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/m³	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) 2 (PPI) L/min
TWA sampling volume: 800 L
STEL sampling volume: -
Remarks: For sampling, the use of a particle selector is required. One commonly used selector is the cyclone. The GS3 cyclone must be used with #997 cassette. As an alternative to the cyclone, the parallel particle impactor (PPI) can also be used at a flow rate of 2 L/min, with cassette 940. 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 (%): 8
Minimum reported value: 8 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) 2 (PPI) L/min
TWA sampling volume: 800 L
STEL sampling volume: -
Remarks: For sampling, the use of a particle selector is required. One commonly used selector is the cyclone. The GS3 cyclone must be used with #997 cassette. As an alternative to the cyclone, the parallel particle impactor (PPI) can also be used at a flow rate of 2 L/min, with cassette 940. 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 (%): 8
Minimum reported value: 8 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
940	Respirable impactor (PPI) 2L/min and preweighed PVC filter 37 mm, 5 µm

Parameters:
Flow rate: 1,7 (nylon) 2,75 (GS3) 2 (PPI) L/min
TWA sampling volume: 800 L
STEL sampling volume: -
Remarks: For sampling, the use of a particle selector is required. One commonly used selector is the cyclone. The GS3 cyclone must be used with #997 cassette. As an alternative to the cyclone, the parallel particle impactor (PPI) can also be used at a flow rate of 2 L/min, with cassette 940. 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 (%): 8
Minimum reported value: 8 µg

Reference

IRSST. "Analyse du quartz, de cristobalite et de tridymite dans les poussières aéroportées". Méthode 206-2. Méthodes analytiques. Montréal: IRSST, 1995.

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

substance