Hazmat segregation & placard checker
Add each hazardous material on the truck with its class and weight. You get the placards required and a pair-by-pair segregation check, straight from the federal tables.
Updated October 2026 · Free, no signup
Placards and segregation
- Placards required
- 2
- Table 2 materials, total
- 1,800 lb
- Segregation
- OK
- FLAMMABLE
- CORROSIVE
- or DANGEROUS (see note)
- Two or more Table 2 placards apply, so DANGEROUS may replace them (172.504(b)).
3 Flammable liquid with 8 Corrosive liquid. No restriction in the segregation table.
49 CFR 172.504 and 177.848, eCFR current as of 2026-10. Highway, domestic. Confirm against the regulation and your shipping papers; subsidiary hazards and special provisions can change the answer.
FLAMMABLE, CORROSIVE for this mix. We dispatch hazmat and tanker carriers with the H endorsement, and you confirm every load.
Get hazmat load offersHow the checker works
The checker applies two federal tables exactly as written, for highway transportation within the US.
Placards (49 CFR 172.504). Table 1 materials need placards in any quantity. Table 2 materials need placards once the vehicle carries 1,001 lb or more of them in total, or any amount in bulk. With two or more Table 2 categories, DANGEROUS may replace them, unless one category reaches 2,205 lb from a single loading facility. Then the checker applies the exceptions in 172.504(f): only the lowest explosive division, no NON-FLAMMABLE GAS with FLAMMABLE GAS, no OXIDIZER with EXPLOSIVES 1.1, 1.2 or 1.5, no POISON INHALATION HAZARD with POISON GAS, and no CLASS 9 placard for domestic moves.
Segregation (49 CFR 177.848). Every pair of materials is looked up in the segregation table: X means not together, O means only if separated so leaks can't mix, and blank means no restriction. Explosives against explosives use the compatibility group table in 177.848(f). Note A, the ammonium nitrate exception, is applied when you tick it.
Source: 49 CFR 172.504 and 177.848 (eCFR) · checked 2026-10
Worked example
| EXAMPLE load | Class | Weight |
|---|---|---|
| Paint | 3 Flammable liquid | 1,200 lb |
| Battery acid | 8 Corrosive liquid | 600 lb |
Both are Table 2. Together they total 1,800 lb, over 1,001 lb, so FLAMMABLE and CORROSIVE placards are required, or DANGEROUS instead, since neither reaches 2,205 lb. In the segregation table, Class 3 and Class 8 liquids have no restriction. Swap the paint for a Division 4.2 material, and the table returns X: those can't share a truck.
What it doesn't cover
Subsidiary hazards can make segregation stricter (177.848(e)(6)); add the subsidiary class as its own line if your shipping paper shows one. Special provisions in the Hazardous Materials Table, cyanides with acids (177.848(c)), poisons with foodstuffs (177.841), and rail, air or vessel rules are outside this checker. Always confirm against the regulation and the shipping papers.
Placards, papers and the driver
The shipper provides the placards and shipping papers, and the motor carrier must apply the placards to the vehicle (49 CFR 172.506). The driver keeps the papers within reach. A wrong placard is a violation for the carrier, not just the shipper. Check the load against the paper before you leave the dock.
Questions about this calculator
When do I need hazmat placards?
Materials in Table 1 of 49 CFR 172.504 need placards in any amount: Divisions 1.1-1.3, 2.3, 4.3, Type B temperature-controlled organic peroxides, poison inhalation hazards and Radioactive Yellow III. Table 2 materials need placards when the vehicle carries 1,001 lb or more of them in total, or in any amount in bulk packaging.
What is the 1,001 pound rule?
On the highway, a vehicle carrying non-bulk packages of Table 2 materials doesn't need placards if the aggregate gross weight of all Table 2 materials is under 1,001 lb (172.504(c)). It doesn't apply to Table 1 materials or bulk packaging.
When can I use the DANGEROUS placard?
When non-bulk packages of two or more Table 2 categories that need different placards are on the vehicle, a DANGEROUS placard may replace them. But any one category with 2,205 lb or more loaded at one facility must carry its own placard (172.504(b)).
What do X and O mean in the segregation table?
X means the two materials may not be loaded, transported or stored together in the same vehicle. O means they may ride together only if separated so leaking packages couldn't mix under normal transport conditions (177.848(e)). A blank means no restriction.
Do I need a hazmat endorsement to haul placarded loads?
Yes. A driver hauling hazardous materials that require placards needs a CDL with the H endorsement, or X for tank vehicles with hazmat. That means a TSA security threat assessment too.
Numbers done. Want someone to find loads that beat them?
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