IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail

 Important Notice Concerning COVID-19

Due to the rapid spread of COVID-19, and to ensure the health and safety of its employees and its entire network, the IRSST has implemented exceptional measures.
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On March 26, 2020, according to Decree 159-2020 published on March 11, 2020 in the Gazette officielle du Québec, the Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13) is amended in Appendix 1. These regulatory changes have not yet been incorporated into the current Substance Data Sheets of the Sampling Guide for Air Contaminants in the Workplace. An update is currently underway and will be available as soon as possible. Consequently, the information contained in the data sheets of substances modified or added in Decree 159-2020 is probably inaccurate or incomplete. Please contact our client service: [email protected] for further information.

Formic acid

French name in the regulation: Acide formique
CAS : 64-18-6
Synonyms: Hydrogen carboxylic acid

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 5 9,4 - -
STEV 10 19 - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer
Prohibited use Prohibited recirculation

TWA adjustment for unusual work schedules

1B : No adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Formic acid


Acide formique

Recommended method by the IRSST:
Method: NIOSH - 2011
Sampling device: PTFE filter with treated silica gel tube 400/200 mg
Flow rate: 0,05-0,2 L/min
TWA sampling volume: 24 L
STEL sampling volume: 3 L
Remarks: Contact the IRSST before sampling. The sample is stable for 1 week at 25°C.
Principle: Ion chromatography with conductivity detection (IC-CD)
NIOSH Manual of Analytical Methods, 4th ed., Method 2011 : Formic acid. NIOSH, 1994.