Cyanide and Acid on the Same Trailer

No. The Hazardous Materials Regulations prohibit loading or storing cyanides or cyanide mixtures with acids. This is one of the absolute segregation prohibitions, not one of the pairs that can be handled by separation, blocking or bracing.

The reasoning is chemical, not bureaucratic. Sulfuric acid plus a cyanide salt liberates hydrogen cyanide - a fast-acting, potentially lethal inhalation poison. The reaction does not require a crash: a forklift puncture, a drum that walks off a pallet and splits a chime, a leaking bung, or rainwater entering the van in a hard summer thunderstorm at a New Jersey dock can start it. Emergency responders arriving at a mixed load of this type face a fume cloud with no visible fire and no obvious cause.

Why the supervisor's points fail:

• "They're closed." The rule applies to the material, not to the condition of the packaging on the day of loading. Drums fail.
• "Three rows back / blocked." Separatation by distance or dunnage is irrelevant to a prohibition of this kind. There is no compliant configuration.
• "Same route." Routing convenience has no bearing on segregation.
• "Never happened in twenty years." The regulation is not a frequency analysis; it exists for the one time.

The driver shares legal responsibility for loading. The fact that the supervisor directed it is not a defense.

Do not load the second commodity into that trailer. Do this in order:

1. Stop loading and say why, citing the cyanide-with-acid prohibition. Be specific and unemotional: "Cyanide salt and acid cannot go in the same vehicle, no exceptions."
2. Call your dispatcher before leaving the dock, so the decision is made by the carrier with the facts in hand, not reconstructed later.
3. Offer the shipper compliant options: two vehicles; two trips with the second trailer; ship the acid today and the cyanide on tomorrow's run; or tender one of the two to another carrier. If a trailer must be swapped, confirm the clean trailer has no acid residue - a van that previously carried acid and was not cleaned can leave enough contamination to matter.
4. Record the refusal. Note on the bill of lading or a delivery exception: date, time, the two commodities, the specific rule, the name of the supervisor who directed the load, and the fact that you refused. Photograph the paperwork and the two doors.
5. If pressured, escalate to the carrier's safety director and ask for the instruction in writing. A supervisor who will not put it in writing is telling you the answer.

If you had already loaded both, unload one before the vehicle leaves the property. Once you are on the road with a prohibited combination, you own the problem.

Securement: not legal. The aggregate working load limit of all tiedowns must be at least 50 percent of the cargo weight.

Cargo: 2,400 lb → required aggregate WLL = 1,200 lb. Your straps: 4 × 275 lb = 1,100 lb. Shortfall: 100 lb.

So the four cam straps are insufficient even though "they held last time." Fixes: add a fifth strap (1,375 lb aggregate), or replace them with two 2-inch ratchet straps rated well above the requirement. Also check the rest of the securement picture: each tiedown must be attached to the vehicle and to the article; straps over steel drums need edge protection and must be snug, not slack; drums should be loaded tight against each other and blocked or braced so they cannot shift forward under braking; and remember that a strap that is chafed, cut or has a damaged ratchet no longer counts at its marked rating.

Placards: CORROSIVE on all four sides. 2,400 lb of a Table 2 Class 8 material exceeds the 1,001 lb aggregate threshold, so CORROSIVE placards go on both sides, the front and the rear before the vehicle moves. Sodium cyanide, shipped alone, would be 1,200 lb - also above 1,001 lb - and would require POISON placards. Neither load, shipped alone, requires you to placard the other class.