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CAS Number: 624-64-6
Sum Formula: C4H8
German Synonyms: trans-1,2-Dimethylaethen | trans-1,2-Dimethylethen | trans-1,2-Dimethylaethylen | trans-1,2-Dimethylethylen | trans-Butylen-2 | trans-Buten-2 | (E)-2-Butylen | trans-2-Butylen | trans-2-Buten | (E)-2-Buten
English Synonyms: trans-Butylene-2 | trans-Butene-2 | trans-1,2-Dimethylethylene | trans-1,2-Dimethylethene | trans-2-Butylene | trans-2-Butene | (E)-2-Butene
EC Index Number: 601-012-00-4
EC Number: 210-855-3
Properties: flammable, gas
Temperature Class: T2
Explosion Group: IIA
Structural Formula (E)-2-Butene

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. Gas 1: flammable gases, category 1
  • Press. Gas: Compressed gases
GHS Pictogram:
pictogram flammable
pictogram compressed gas





GHS Signal Word: Danger
GHS Hazard Statement:
  • H220: Extremely flammable gas.

Boiling point
1 1991 Redeker, T.; Schön, G. 1 °C UTI: 8000-001-001/20240215
UTI: 8000-001-001/20240215;
Line no Boiling temperature
  • defined value
  • at atmospheric pressure
  • property of pure substance
1 1 °C
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Redeker, T.; Schön, G.
Year 1991
Title German Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
ISBN / ISSN 3-8064-9936-5
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
Critical density
1 Critical Data 2016 BAM 0.238 g/cm3 UTI: 5000-028-003/20111005
Critical Data
UTI: 5000-028-003/20111005;
Line no Critical temperature Critical pressure Critical density
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
1 155.5 °C 4100 kPa 0.238 g/cm3
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM
Critical point
1 1991 Redeker, T.; Schön, G. 155 °C UTI: 8000-002-001/20240215
UTI: 8000-002-001/20240215;
Line no Critical temperature
  • defined value
  • property of pure substance
1 155 °C
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Redeker, T.; Schön, G.
Year 1991
Title German Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
ISBN / ISSN 3-8064-9936-5
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
2 Critical Data 2016 BAM 155.5 °C UTI: 5000-028-003/20111005
Critical Data
UTI: 5000-028-003/20111005;
Line no Critical temperature Critical pressure Critical density
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
1 155.5 °C 4100 kPa 0.238 g/cm3
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM
Density
1 2003 BAM 101.3 kPa 0 °C 2.582 kg/m3 UTI: 5560-015-001/20111005
UTI: 5560-015-001/20111005;
Line no Temperature Pressure Density
  • Parameter of the measurement
  • property of pure substance
  • Parameter of the measurement
  • property of pure substance
  • defined value
  • property of pure substance
1 0 °C 101.3 kPa 2.582 kg/m3
Bibliographic data
Year 2003
Title Gasatlas
Database BAM
Language GERM
2 2016 BAM 101.3 kPa 0 °C 2.582 kg/m3 UTI: 5016-000-001/20111005
UTI: 5016-000-001/20111005;
Line no Temperature Pressure Density
  • Parameter of the measurement
  • property of pure substance
  • Parameter of the measurement
  • property of pure substance
  • defined value
  • property of pure substance
1 0 °C 101.3 kPa 2.582 kg/m3
Bibliographic data
Year 2016
Title Recommended Densities of Pure Gases
Database BAM
Language GERM
Molar mass
1 1991 Redeker, T.; Schön, G. 56.1 g/mol UTI: 8000-004-001/20240215
UTI: 8000-004-001/20240215;
Line no Molar mass
  • defined value
  • property of pure substance
1 56.1 g/mol
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Redeker, T.; Schön, G.
Year 1991
Title German Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
ISBN / ISSN 3-8064-9936-5
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
Relative gas density
1 1991 Redeker, T.; Schön, G. 1.94 UTI: 8000-003-001/20240215
UTI: 8000-003-001/20240215;
Line no Relative gas density
  • defined value
  • property of pure substance
1 1.94
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Redeker, T.; Schön, G.
Year 1991
Title German Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
ISBN / ISSN 3-8064-9936-5
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
2 2006 2 UTI: 5594-009-001/20111005
UTI: 5594-009-001/20111005;
Line no Relative gas density
  • defined value
  • property of pure substance
1 2
Bibliographic data
Year 2006
Title DIN EN ISO 14912 Gas analysis - Conversion of gas mixture composition data (ISO 14912 :2003) German version EN ISO 14912:2006
Institution DIN,Deutsches Institut für Normung e.V.
Language ENGL
  • 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

