Cyclopentasiloxane (and) Trimethylsiloxysilicate

Chemical Formula:

C₁₀H₃₀O₅Si₅, (C₃H₁₀OSi)n

CAS Number:

541-02-6, 73138-45-1

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Cyclopentasiloxane (and) Trimethylsiloxysilicate

Chemical Formula:

C₁₀H₃₀O₅Si₅, (C₃H₁₀OSi)n

CAS Number:

541-02-6, 73138-45-1

This blend of volatile silicone (Cyclopentasiloxane) and film-forming agent (Trimethylsiloxysilicate) is widely used in cosmetics to provide lightweight feel, durability, and water resistance in formulations such as foundations, sunscreens, and hair styling products.

Characteristics

Molar Weight

Cyclopentasiloxane: ~370.77 g/mol; Trimethylsiloxysilicate: Variable (polymer)

Boiling Point

Cyclopentasiloxane: ~210 °C

Solubility

Insoluble in water; soluble in alcohols and hydrocarbons

Density

~0.95 g/cm³

Forms

Clear, colorless liquid

Odor

Slight, characteristic silicone odor

USES AND APPLICATIONS

Key applications

Water-resistant formulations
Long-wear cosmetics
Sunscreens
Hair styling products
Skin primers
Anti-frizz serums

Industries

Cosmetics
Hair Care
Personal Care
Skincare

Synonyms

D5 and Trimethylsiloxysilicate blend, Silicone Film Former, Volatile Silicone Resin Blend

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