Silicon tetrahydride

According to Decree 280-2024 published on February 28, 2024, in the Gazette officielle du Québec, the amendment to the Appendix 1 of the Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13) will come into force on March 14, 2024. 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 280-2024 is partially inaccurate or incomplete. Please consult our infoLABO (in French only) for more details. Please contact our client service: [email protected] for further information.

Silicon tetrahydride

French name in the regulation: Silicium, tétrahydrure de

CAS : 7803-62-5

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	5	6,6	-	-
STEV	-	-	-	-
Ceiling	-	-	-	-

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

TWA adjustment for unusual work schedules

II : Daily adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Silicon tetrahydride

Analysis:

Silicium, tétrahydrure de

Recommended method by the IRSST:

Method: OSHA - IMIS2237

Sampling protocol

Sampling device: Glass fritted tip impinger containing 15 mL of potassium hydroxide
Parameters:
Flow rate: 1 L/min
TWA sampling volume: 480 L
STEL sampling volume: -
Remarks: The samples must be stored in plastic containers and shipped as soon as possible. Contact the IRSST before sampling.

Analytical protocol

Principle: Inductively coupled plasma-optical emission spectrometer (ICP-OES)
Remarks: OSHA method ID-125G is for total silicon and can be adapted to this product.

Reference

OSHA, Chemical Information Manual. IMIS2237: Silicon Tetrahydride, 1993.