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

substance

> > >

June 10, 2026

Fibres, Natural Mineral Fibres, Erionite

French name in the regulation: Fibres minérales naturelles Érionite

CAS : 66733-21-9

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	-	-	-	-
STEV	-	-	-	-
Ceiling	-	-	-	-

Carcinogenicity	C1	Sensitizer
Simple asphyxiant		Percutaneous
Prohibited use		Prohibited recirculation
Minimum exposure		Explosion hazard
Ototoxic

TWA adjustment for unusual work schedules

1A : No adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Fibres, Natural Mineral Fibres, Erionite

Analysis:

Identification de fibres

Method: IRSST - 244-3

Sampling protocol

Sampling device:
Parameters:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -

Analytical protocol

Principle: Polarized light microscopy (PLM)
Remarks: The use of this substance is prohibited. Caracterization of fibers in bulk samples or deposited dust is by method 244.

Reference

IRSST. "Caractérisation des fibres dans les poussières déposées ou dans les matériaux en vrac". Méthode 244-3.