Autoignition Temperature
1 1984 324 °C UTI: 5541-002-001/20111005
UTI: 5541-002-001/20111005;
Line no Autoignition Temperature
  • property of pure substance
1 324 °C
Bibliographic data
Title Fire Hazard Properties of Flammable Liquids, Gases, and Volatile Solids Table
Year 1984
Publisher National Fire Protection Association
Publisher City Quincy, MA
Pages 9-95
96
Language ENGL
Limiting value for flammability (Tci)
1 2016 BAM 3.3 Mol% UTI: 5009-041-001/20111005
UTI: 5009-041-001/20111005;
Line no Limiting value for flammability (Tci)
  • recommended value
  • EU-standard
  • property of pure substance
1 3.3 Mol%
Bibliographic data
Year 2016
Title Recommended Tci values of Gases for Determination of fire potential for the selection of cylinder valve outlets 4.6 Calculation method: ISO 10156:2008 (E) - Draft
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language ENGL
2 2008 3.3 Mol% UTI: 5537-041-001/20111005
UTI: 5537-041-001/20111005;
Line no Limiting value for flammability (Tci)
  • recommended value
  • EU-standard
  • property of pure substance
1 3.3 Mol%
Bibliographic data
Year 2008
Title Draft for the revision of ISO 10156 "Gas cylinders – Gas and gas mixture – Determination of fire potential and oxidizing ability"
Subtitle Table 2 —Tci and Li values of flammable gases and vapours
Publisher ISO
Institution ISO - International Organization for Standardization
Language ENGL
Explosion limits
Lower explosion limit
1 2016 BAM 1.6 Vol% UTI: 5000-028-001/20111005
UTI: 5000-028-001/20111005;
Line no Lower explosion limit Upper explosion limit Stoichiometric fraction of combustible substance in mixture with air Stoichiometric fraction of combustible substance in mixture with oxygen Maximum experimental safe gap
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • recommended value
  • property of pure substance
1 1.6 Vol% 10 Vol% 3.4 Mol% 14.3 Mol% 0.93 mm
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM
2 1990 Nabert, K.; Schön, G. 37 g/m3 ± 10 % UTI: 5510-014-001/20111005
UTI: 5510-014-001/20111005;
Line no Lower explosion limit Lower explosion limit Upper explosion limit Upper explosion limit
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
1 37 g/m3 ± 10 % ⚠ 1.6 Vol% ± 10 % 235 g/m3 ± 5 % ⚠ 10 Vol% ± 5 %
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Nabert, K.; Schön, G.
Year 1990
Publisher Deutscher Eichverlag;Braunschweig (Pub.)
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
3 1990 Nabert, K.; Schön, G. 1.6 Vol% ± 10 % UTI: 5510-014-001/20111005
UTI: 5510-014-001/20111005;
Line no Lower explosion limit Lower explosion limit Upper explosion limit Upper explosion limit
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
1 37 g/m3 ± 10 % ⚠ 1.6 Vol% ± 10 % 235 g/m3 ± 5 % ⚠ 10 Vol% ± 5 %
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Nabert, K.; Schön, G.
Year 1990
Publisher Deutscher Eichverlag;Braunschweig (Pub.)
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
Upper explosion limit
1 2016 BAM 10 Vol% UTI: 5000-028-001/20111005
UTI: 5000-028-001/20111005;
Line no Lower explosion limit Upper explosion limit Stoichiometric fraction of combustible substance in mixture with air Stoichiometric fraction of combustible substance in mixture with oxygen Maximum experimental safe gap
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • recommended value
  • property of pure substance
