Description Catalogue Number 814178 Synonyms Methyltrimethoxysilane Description Trimethoxymethylsilane Product Information CAS number 1185-55-3 EC number 214-685-0 Hill Formula C₄H₁₂O₃Si Chemical formula CH₃Si(OCH₃)₃ Molar Mass 136.22 g/mol HS Code 2931 90 00 Structure formula Image Applications Application Trimethoxymethylsilane for synthesis. CAS 1185-55-3, EC Number 214-685-0, chemical formula CH₃Si(OCH₃)₃. Physicochemical Information Density 0.96 g/cm3 (20 °C) Flash point 9 °C Ignition temperature 225 °C Vapor pressure 2990 hPa (20 °C) Toxicological Information LD 50 oral LD50 Rat 11808 mg/kg LD 50 dermal LD50 Rabbit > 9600 mg/kg Safety Information according to GHS Hazard Pictogram(s) Hazard Statement(s) H225: Highly flammable liquid and vapour. Precautionary Statement(s) P210: Keep away from heat/sparks/open flames/hot surfaces. No smoking. P262: Do not get in eyes, on skin, or on clothing. P403 + P235: Store in a well-ventilated place. Keep cool. Storage class 3 Flammable liquids WGK WGK 1 slightly water endangering Disposal 3 Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C. Safety Information Hazard Symbols Flammable Categories of danger highly flammable R Phrase R 11 Highly flammable. S Phrase S 16-24/25 Keep away from sources of ignition - No smoking.Avoid contact with skin and eyes. Storage and Shipping Information Storage Store below +30°C. Transport Information Declaration (railroad and road) ADR, RID UN 1993 , 3, II Declaration (transport by air) IATA-DGR UN 1993 , 3, II Declaration (transport by sea) IMDG-Code UN 1993 , 3, II Specifications Assay (GC, area%) ≥ 98.0 % (a/a) Density (d 20 °C/ 4 °C) 0.954 - 0.956 Identity (IR) passes test