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8.00885 EMD Millipore

Trimethyl orthoformate

Trimethyl orthoformate for synthesis. CAS 149-73-5, EC Number 205-745-7, chemical formula CH(OCH₃)₃., for synthesis

Synonym: Methyl orthoformate, Orthoformic acid trimethyl ester

  • CAS Number 149-73-5

  • Linear Formula C₄H₁₀O₃

  • Molecular Weight 106.12 g/mol

  •  EC Number 205-745-7



Related Categories Biochemicals and Reagents More...
packaging   250 ml in Glass bottle (8008850250)
bp   102 °C (1013 hPa)
expl. lim.     1.4 - 44.6 %(V)
vapor pressure   10 hPa (7 °C)
solubility   10 g/l Hydrolysis
density   0.97 g/cm3 (20 °C)
flash point   13 °C
autoignition temp.   255 °C
mp   -53 °C
LD 50 oral   LD50 Rat 3130 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): 0.968 - 0.970
  Identity (IR): passes test

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Safety Information

HS Code 
2915 90 70
Hazard Statement(s) 
H225: Highly flammable liquid and vapour.
H319: Causes serious eye irritation.
Precautionary Statement(s) 
P210: Keep away from heat/sparks/open flames/hot surfaces. No smoking.
P233: Keep container tightly closed.
P260: Do not breathe vapour.
P262: Do not get in eyes, on skin, or on clothing.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
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 Pictogram(s) 
GHS07  GHS07
Hazard Symbols 
Flammable  Flammable
Hazard Symbols 
Irritant  Irritant
Declaration (railroad and road) ADR, RID 
UN 3272 , 3, II
Declaration (transport by air) IATA-DGR 
UN 3272 , 3, II
Declaration (transport by sea) IMDG-Code 
UN 3272 , 3, II
Categories of danger 
highly flammable, irritant
R Phrase 
R 11-36
Highly flammable.Irritating to eyes.
S Phrase 
S 16-23-24-26
Keep away from sources of ignition - No smoking.Do not breathe vapour.Avoid contact with skin.In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
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