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

Methyl n-amyl ketone

French name in the regulation: Méthyl n-amyl cétone
CAS : 110-43-0
Synonyms: Heptanone-2; Methyl pentyl ketone

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 50 233 - -
STEV - - - -
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: Methyl n-amyl ketone


Méthyl n-amyl cétone

Method: IRSST - 316-1
Sampling device:
Sampling media required:
2120 Activated charcoal tube 100/50 mg

Flow rate: Max: 0,2 L/min
TWA sampling volume: 10 L
STEL sampling volume: -
Principle: Gas chromatography with flame ionization detection (GC-FID)
Precision (%): 8,1
Minimum reported value: 49 µg
Remarks: The analysis can be done by gas chromatography coupled with mass spectrometry (GC-MS, IRSST method #369); in this case the analytical uncertainty (CVa) is 6.3%.
IRSST. "Analyse de la Méthyl n-amylcétone dans l'air". Méthode 316-1. Méthode non publiée.
Following the amendment of Appendix 1 of the Quebec Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13), part of Quebec Occupational Health and Safety Act, which came into effect on March 26, 2020, the TWAEV, STEL and Ceiling values for certain substances are now expressed in ppm. For these substances, the IRSST performed the conversion calculations to express these TWAEV, TWA and Ceiling values in mg/m3, which thus appears in its Sampling Guide for Air Contaminants in the Workplace (Guide d'échantillonnage des contaminants de l'air en milieu de travail ) and the associated Substance Data Sheets. However, it is imperative to refer to the values expressed in the RSST which are legally binding.