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Chemical Sampling Information (CSI)
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General Description

OSHA IMIS Code Number: 2536

Chemical Abstracts Service (CAS) Registry Number: 7440-33-7

Chemical Description and Physical Properties:

    Solid.

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

    Construction Industry: 5 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 mg/m3 TWA; 10 mg/m3 STEL

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA; 10 mg/m3 STEL


Health Factors

Health Effects: Apparent low toxicity/lung accumulation (HE19)


Monitoring Methods used by OSHA

Laboratory Sampling/Analytical Method:

  • sampling media: Mixed Cellulose Ester Filter (MCEF) 0.8 microns
    maximum volume: 960 Liters
    minimum volume: 480 Liters
    maximum flow rate: 2.0 L/min
    current analytical method: Inductively Coupled Argon Plasma; ICP-AES
    sampling and analytical error: 0.11
    method reference: 2 (OSHA ID-213)
    method classification: Fully Validated
    note: Air sampling of cemented tungsten carbides and tungsten alloy matrices may contain cobalt; these should be sent to the lab to be analyzed for cobalt and tungsten by ID-213.

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