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CAS Number: 681-84-5
Sum Formula: C4H12O4Si
Molar Mass: 152.22 g/mol
German Synonyms: Tetramethylorthosilikat | Tetramethoxysilan | Kieselsäuretetramethylester
English Synonyms: Tetramethyl orthosilicate | Silicic acid, tetramethyl ester
EC Number: 211-656-4
Structural Formula Tetramethyl orthosilicate

Disclaimer: The CLP/GHS classification is not regularly updated in Chemsafe. For up-to-date information, please use the ECHA database. ( https://echa.europa.eu/en/information-on-chemicals )

GHS Hazard and Category:
  • Flam. Liq. 2: flammable liquids, category 2
GHS Pictogram:
pictogram flammable





GHS Signal Word: Danger
GHS Hazard Statement:
  • H225: Highly flammable liquid and vapour.

Antoine parameters
1 1987 Stephenson, R.M.; Malanowski, S. 7.4019 kPa UTI: 137-1705-25183/0-39
UTI: 137-1705-25183/0-39;
Line no Upper temperature limit of Antoine equation Lower temperature limit of Antoine equation Antoine constant C Antoine constant B Antoine constant A
  • saturated
  • property of pure substance
  • saturated
  • property of pure substance
  • saturated
  • property of pure substance
  • saturated
  • property of pure substance
  • defined value
  • saturated
  • property of pure substance
1 381 K 278 K 0 K 2128.2 K 7.4019 kPa
Bibliographic data
Author Stephenson, R.M.; Malanowski, S.
Year 1987
Title Handbook of The Thermodynamics of Organic Compounds
Publisher Elsevier; New York, Amsterdam, London
Language ENGL
Boiling point
1 1991 Physikalisch-Technische Bundesanstalt (PTB) 1013.25 hPa 121 °C UTI: 4801-1705-25189/0-39
UTI: 4801-1705-25189/0-39;
Line no Boiling temperature Pressure
  • defined value
  • at atmospheric pressure
  • saturated
  • property of pure substance
  • saturated
1 121 °C 1013.25 hPa
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 1991
Title Empfohlene Sicherheitstechnische Kenngrößen
Database PTB
Publisher Datenbank PTB-AG 3.41/3.71
Language GERM
Density
1 1991 Physikalisch-Technische Bundesanstalt (PTB) 1013.25 hPa 20 °C 1.023 g/cm3 UTI: 4801-1705-25190/0-39
UTI: 4801-1705-25190/0-39;
Line no Density Temperature Pressure
  • defined value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • property of pure substance
1 1.023 g/cm3 20 °C 1013.25 hPa
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 1991
Title Empfohlene Sicherheitstechnische Kenngrößen
Database PTB
Publisher Datenbank PTB-AG 3.41/3.71
Language GERM
Melting point
1 1987 Stephenson, R.M.; Malanowski, S. 278.5 K UTI: 137-1705-25181/0-39
UTI: 137-1705-25181/0-39;
Line no Melting temperature
  • defined value
  • at atmospheric pressure
  • property of pure substance
1 278.5 K
Bibliographic data
Author Stephenson, R.M.; Malanowski, S.
Year 1987
Title Handbook of The Thermodynamics of Organic Compounds
Publisher Elsevier; New York, Amsterdam, London
Language ENGL
2 1991 Physikalisch-Technische Bundesanstalt (PTB) 5 °C UTI: 4801-1705-25188/0-39
UTI: 4801-1705-25188/0-39;
Line no Melting temperature
  • defined value
  • experimental
  • at atmospheric pressure
  • property of pure substance
1 5 °C
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 1991
Title Empfohlene Sicherheitstechnische Kenngrößen
Database PTB
Publisher Datenbank PTB-AG 3.41/3.71
Language GERM
  • The oxidizing agent is air with an oxygen content of 20.95 % by volume. In the data base it is usually not specified as mixture component. Exceptions are highlighted.
  • Pressure values are absolute, not gauge pressures.
  • Impurities can strongly influence characteristic safety data, particulary if the properties of the impurity considerably deviate from the respective properties of the pure substance.
  • Safety characteristics are only displayed if evaluated data are available.
  • Values can be cited by using the UTI number of the table (Uniform Table Identifier).
  • Color Codes:         recommended value             no recommendation               do not use value

Flash point
1 1991 Physikalisch-Technische Bundesanstalt (PTB) 20 °C UTI: 4801-1705-25191/0-39
UTI: 4801-1705-25191/0-39;
Line no Flash point
  • recommended value
  • experimental
  • closed cup
  • property of pure substance
1 20 °C
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 1991
Title Empfohlene Sicherheitstechnische Kenngrößen
Database PTB
Publisher Datenbank PTB-AG 3.41/3.71
Language GERM
Stoichiometric fraction of combustible substance in mixture with air
1 2005 Physikalisch-Technische Bundesanstalt (PTB) 3.4 Mol% UTI: 220-1705-25186/0-39
UTI: 220-1705-25186/0-39;
Line no Stoichiometric fraction of combustible substance in mixture with air
  • recommended value
  • property of pure substance
1 3.4 Mol%
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 2005
Title Berechnete molare stöchiometrische Brenngasanteile in Luft (c_stoech)
Database PTB
Publisher Datenbank PTB-Lab. 3.43
Language GERM

No entry in database