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CAS Number: 75-56-9
Sum Formula: C3H6O
Molar Mass: 58.1 g/mol
German Synonyms: Propylenoxid | Propylenether | 1,2-Epoxypropan | Methyloxiran
English Synonyms: Propylene oxide | Methyloxirane
EC Index Number: 603-055-00-4
EC Number: 200-879-2
Temperature Class: T2
Explosion Group: IIB
Structural Formula Methyloxirane

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. 1: flammable liquids, category 1
  • Carc. 1B: carcinogenicity, category 1B
  • Muta. 1B: germ cell mutagenicity, category 1B
  • Acute Tox. 4: acute oral toxicity, category 4
  • Acute Tox. 4: acute dermal toxicity, category 4
  • Acute Tox. 4: acute toxicity by inhalation, category 4
  • Eye Irrit. 2: eye irritation, category 2
  • STOT SE 3: Specific target organ toxicity following single exposure, category 3, respiratory tract irritation or narcotic effects
  • Skin Irrit. 2: skin irritation, category 2
GHS Pictogram:
pictogram flammable
pictogram health hazard
pictogram harmful





GHS Signal Word: Danger
GHS Hazard Statement:
  • H224: Extremely flammable liquid and vapour.
  • H350: May cause cancer .
  • H340: May cause genetic defects .
  • H332: Harmful if inhaled.
  • H312: Harmful in contact with skin.
  • H302: Harmful if swallowed.
  • H319: Causes serious eye irritation.
  • H335: May cause respiratory irritation.
  • H315: Causes skin irritation.

Antoine parameters
1 DECHEMA 7.01443 Torr UTI: 1100-1156-18630/0-39
UTI: 1100-1156-18630/0-39;
Line no Upper temperature limit of Antoine equation Lower temperature limit of Antoine equation Antoine constant C Antoine constant B Antoine constant A
  • recommended value
  • saturated
  • property of pure substance
  • recommended value
  • saturated
  • property of pure substance
  • recommended value
  • by regression
  • saturated
  • property of pure substance
  • recommended value
  • by regression
  • saturated
  • property of pure substance
  • defined value
  • by regression
  • saturated
  • property of pure substance
1 < 115 °C > -19 °C 228.594 °C 1086.369 °C 7.01443 Torr
Bibliographic data
Author DECHEMA
Title Antoinekonstanten
Database PTB
Publisher Detherm
Boiling point
1 1963 Nabert, K.; Schön, G. 1013.25 hPa 34 °C UTI: 1000-1156-18620/0-39
UTI: 1000-1156-18620/0-39;
Line no Boiling temperature Pressure
  • defined value
  • at atmospheric pressure
  • property of pure substance
1 34 °C 1013.25 hPa
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Density
1 1963 Nabert, K.; Schön, G. 1013.25 hPa 20 °C 0.83 g/cm3 UTI: 1000-1156-18621/0-39
UTI: 1000-1156-18621/0-39;
Line no Density Temperature Pressure
  • defined value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
  • property of pure substance
  • recommended value
  • at atmospheric pressure and room temperature
1 0.83 g/cm3 20 °C 1013.25 hPa
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Melting point
1 1963 Nabert, K.; Schön, G. 1013.25 hPa -112 °C UTI: 1000-1156-18625/0-39
UTI: 1000-1156-18625/0-39;
Line no Melting temperature Pressure
  • defined value
  • at atmospheric pressure
  • saturated
  • property of pure substance
  • recommended value
  • at atmospheric pressure
  • saturated
1 -112 °C 1013.25 hPa
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Relative gas density
1 1963 Nabert, K.; Schön, G. 2 UTI: 1000-1156-18622/0-39
UTI: 1000-1156-18622/0-39;
Line no Relative gas density
  • defined value
  • property of pure substance
1 2
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Solubility in water
1 2009 Physikalisch-Technische Bundesanstalt (PTB) 20 °C 681 g/l UTI: 228-1156-18616/0-39
UTI: 228-1156-18616/0-39;
Line no Solubility in water Temperature
  • defined value
  • property of pure substance
  • property of pure substance
1 681 g/l 20 °C
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 2009
Title Wasserlöslichkeit
Database PTB
Publisher Datenbank PTB-Lab. 3.43
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

