Product introduction

YAC-DMDCS are formed by reaction of metallic silicon or ferrosilicon with hydrogen chloride or chlorine. YAC-DMDCS is a colorless clear liquid.

CAS No. 75-78-5
EINECS No. 200-901-0
Formula C2H6Cl2Si
Molecular Weight 129.06
Boiling Point 70°C [760mmHg]
Flash Point -7°C
Color and Appearance Colorless clear liquid
Density 25/25°C 1.07
Refractive Index 1.4022 [25°C]
Min. Purity 99.80%

Methyl chlorosilanes have one to three methyl groups. In the case of YAC-DMDCS dimethyldichlorosilane, dichlorodimethylsilane, two chlorine atoms are available, so that a reaction with excess water produces a linear chain of ether-like linkages between silicon atoms.

As in polyethers, these flexible linkages produce a rubbery polymer, polydimethylsiloxane (PDMS). Trimethylchlorosilane can be used to induce branching and cross-linking in PDMS molecules, while chlorotrimethylsilane serves to end backbone chains, limiting molecular weight.

Packing and Storage

YAC-DTCS2 organofunctional silanes are supplied in 200Kg steel drum.

In the unopened original container YAC-DTCS2 dimethyldichlorosilane has a shelf life of one year in a dry and cool place.