SiSiB® PC5220

Dimethyldichlorosilane

SiSiB® PC5130, SiSiB® PC5220 and SiSiB® PC5310 are formed by reaction of metallic silicon or ferrosilicon with hydrogen chloride or chlorine. SiSiB® PC5220 is a colorless clear liquid.

Technical Data

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

Application

Methyl chlorosilanes have one to three methyl groups. In the case of SiSiB® PC5220 dimethyldichlorosilane, dimethyl dichloro silane, 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 (SiSiB® PC5310) can be used to induce branching and cross-linking in PDMS molecules, while chlorotrimethylsilane serves to end backbone chains, limiting molecular weight.

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