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Solvents

Octamethyltrisiloxane

CAS: 107-51-7

Overview

Octamethyltrisiloxane (CAS 107-51-7 ) is a low-viscosity linear silicone fluid used as a carrier solvent, surface modifier, and lubricant across personal care, textile, and industrial applications.

Its silicone backbone delivers exceptional spreadability and surface wetting without leaving heavy residues. This makes it a preferred base fluid where clean, fast-evaporating delivery is required for high-performance products.

In personal care formulations, it functions as a lightweight carrier for active ingredients in skin serums and hair conditioning products. It also improves spreadability and skin feel in antiperspirants and cosmetic blends.

Textile and leather finishing operations use it to impart softness, water repellency, and surface slip to treated substrates. It provides a smooth finish while maintaining the integrity of the underlying material.

In metalworking and automotive lubricant formulations, it serves as a base fluid or co-solvent. It is valued where thermal stability and low surface tension are required for consistent film formation on metal parts.

It also supports emulsification and dispersion processes where silicone-based wetting agents are needed. These agents stabilize formulations or improve substrate penetration in complex chemical mixtures and industrial coatings.

The product is supplied as a clear, low-viscosity liquid available in technical and cosmetic grades. Cosmetic-grade material meets purity standards relevant to personal care applications and sensitive formulations.

Packaging typically ranges from drums to IBC containers, with bulk supply available for industrial volumes. This ensures flexible logistics for both small-scale manufacturing and large-scale chemical processing plants.

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Physical Properties

Melting Point-80 °C
Boiling Point152-153 °C
Density0.820 g/cm³
Flash Point99 °F
Appearanceclear colourless liquid
ColorColourless to Pale Yellow
Formliquid
Water Solubility34μg/L at 23℃
Vapor Pressure5.3hPa at 25℃
Refractive Indexn 20/D 1.384(lit.)
Log P6.6 at 25.3℃

Safety & Handling

Warning GHS02 Hazard Statements H226 Flammable liquid and vapor H413 May cause long lasting harmful effects to aquatic life Precautionary Statements P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P233 Keep container tightly closed. P240 Ground and bond container and receiving equipment. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P242 Use non-sparking tools. P243 Take action to prevent static discharges. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P501 Dispose of contents/container in accordance with local regulations. P370+P378 Use … for extinction. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower.

Trade & Regulatory

HS Code29319090
UN Number1993
ADR Class3
Packing GroupIII
Storage Class3 - Flammable liquids
WGK (Germany)3

Other Names

Trisiloxaneoctamethyl- | 11133555-Octamethyltrisiloxane | dimethyl-bis(trimethylsilyloxy)silane | Pentamethyl(trimethylsilyloxy)disiloxane | Dimethylbis(trimethylsiloxy)silane | 9G1ZW13R0G | Pentamethyl(trimethylsiloxy)disiloxane | Trisiloxane11133555-octamethyl-

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Chemical Properties

CAS Number
107-51-7
EC Number
203-497-4
Mol. Weight
236.53
HS Code
29319090
Category
Solvents

Industries

Documentation