WHMIS (Methacrylic acid)

Workplace Hazardous Materials Information System

WHMIS 2015 classification - Note to reader
Update: 2016-03-15

  • Flammable liquids - Category 41
    • Flash point = 67 °C closed cup (non reported method)
  • Acute toxicity - oral - Category 42
  • Acute toxicity - dermal - Category 32
  • Acute toxicity - inhalation - Category 32
  • Skin corrosion/irritation - Category 1A 3
  • Serious eye damage/eye irritation - Category 13 4
  • Health hazards not otherwise classified (corrosion) - Category 14

  • WHMIS 2015 pictogram : Skull and crossbones

  • WHMIS 2015 pictogram : Corrosion


Combustible liquid (H227)
Harmful if swallowed (H302)
Toxic in contact with skin (H311)
Toxic if inhaled (H331)
Causes severe skin burns and eye damage (H314)
Causes severe damage to the respiratory tract

Ingredient disclosure

Comments5 6 : This product is generally commercialized with an inhibitor. Therefore, the health hazard classification could be different, according to the inhibitor used and its concentration. The physical hazard classification considers the product as inhibited. However, under certain conditions (e.g. depletion or absence of the inhibitor) a hazardous polymerisation may occur.


  • ▲1.  National Fire Protection Association, Fire protection guide to hazardous materials. 13th ed. Quincy, Mass. : NFPA. (2002). [RR-334001]
  • ▲2.  Bureau européen des substances chimiques, European Union Risk Assessment Report : Methacrylic acid. 1st Priority List, Vol. 25. Luxembourg : Office for Official Publications of the European Communities. (2002). EUR 19837 EN.   https://echa.europa.eu/documents/10162/f0b94b4b-a87b-442b-b647-8ff56895c92c
  • ▲3.  Centre canadien d'hygiène et de sécurité au travail, CHEMINFO, Hamilton, Ont. : Canadian Centre for Occupational Health and Safety   http://ccinfoweb.ccohs.ca/cheminfo/search.html
  • ▲4.  OECD, «OECD Screening Information Data Set (SIDS) for High Production Volume Chemicals.» In: Methacrylic acid CAS N°: 79-41-4. Paris : UNEP publication. (2001).   http://www.inchem.org/documents/sids/sids/79414.pdf
  • ▲5.  Urben, P. G. et Pitt, M.J., Bretherick's handbook of reactive chemical hazards. Vol. 1, 7th ed. Oxford; Toronto : Elsevier. (2007). [RS-415001]
  • ▲6.  National Fire Protection Association, Fire protection guide to hazardous materials. 14th ed. Quincy, Mass. : NFPA. (2010). [RR-334001]

The [number] refers to the Information SST database of the CNESST Documentation Center.