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CAS Number: 623-43-8
Sum Formula: C5H8O2
Molar Mass: 100.1 g/mol
German Synonyms: (2E)-2-Butensäuremethylester | trans-2-Butensäuremethylester | Methylcrotonat | Methyl-trans-crotonat
English Synonyms: (2E)-2-Butenoic acid methyl ester | Methyl (E)-but-2-enoate | trans-2-Butenoic acid methyl ester
EC Number: 210-793-7
Structural Formula (2E)-2-Butenoic acid methyl ester

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 )

Boiling point
1 1991 Physikalisch-Technische Bundesanstalt (PTB) 1013.25 hPa 121 °C UTI: 4801-3759-39171/0-39
UTI: 4801-3759-39171/0-39;
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 0.94 g/cm3 UTI: 4801-3759-39172/0-39
UTI: 4801-3759-39172/0-39;
Line no Density Temperature Pressure
  • defined value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • property of pure substance
1 0.94 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 1991 Physikalisch-Technische Bundesanstalt (PTB) -42 °C UTI: 4801-3759-39170/0-39
UTI: 4801-3759-39170/0-39;
Line no Melting temperature
  • defined value
  • experimental
  • at atmospheric pressure
  • property of pure substance
1 -42 °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 2011 Physikalisch-Technische Bundesanstalt (PTB) 25 °C UTI: 4031-3759-39168/0-39
UTI: 4031-3759-39168/0-39;
Line no Flash point
  • recommended value
  • experimental
  • closed cup
  • property of pure substance
1 25 °C
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 2011
Title Sicherheitstechnische Kenngrößen: Messwerte 2011 des PTB-Laboratoriums 3.41
Database PTB
Publisher PTB-Lab. 3.41
Language GERM
Stoichiometric fraction of combustible substance in mixture with air
1 2005 Physikalisch-Technische Bundesanstalt (PTB) 3.4 Mol% UTI: 220-3759-39167/0-39
UTI: 220-3759-39167/0-39;
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
Stoichiometric fraction of combustible substance in mixture with oxygen
1 2005 Physikalisch-Technische Bundesanstalt (PTB) 14.3 Mol% UTI: 219-3759-39166/0-39
UTI: 219-3759-39166/0-39;
Line no Stoichiometric fraction of combustible substance in mixture with oxygen
  • recommended value
  • property of pure substance
1 14.3 Mol%
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 2005
Title Berechnete molare stöchiometrische Brenngasanteile in Sauerstoff
Database PTB
Publisher Datenbank PTB-Lab. 3.43
Language GERM

No entry in database