Product Name: Dimethyldichlorosilane (Synonyms: Dichlorodimethylsilane ) Molecular Formula: (CH3)2SiCl2 Molecular Weight: 129.06 Melting Point: -86â?? Flashing Point: -9â?? Boiling Point: 70.5â?? Vapour Pressure: -16KPa (25â??) Related Density: 1.07g/cm3 (25â??) Specification: Testing Item Standard Assay (%) 99.5 Min Methyltrichlorosilane (%) 0.1 Max. Refractive Index (n 25D) 1.4028 Appearance Colorless Transparent Liquid HS Code: 2931909090 CAS No.: 75-78-5 UN No.: 1162 Hazardous Grade: 3 (8) Packing Type: II Usage: Used in special organic synthesis, used for manufacturing DMC, D4, and silicone rubber and silicone resins, etc. Packages: 200kgs iron drum. Storage: Kept in cool and dry place, prevent from water and fire. As a hazardous substance.