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

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.


French name in the regulation: Pentaborane
CAS : 19624-22-7

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 0,005 0,013 - -
STEV 0,015 0,039 - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer
Prohibited use Prohibited recirculation

TWA adjustment for unusual work schedules

II : Daily adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Pentaborane



Recommended method by the IRSST:
Method: OSHA - ID125G
Sampling device: Glass fritted tip impinger containing deionized water
Flow rate: 1 L/min
TWA sampling volume: 480 L
STEL sampling volume: 15 L
Remarks: This substance is not analyzed by our laboratories. It might be possible that the analysis be performed by another laboratory. Please contact the IRSST before sampling.
Principle: Inductively coupled plasma spectrometry (ICP)
Remarks: OSHA method ID-125G is for metallic elements and compounds and can be adapted to pentaborane. The device and the parameters on OSHA data sheet IMIS1986 are used.
OSHA Analytical Methods Manual, Method ID125G.: Metal particulates in workplace atmospheres (ICP analysis), 2002.