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  • 8.14178 - Trimethoxymethylsilane

8.14178 EMD Millipore


Trimethoxymethylsilane for synthesis. CAS 1185-55-3, EC Number 214-685-0, chemical formula CH₃Si(OCH₃)₃., for synthesis

Synonym: Methyltrimethoxysilane

  • CAS Number 1185-55-3

  • Linear Formula C₄H₁₂O₃Si

  • Molecular Weight 136.22 g/mol

  •  EC Number 214-685-0



packaging   250 ml in Glass bottle (8141780250)
vapor pressure   2990 hPa (20 °C)
density   0.96 g/cm3 (20 °C)
flash point   9 °C
autoignition temp.   225 °C
LD 50 oral   LD50 Rat 11808 mg/kg
LD 50 dermal   LD50 Rabbit > 9600 mg/kg
shipped in   ambient
storage temp.   Store below +30°C.
specifications   Assay (GC, area%): ≥ 98.0 % (a/a)
  Density (d 20 °C/ 4 °C): 0.954 - 0.956
  Identity (IR): passes test

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Safety Information

HS Code 
2931 90 00
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 1 slightly water endangering
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.
Hazard Pictogram(s) 
GHS02  GHS02
Hazard Symbols 
Flammable  Flammable
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
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.
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