1 1.6 Vol% 10 Vol% 3.4 Mol% 14.3 Mol% 0.93 mm
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM
2 1990 Nabert, K.; Schön, G. 235 g/m3 ± 5 % UTI: 5510-014-001/20111005
UTI: 5510-014-001/20111005;
Line no Lower explosion limit Lower explosion limit Upper explosion limit Upper explosion limit
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
1 37 g/m3 ± 10 % ⚠ 1.6 Vol% ± 10 % 235 g/m3 ± 5 % ⚠ 10 Vol% ± 5 %
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Nabert, K.; Schön, G.
Year 1990
Publisher Deutscher Eichverlag;Braunschweig (Pub.)
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
3 1990 Nabert, K.; Schön, G. 10 Vol% ± 5 % UTI: 5510-014-001/20111005
UTI: 5510-014-001/20111005;
Line no Lower explosion limit Lower explosion limit Upper explosion limit Upper explosion limit
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
  • at atmospheric pressure and room temperature
  • according to german standard
  • property of pure substance
  • according to german standard
  • property of pure substance
1 37 g/m3 ± 10 % ⚠ 1.6 Vol% ± 10 % 235 g/m3 ± 5 % ⚠ 10 Vol% ± 5 %
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (with 6. Supplement)
Author Nabert, K.; Schön, G.
Year 1990
Publisher Deutscher Eichverlag;Braunschweig (Pub.)
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Abstract German Sicherheitstechnische Kenngrößen von ca. 1000 Gasen und Dämpfen: Explosionsgrenzen, Zündtemperaturen, Flammpunkte, Explosionsdrücke.
Language GERM
Maximum experimental safe gap
1 2016 BAM 0.93 mm UTI: 5000-028-001/20111005
UTI: 5000-028-001/20111005;
Line no Lower explosion limit Upper explosion limit Stoichiometric fraction of combustible substance in mixture with air Stoichiometric fraction of combustible substance in mixture with oxygen Maximum experimental safe gap
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • recommended value
  • property of pure substance
1 1.6 Vol% 10 Vol% 3.4 Mol% 14.3 Mol% 0.93 mm
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM
Stoichiometric fraction of combustible substance in mixture with air
1 2016 BAM 3.4 Mol% UTI: 5000-028-001/20111005
UTI: 5000-028-001/20111005;
Line no Lower explosion limit Upper explosion limit Stoichiometric fraction of combustible substance in mixture with air Stoichiometric fraction of combustible substance in mixture with oxygen Maximum experimental safe gap
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • recommended value
  • property of pure substance
1 1.6 Vol% 10 Vol% 3.4 Mol% 14.3 Mol% 0.93 mm
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM
Stoichiometric fraction of combustible substance in mixture with oxygen
1 2016 BAM 14.3 Mol% UTI: 5000-028-001/20111005
UTI: 5000-028-001/20111005;
Line no Lower explosion limit Upper explosion limit Stoichiometric fraction of combustible substance in mixture with air Stoichiometric fraction of combustible substance in mixture with oxygen Maximum experimental safe gap
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • defined value
  • property of pure substance
  • defined value
  • property of pure substance
  • recommended value
  • property of pure substance
1 1.6 Vol% 10 Vol% 3.4 Mol% 14.3 Mol% 0.93 mm
Bibliographic data
Year 2016
Title Recommended Safety Characteristics and Classifications of Flammable Gases and Gas Mixtures
Database BAM
Publisher Datenbank BAM-Projekt CHEMSAFE
Language GERM

No entry in database