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CAS Number: 79-41-4
Sum Formula: C4H6O2
Molar Mass: 86.1 g/mol
German Synonyms: Methacrylsäure | 2-Methyl-2-propensäure
English Synonyms: Methacrylic acid | 2-Methyl-2-propenoic acid
EC Index Number: 607-088-00-5
EC Number: 201-204-4
Temperature Class: T2
Structural Formula 2-Methyl-2-propenoic acid

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:
  • Acute Tox. 4: acute dermal toxicity, category 4
  • Acute Tox. 4: acute oral toxicity, category 4
  • Skin Corr. 1A: skin corrosion, category 1A
GHS Pictogram:
pictogram corrosive
pictogram harmful





GHS Signal Word: Danger
GHS Hazard Statement:
  • H312: Harmful in contact with skin.
  • H302: Harmful if swallowed.
  • H314: Causes severe skin burns and eye damage.

Antoine parameters
1 1987 Stephenson, R.M.; Malanowski, S. 8.10127 kPa UTI: 137-972-13674/0-39
UTI: 137-972-13674/0-39;
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 < 434 K > 298 K -4.216 K 2621.47 K 8.10127 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 161 °C UTI: 1000-972-13685/0-39
UTI: 1000-972-13685/0-39;
Line no Boiling temperature Pressure
  • defined value
  • at atmospheric pressure
  • property of pure substance
1 161 °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 1.02 g/cm3 UTI: 1000-972-13686/0-39
UTI: 1000-972-13686/0-39;
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 1.02 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 15 °C UTI: 1000-972-13688/0-39
UTI: 1000-972-13688/0-39;
Line no Melting temperature Pressure
  • defined value
  • at atmospheric pressure
  • saturated
  • property of pure substance
  • recommended value
  • at atmospheric pressure
  • saturated
1 15 °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. 2.97 UTI: 1000-972-13687/0-39
UTI: 1000-972-13687/0-39;
Line no Relative gas density
  • defined value
  • property of pure substance
1 2.97
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) 17 °C > 0.1 g/l UTI: 228-972-13682/0-39
UTI: 228-972-13682/0-39;
Line no Solubility in water Temperature
  • defined value
  • property of pure substance
  • property of pure substance
1 > 0.1 g/l 17 °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 1991 Physikalisch-Technische Bundesanstalt (PTB) 385 °C UTI: 4801-972-13690/0-39
UTI: 4801-972-13690/0-39;
Line no Autoignition Temperature
  • recommended value
  • experimental
  • international standard method
  • property of pure substance
1 385 °C [A]
[A] IEC 79-4: Method of Test for Ignition Temperature, Electrical Apparatus for Explosive G; Replaced by IEC-60079-20-1 in 1975
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
2 1975 Yagyu, S. 385 °C UTI: 179-972-13678/0-39
UTI: 179-972-13678/0-39;
Line no Autoignition Temperature
  • experimental
  • international standard method
  • property of pure substance
1 385 °C [A]
[A] IEC 79-4: Method of Test for Ignition Temperature, Electrical Apparatus for Explosive G; Replaced by IEC-60079-20-1 in 1975
Bibliographic data
Title Data for Ignition Temperature(1st and 2nd)
Author Yagyu, S.
Year 1975
Publisher RIIS
Language JAPN
Flash point
1 1963 Nabert, K.; Schön, G. 68 °C UTI: 1000-972-13683/0-39
UTI: 1000-972-13683/0-39;
Line no Flash point
  • recommended value
  • experimental
  • closed cup
  • property of pure substance
1 68 °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 limit
1 1991 Physikalisch-Technische Bundesanstalt (PTB) 2.1 Vol% ± 10 % UTI: 4801-972-13691/0-39
UTI: 4801-972-13691/0-39;
Line no Lower explosion limit
  • recommended value
  • estimated
  • property of pure substance
1 2.1 Vol% ± 10 % [1]
2 75 g/m3 ± 10 % [1] ⚠
[1] estimated at T=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
Stoichiometric fraction of combustible substance in mixture with air
1 2005 Physikalisch-Technische Bundesanstalt (PTB) 4.4 Mol% UTI: 220-972-13681/0-39
UTI: 220-972-13681/0-39;
Line no Stoichiometric fraction of combustible substance in mixture with air
  • recommended value
  • property of pure substance
1 4.4 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

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