organic synthesis. PEG 400 and PEG 600 are used as green solvents for reactions requiring a polar, non-volatile, water-miscible medium.
Why Source PEG from Texas-Chem?
- 35+ years supplying industrial glycols to Texas manufacturers
- Industrial and USP grades across multiple molecular weights
- Flexible packaging from 55-gal drums to 275-gal totes
- Competitive pricing backed by top-tier producer relationships
- Technical support and SDS documentation with every order
- Same-day quotes — specify your MW grade when requesting