Description

Octamethyltrisiloxane is a linear, low molecular weight organosilicon compound belonging to the class of volatile methyl siloxanes (VMS). This clear, colorless liquid is valued for its excellent volatility, thermal stability, and inertness, making it a versatile intermediate and functional fluid. It is primarily utilized in the industrial synthesis of silicone polymers and as a carrier or solvent in high-performance formulations. Key industries that rely on this material include personal care, coatings, electronics, and specialty chemical manufacturing.

Application

• Silicone Intermediate: A fundamental building block (monomer or chain extender) in the production of polydimethylsiloxanes (PDMS) and other silicone copolymers.
• Personal Care & Cosmetics: Acts as a volatile carrier solvent in antiperspirants, deodorants, and hair care products, providing a dry, non-greasy feel upon evaporation.
• Release Agents & Lubricants: Used in mold release formulations for plastics, rubber, and composite materials, and as a component in specialty lubricants.
• Coatings & Inks: Serves as a leveling agent and flow control additive to improve surface finish and application properties.
• Electronics & Cleaning: Employed as a solvent or carrier in precision cleaning applications for electronic components and circuit boards.
• Chemical Synthesis: Functions as a reactive intermediate or protecting group in organosilicon chemistry and pharmaceutical synthesis.

Basic Information

Product Name	Octamethyltrisiloxane
CAS No.	107-51-7
Molecular Formula	C8H24O2Si3
Molecular Weight	236.53 g/mol
Synonyms	MDM; Hexamethyldisiloxane, trimethylsilyl terminated; 1,1,1,3,5,5,5-Heptamethyltrisiloxane; Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-; L2; Octamethyl-trisiloxan; HMDSO, trimethylsilyl terminated; Volatile Methyl Siloxane (VMS) L2
EINECS	203-497-4

Quality Control

Our Octamethyltrisiloxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC), to ensure high purity and consistency. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, identity, and impurity profiles. Our production and quality processes are designed to meet the demanding specifications of global industrial and chemical synthesis applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat sources and open flame. Recommended storage temperature is between 15°C and 25°C. Keep container tightly sealed when not in use to prevent moisture absorption and maintain product integrity.

Specification

Item	Specification
Appearance	Clear, colorless liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0%
Refractive Index (n20/D)	1.384 - 1.388
Density (20°C)	0.820 - 0.830 g/mL
Water Content	≤ 0.05%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.