Autoignition Temperature
1 1963 Nabert, K.; Schön, G. 430 °C UTI: 1000-1156-18623/0-39
UTI: 1000-1156-18623/0-39;
Line no Autoignition Temperature
  • recommended value
  • according to german standard
  • property of pure substance
1 430 °C [A]
[A] DIN 51794: Testing of mineral oil hydrocarbons - Determination of ignition temperature; measurements are technically identical to those of ISO/IEC 80079-20-1 but results are treated differently.
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Flash point
1 1963 Nabert, K.; Schön, G. < -20 °C UTI: 1000-1156-18618/0-39
UTI: 1000-1156-18618/0-39;
Line no Flash point
  • recommended value
  • experimental
  • closed cup
  • property of pure substance
1 < -20 °C
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Limiting value for flammability (Tci)
1 2008 Physikalisch-Technische Bundesanstalt (PTB) 3.7 Mol% UTI: 232-1156-18617/0-39
UTI: 232-1156-18617/0-39;
Line no Limiting value for flammability (Tci)
  • recommended value
  • property of pure substance
1 3.7 Mol%
Bibliographic data
Author Physikalisch-Technische Bundesanstalt (PTB)
Year 2008
Title Draft for the revision of ISO 10156 'Gas cylinders - Gas and gas mixture - Determination of fire potential and oxidizing ability'
Database PTB
Publisher Datenbank PTB-Lab. 3.43
Language ENGL
Explosion limits
Lower explosion limit
1 1963 Nabert, K.; Schön, G. 1.9 Vol% ± 10 % UTI: 1000-1156-18627/0-39
UTI: 1000-1156-18627/0-39;
Line no Lower explosion limit
  • recommended value
  • property of pure substance
1 1.9 Vol% ± 10 %
2 45 g/m3 ± 10 % ⚠
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Upper explosion limit
1 2003 38.8 Vol% UTI: 213-1156-18597/0-39
UTI: 213-1156-18597/0-39;
Line no Upper explosion limit
  • recommended value
  • experimental
  • property of pure substance
1 38.8 Vol%
2 938 g/m3 ⚠
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Title Messungen BAM-Labor II.12
Year 2003
Publisher BAM-Labor II.12
Language GERM
2 1963 Nabert, K.; Schön, G. 15 Vol% ... 24 Vol% ± 5 % UTI: 1000-1156-18626/0-39
UTI: 1000-1156-18626/0-39;
Line no Upper explosion limit
  • property of pure substance
1 15 Vol% ± 5 %
2 24 Vol% ± 5 % [1]
3 360 g/m3 ± 5 % ⚠
4 580 g/m3 ± 5 % [1] ⚠
[1] at higher ignition energy
⚠ The reference for the specification in g/m3 is the molar volume at 20 °C
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Lower explosion point
1 1986 Yagyu, S. -44 °C UTI: 200-1156-18595/0-39
UTI: 200-1156-18595/0-39;
Line no Lower explosion point
  • experimental
  • property of pure substance
1 -44 °C
Bibliographic data
Title Diagrams Related to Flashing Temperatures and Flammability Limits
Author Yagyu, S.
Year 1986
Journal Title Safety Document of the Research Institute of Indus
Volume 25
Publisher RIIS
Language JAPN
Maximum experimental safe gap
1 1992 Nabert, K.; Schön, G.; Redeker, T. 0.7 mm UTI: 1050-1156-18629/0-39
UTI: 1050-1156-18629/0-39;
Line no Maximum experimental safe gap
  • recommended value
  • property of pure substance
1 0.7 mm
Bibliographic data
Author Nabert, K.; Schön, G.; Redeker, T.
Year 1992
Title Sicherheitstechnische Kenngrößen brennbarer Gase und Dämpfe
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Language GERM
Maximum explosion pressure
1 1963 Nabert, K.; Schön, G. 9.1 bar UTI: 1000-1156-18624/0-39
UTI: 1000-1156-18624/0-39;
Line no Maximum explosion pressure
  • recommended value
  • experimental
  • property of pure substance
1 9.1 bar
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1963
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe (mit 6. Nachtrag)
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Abstract English Safety values of about 1000 flammable gases and vapors: Explosion limits, ignition temperatures, flash points, explosion pressures.
Language GERM
Minimum ignition energy
1 1990 Nabert, K.; Schön, G. 0.13 mJ UTI: 1011-1156-18628/0-39
UTI: 1011-1156-18628/0-39;
Line no Minimum ignition energy
  • recommended value
  • property of pure substance
1 0.13 mJ [1]
[1] most ignitable mixture 7.5 Vol%
Bibliographic data
Author Nabert, K.; Schön, G.
Year 1990
Title Sicherheitstechnische Kennzahlen brennbarer Gase und Dämpfe
Pages 6
Publisher Deutscher Eichverlag
Publisher City Braunschweig
Language GERM
Stoichiometric fraction of combustible substance in mixture with air
1 2005 Physikalisch-Technische Bundesanstalt (PTB) 5.0 Mol% UTI: 220-1156-18615/0-39
UTI: 220-1156-18615/0-39;
Line no Stoichiometric fraction of combustible substance in mixture with air
  • recommended value
  • property of pure substance
1 5.0 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) 20 Mol% UTI: 219-1156-18614/0-39
UTI: 219-1156-18614/0-39;
Line no Stoichiometric fraction of combustible substance in mixture with oxygen
  • recommended value
  • property of pure substance
1 20 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

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