Description

Hexamethyldisiloxane is a highly versatile organosilicon compound, widely recognized as a fundamental building block in silicone chemistry. Its primary value lies in its role as a chain terminator in the production of polydimethylsiloxanes (silicone oils and fluids) and as a key intermediate for synthesizing more complex siloxanes and silanes. This product is essential for manufacturers in the silicone polymer, personal care, and electronics industries seeking reliable raw materials for consistent product performance. Its high volatility also makes it valuable as a solvent and carrier fluid in specialized applications.

Application

• Silicone Polymer Manufacturing: Acts as a crucial chain terminating agent (end-blocker) in the production of linear polydimethylsiloxane (PDMS) fluids, controlling polymer molecular weight and viscosity.
• Chemical Intermediate: Serves as a starting material or reagent for the synthesis of more complex organosilicon compounds, including functional silanes and modified siloxanes.
• Electronics & Semiconductor Processing: Used as a solvent or carrier in spin-on dielectric (SOD) formulations and in cleaning applications for silicon wafers due to its high purity and volatility.
• Personal Care & Cosmetics: Functions as a volatile carrier or diluent in antiperspirants, hair sprays, and skin care products, where it evaporates quickly without residue.
• Laboratory & Research: Employed as a reagent in organic synthesis, silylation reactions, and as a standard in analytical chemistry (e.g., GC).
• Water Repellent Treatments: Used in formulations to impart water repellency to textiles, paper, and construction materials.
• Lubricant & Release Agent Base: Forms the basis for specialized lubricants and mold release agents where thermal stability and low surface tension are required.
• Adhesive & Sealant Formulations: Utilized as a modifier or processing aid in silicone-based adhesive and sealant products.

Basic Information

Product Name	Hexamethyldisiloxane
CAS No.	107-46-0
Molecular Formula	C6H18OSi2
Molecular Weight	162.38 g/mol
Synonyms	HMDSO; Bis(trimethylsilyl) ether; Bis(trimethylsilyl) oxide; Oxybis(trimethylsilane); 1,1,1,3,3,3-Hexamethyl-2-oxatrisilane; Dimethylsiloxane dimethyl silicone; Trimethylsiloxytrimethylsilane; Disiloxane, hexamethyl-
EINECS	203-492-7

Quality Control

Our Hexamethyldisiloxane is manufactured under a stringent 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 specific impurity profiles. Our quality commitment ensures the material meets the exacting standards required for applications in silicone polymer synthesis and electronics manufacturing.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and open flame. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and maintain product integrity. Recommended storage temperature is between 15°C and 25°C. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 99.0%
Refractive Index (n20/D)	1.377 - 1.379
Density (20°C)	0.760 - 0.765 g/mL
Boiling Point	≈ 100°C
Water Content (KF)	≤ 0.05%

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