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Silicone Monomers

Dimethyldichlorosilane

CAS NO.
75-78-5
Formula
(CH₃)₂SiCl₂
Molar mass
129.06 g/mol

01 / OVERVIEW

Product overview

One of the principal monomers of the silicone industry. Hydrolysis produces dimethylsiloxane hydrolysate, which is converted by cracking, distillation and polymerization into cyclic siloxanes and polydimethylsiloxanes.

02 / SPECIFICATION

Typical specification

AppearanceTypical requirement; final limits are stated in the confirmed TDS and batch COA.
Molar mass129.06 g/mol
Boiling point (101.3 kPa)approx. 70 °C
Relative densityapprox. 1.06 g/cm³
Purity (GC)≥98.0%
Water contentTypical requirement; final limits are stated in the confirmed TDS and batch COA.
Acidity / hydrolysable chlorineTypical requirement; final limits are stated in the confirmed TDS and batch COA.
Color (Hazen)Typical requirement; final limits are stated in the confirmed TDS and batch COA.
Key impuritiesTypical requirement; final limits are stated in the confirmed TDS and batch COA.

The values shown are typical reference data, not guaranteed sales specifications. Final limits are defined by the agreed TDS, contract and batch COA.

03 / APPLICATIONS

Applications

01

Cyclic siloxanesHydrolysis products are processed into D3, D4, D5 and DMC cyclic siloxanes.

02

Silicone fluidsA principal monomer source for polydimethylsiloxane and hydroxy-terminated silicone fluids.

03

Silicone rubberUsed to manufacture methyl silicone rubber and related base polymers.

04

Dimethylsiloxane intermediatesUsed to prepare linear and cyclic siloxanes of different degrees of polymerization.

04 / HANDLING

Packaging, storage and transport

Keep the handling system dry and preferably under nitrogen. Avoid inhalation and skin/eye contact. Do not flush spills directly with water; follow the SDS and use a compatible inert absorbent.

1

Typical packagingAvailable in sample packs, drums or IBCs depending on product compatibility and order quantity.

2

Sealing requirementsUse a clean, dry and tightly sealed compatible container; nitrogen protection is recommended for moisture-sensitive grades.

3

Storage conditionsStore in a cool, dry and well-ventilated place away from moisture, heat, ignition sources and incompatible materials.

4

Transport and shelf lifeTransport classification and shelf life depend on the exact grade and must follow the latest SDS and confirmed order specification.

Actual packaging, shelf life and dangerous-goods classification must follow the exact grade, order and latest SDS.

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