Hydrocyanic acid

For Hydrocyanic acid, cas no. is 74-90-8; epa rmp tq (lbs) is 2,500; rmp category is toxic; rmp basis for listing is a, b, recorded from its source on 2026-08-15.

Substance: Hydrocyanic acid verified
CAS No.: 74-90-8 verified
EPA RMP TQ (lbs): 2,500 verified
RMP category: toxic our reading
RMP basis for listing: a, b verified
OSHA PSM TQ (lbs): 1000 per osha.gov

Sourceecfr.gov

Verified2026-08-15

Review by2027-08-15

DatasetOSHA PSM vs EPA RMP: chemical threshold quantities side by side

Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.

What the source says

Hydrocyanic acid | 74-90-8 | 2,500 | a, b

— ecfr.gov, retrieved 2026-08-15

What osha.gov says

Hydrogen Cyanide, Anhydrous | 74-90-8 | 1000

— osha.gov, retrieved 2026-08-15

Sources

ecfr.govhttps://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-68/subpart-F/section-68.130
osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.119AppA

Last verified against source: 2026-08-15. Due for re-check by 2027-08-15. This page as Markdown · OKF bundle · full dataset as JSON.