PEG-90M

CAS Number:

25322-68-3 (general PEG CAS)

Chemical / INCI Name:

PEG-90M

Molecular Formula:

 H(OCH2CH2)nOH, where n is approximately 90,000

Molecular Weight:

~ 4,000,000 g/mol (4 million)

Other Names:

Polyethylene Glycol 90M, Poly(oxy-1,2-ethanediyl), α-hydro-ω-hydroxy- (molecular weight approx. 4,000,000), Ultra-high molecular weight PEG

Uses:

PEG-90M is an ultra-high molecular weight polyethylene glycol. Its extremely long polymer chains give it unique rheological properties, making it an exceptional thickener, lubricant, and film former .

· Personal Care & Cosmetics: Used in shaving creams, shaving gels, depilatory products, and facial masks to provide a smooth, lubricious glide and prevent irritation during shaving or hair removal .

· Skin Care: Functions as a film former and viscosity modifier in gels, masks, and serums, providing a unique, silky skin feel .

· Hair Care: Used in styling products to provide hold and conditioning .

· Industrial Applications: Functions as a lubricant, binder, and release agent in ceramics, metalworking, and construction materials .

Origin

PEG-90M is a synthetic polymer produced by the polymerization of ethylene oxide. The "90M" designation indicates a very high molecular weight (approximately 4 million g/mol), achieved through specialized polymerization processes .

What does PEG-90M do in a formulation?

• Viscosity Modifier / Thickener: Provides exceptional thickening at very low concentrations .
• Lubricant: Creates a smooth, slippery, lubricious feel, ideal for shaving products .
• Film Former: Forms a continuous, flexible film on skin or hair .
• Binder: Helps hold ingredients together in solid formulations .
• Water Retention Agent: Helps retain moisture in formulations .

Safety Profile:

· General Hazard Classification: Considered safe for use in cosmetics at typical concentrations .

· Molecular Weight Consideration: High molecular weight PEGs like PEG-90M are not significantly absorbed through the skin due to their large molecular size .

· Purity: High molecular weight PEGs are typically well-purified. Concerns about ethylene oxide or 1,4-dioxane contamination are minimal with high-quality, cosmetic-grade materials .

· Irritation & Sensitization: Generally regarded as non-irritating and non-sensitizing at typical use concentrations .

· Biodegradability: High molecular weight PEGs are less readily biodegradable than low molecular weight PEGs .

· Regulatory Status: Approved for use in cosmetics worldwide .

Technical profile: