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OHS Research
Research at the IRSST
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IRSST's Production
Magazine and Newsletter
Scientific Watch
Documentation Center
Useful Links
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Analysis and Testing Services
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Slip Resistance Test for Protective Footwear
Loan, Calibration and Repairs
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CQ Fibres
Quality Control of Fiber Counts
CQ Vrac
Recognized Laboratories
Interlaboratory quality
control program
Guides and Tools
Instruments and Sampling Material
Register
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Research Fund and Partnerships
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substance
September 01, 2025
Silica, Crystalline, Cristobalite (Pr)
French name in the regulation:
Silice cristalline, cristobalite (Pr)
CAS :
14464-46-1
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
-
0,05
-
Pr
STEV
-
-
-
-
Ceiling
-
-
-
-
Carcinogenicity
C2
Sensitizer
Simple asphyxiant
Percutaneous
Prohibited use
Prohibited recirculation
Minimum exposure
Explosion hazard
Ototoxic
TWA adjustment for unusual work schedules
III
: Weekly adjustment
CNESST – Toxicological Index Service
Consult REPTOX file:
Silica, Crystalline, Cristobalite(Pr)
Analysis:
Silice cristalline cristobalite par DRX
Method: IRSST - 206-2
Sampling protocol
Sampling device:
Sampling media required:
#IRSST
Description
902
Preweighed PVC filter, 37 mm, 5 µm
Parameters:
Flow rate: 1,7 (nylon) 2,75 (GS3) L/min
TWA sampling volume: 1000 L
STEL sampling volume: -
Remarks:
A cyclone is required for sampling. The GS3 cyclone must be used with #997 cassette. To obtain the crystalline silica content in percentage, a gravimetric analysis on the collected sample is also required.
Analytical protocol
Principle:
X-ray diffraction (XRD)
Precision (%):
7
Minimum reported value:
7 µg
Reference
IRSST. "Analyse du quartz, de cristobalite et de tridymite dans les poussières aéroportées". Méthode 206-2. Méthodes analytiques. Montréal: IRSST, 1995.
Silice cristalline cristobalite par DRX
Method: IRSST - 206-2
Sampling protocol
Sampling device:
Sampling media required:
#IRSST
Description
997
PVC filter, 37 mm 5 µm, preweighed, 3-part
Parameters:
Flow rate: 1,7 (nylon) 2,75 (GS3) L/min
TWA sampling volume: 1000 L
STEL sampling volume: -
Remarks:
A cyclone is required for sampling. The GS3 cyclone must be used with #997 cassette. To obtain the crystalline silica content in percentage, a gravimetric analysis on the collected sample is also required.
Analytical protocol
Principle:
X-ray diffraction (XRD)
Precision (%):
7
Minimum reported value:
7 µg
Reference
IRSST. "Analyse du quartz, de cristobalite et de tridymite dans les poussières aéroportées". Méthode 206-2. Méthodes analytiques. Montréal: IRSST, 1995.
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