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.
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 | 99.8% |
Methyl chlorosilanes have one to three methyl groups. In the case of SiSiB® PC5220 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 (SiSiB® PC5310) can be used to induce branching and cross-linking in PDMS molecules, while chlorotrimethylsilane serves to end backbone chains, limiting molecular weight.
SiSiB® PC5220 organofunctional silanes are supplied in 200Kg steel drum.
In the unopened original container SiSiB® PC5220 dimethyldichlorosilane has a shelf life of one year in a dry and cool place.