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CAS Number: 123-54-6
Sum Formula: C5H8O2
Molar Mass: 100.1 g/mol
German Synonyms: Diacetylmethan | Acetylaceton | 2,4-Pentandion
English Synonyms: Pentane-2,4-dione | 2,4-Pentanedione
EC Index Number: 606-029-00-0
EC Number: 204-634-0
Temperature Class: T2
Explosion Group: IIA
Structural Formula 2,4-Pentanedione

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. 3: flammable liquids, category 3
  • Acute Tox. 4: acute oral toxicity, category 4
GHS Pictogram:
pictogram flammable
pictogram harmful





GHS Signal Word: Warning
GHS Hazard Statement:
  • H226: Flammable liquid and vapour.
  • H302: Harmful if swallowed.

Antoine parameters
1 1987 Stephenson, R.M.; Malanowski, S. 5.98985 kPa UTI: 137-506-488/0-39
UTI: 137-506-488/0-39;
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 < 378 K > 288 K -64.8 K 1377.34 K 5.98985 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 1963 Nabert, K.; Schön, G. 1013.25 hPa 140 °C UTI: 1000-506-506/0-39
UTI: 1000-506-506/0-39;
Line no Boiling temperature Pressure
  • defined value
  • at atmospheric pressure
  • property of pure substance
1 ca. 140 °C ca. 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 0.98 g/cm3 UTI: 1000-506-507/0-39
UTI: 1000-506-507/0-39;
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 0.98 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 -23 °C UTI: 1000-506-510/0-39
UTI: 1000-506-510/0-39;
Line no Melting temperature Pressure
  • defined value
  • at atmospheric pressure
  • saturated
  • property of pure substance
  • recommended value
  • at atmospheric pressure
  • saturated
1 -23 °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. 3.45 UTI: 1000-506-508/0-39
UTI: 1000-506-508/0-39;
Line no Relative gas density
  • defined value
  • property of pure substance
1 3.45
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 122 g/l UTI: 228-506-503/0-39
UTI: 228-506-503/0-39;
Line no Solubility in water Temperature
  • defined value
  • property of pure substance
  • property of pure substance
1 122 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. 340 °C UTI: 1000-506-509/0-39
UTI: 1000-506-509/0-39;
Line no Autoignition Temperature
  • recommended value
  • according to german standard
  • property of pure substance
1 340 °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
2 1954 Zabetakis, M.G.; Furno, A.L.; Jones,G.W. 340 °C UTI: 69-506-486/0-39
UTI: 69-506-486/0-39;
Line no Autoignition Temperature
  • methode not internationally standardized
  • property of pure substance
1 340 °C
Bibliographic data
Title Minimum Spontaneous Ignition Temperatures of Combustibles in Air
Author Zabetakis, M.G.; Furno, A.L.; Jones,G.W.
Year 1954
Journal Title Ind. Eng. Chem.
Volume 46
Pages 2173-2178
Publisher Ind. Eng. Chem.
Language ENGL
Flash point
1 1963 Nabert, K.; Schön, G. 34 °C UTI: 1000-506-504/0-39
UTI: 1000-506-504/0-39;
Line no Flash point
  • recommended value
  • experimental
  • closed cup
  • property of pure substance
1 34 °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
2 2011 Physikalisch-Technische Bundesanstalt (PTB) 32.5 °C ... 34 °C UTI: 4031-506-513/0-39
UTI: 4031-506-513/0-39;
Line no Flash point
  • experimental
  • closed cup
  • property of pure substance
1 32.5 °C [A]
2 34 °C [A]
[A] DIN EN ISO 3679: Determination of flash point - Method for flash no-flash and flash point by small scale closed cup tester; German version of EN ISO 3679:2022
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
Lower explosion limit
1 1991 Physikalisch-Technische Bundesanstalt (PTB) 1.7 Vol% ± 10 % UTI: 4801-506-514/0-39
UTI: 4801-506-514/0-39;
Line no Lower explosion limit
  • recommended value
  • experimental
  • property of pure substance
1 1.7 Vol% ± 10 % [1]
2 71 g/m3 ± 10 % [1] ⚠
[1] in accordance with calculated lower explosion point
⚠ The reference for the specification in g/m3 is the molar volume at 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
Maximum experimental safe gap
1 1992 Nabert, K.; Schön, G.; Redeker, T. 0.92 mm UTI: 1050-506-511/0-39
UTI: 1050-506-511/0-39;
Line no Maximum experimental safe gap
  • recommended value
  • property of pure substance
1 0.92 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
Stoichiometric fraction of combustible substance in mixture with air
1 2005 Physikalisch-Technische Bundesanstalt (PTB) 3.4 Mol% UTI: 220-506-502/0-39
UTI: 220-506-502/0-39;
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: 219-506-501/0-39
UTI: 219-506-501/0-39;
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

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