Calcium dithionite or Calcium hydrosulfite

Table row: 622
Proper shipping name: Calcium dithionite or Calcium hydrosulfite
Hazard class: 4.2
UN / NA number: UN1923
Packing group: II
Label codes: ["4.2"]
Special provision codes: ["A19","A20","IB6","IP2","T3","TP33","W31"]
Packaging exceptions (49 CFR 173.***): None
Non-bulk packaging (49 CFR 173.***): 212
Bulk packaging (49 CFR 173.***): 241
Quantity limit, passenger aircraft or rail: 15 kg
Quantity limit, cargo aircraft only: 50 kg
Stowage location (column 10A): E
Other stowage provisions (column 10B): 13
Is forbidden: false

Source

eCFR Versioner full XML — 49 CFR Part 172, HMT — Office of the Federal Register / NARA · Cleared for reuse
Read from https://www.ecfr.gov/api/versioner/v1/full/2026-10-07/title-49.xml?part=172 (49 CFR § 172.101 HMT, data row 622)
Federal government regulatory text; GPO public-domain policy applies to government work; inspect third-party material separately — terms