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Loading, transporting, and storing hazardous materials under U.S. regulations (49 CFR)

Chemical of the Week: UN 1066 - Nitrogen

Chemical searchUN, name, CAS, special provisionsSegregation check49 CFR 177.848 - load, transport, storageSegregation tableFull segregation matrix (49 CFR 177.848)ERG guidesEmergency Response Guidebook

Most searched this month

  1. UN 1993 - Flammable liquids, n.o.s.
  2. UN 3077 - Environmentally hazardous substance, solid, n.o.s
  3. UN 1956 - Compressed gas, n.o.s
  4. UN 2794 - Batteries, wet, filled with acid, electric storage
  5. UN 3480 - Lithium ion batteries including lithium ion polymer batteries

Latest updates

  • May 2026Substance information (info search): Each entry now opens with an At a glance summary (UN/ID, hazard class, packing group, ERG guide, special provisions) and an HMT snapshot badge showing the active…
  • May 2026Dataset update: The HMR Hazardous Materials Table (49 CFR §172.101) has been rebuilt from the current eCFR release. The active table contains 3,687 rows (approximately 3,005 entries with UN/NA/ID num…

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