E-Limit

Hydrogen cyanide, as CN

CAS Number

74-90-8

Last Revised

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TWA Limit

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STEL

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Ceiling Limit

4.7 ppm

Notes & Notations
  • ACGIH Skin - Contributes to exposure by the skin route
Basis of B.C. Exposure Limit
Minimize the potential for:
  • Headache
  • Nausea
  • Upper respiratory tract irritation
  • Thyroid gland enlargement
  • Note: There may be other potential health effects; refer to ACGIH TLV Documentation and other relevant references.
Synonyms:

HCN

IDLH:

50 ppm

 (Source: NIOSH)
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Ensure no workers are exposed to a substance that exceeds the exposure limits in accordance with OHSR 5.48.