| name | hazardous-materials-table-49cfr-172-101 |
| description | Use when identifying or classifying a material. Covers the structure of the Hazardous Materials Table (HMT), the columns and what each means, and how to look up shipping requirements.
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Hazardous Materials Table 49Cfr 172 101
The HMT (49 CFR 172.101) is the master lookup table. Every hazmat has an entry. Find the entry, you find every requirement.
Table structure
10 columns. Column 1: symbols (proper for international, exception, etc.). Column 2: Hazardous Materials Description and Proper Shipping Name. Column 3: Hazard class or division. Column 4: ID number (UN/NA). Column 5: Packing group. Column 6: Label codes. Column 7: Special provisions. Columns 8a-c: Packaging exceptions, non-bulk, bulk. Columns 9a-b: Quantity limitations. Column 10: Vessel stowage requirements.
UN vs NA numbers
UN = United Nations 4-digit identifier (international). NA = North American (US-only). Most modern hazmat uses UN. Examples: UN1203 (gasoline), UN1075 (LPG), UN1090 (acetone).
Packing groups
I (great danger — most strict). II (medium danger). III (minor danger). Determines packaging requirements + quantity limits.
Looking up a material
Find the proper shipping name in column 2 OR find the UN number in column 4. Read across the row for all requirements.
Special provisions (column 7)
Most-overlooked column. Specifies exemptions, exceptions, additional requirements. Examples: '129' (overpacking), '173' (bulk packaging limit), 'IB1' (IBC code).
Where this fits in X3 Compass
Applied in the X3 Compass Hazmat Center — the vertical add-on for hazmat-hauling motor carriers.
