What 172.325B means in plain language
FMCSR 172.325B governs the marking of shipments containing molten aluminum or molten sulfur. When you transport these materials, federal hazmat rules require specific, clearly visible identification on the outside of the container or package so that anyone handling, inspecting, or responding to an incident knows exactly what's inside.
If you receive a citation for this code, it means an inspector found that your shipment's marking—whether the label itself, its placement, its condition, or its completeness—did not meet federal standards. The marking must be durable, legible, and placed where it's immediately visible. Faded, obscured, missing, or incorrectly positioned marks all fall under this violation.
This is a hazardous materials compliance issue. Unlike some violations tied to mechanical failure or driver conduct, marking problems are directly within your control and your carrier's responsibility to verify before the vehicle leaves the facility.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.325B is cited infrequently—3 all-time citations rank this code #2551 out of 3,036 FMCSR codes by volume. Over the last 12 months, we recorded 2 citations; in the last 90 days, 2 citations appeared. None of the 3 all-time citations resulted in an out-of-service order, giving this code a 0.0% OOS rate.
For context, the all-FMCSR average OOS rate is 31.4%. The fact that 172.325B has never triggered an OOS placement in our database suggests inspectors are treating these violations as documentation or marking defects that are correctable on-site rather than safety-critical failures. However, rarity does not mean irrelevance—hazmat marking violations can have serious downstream consequences if your load reaches a facility or emergency responder who cannot identify its contents.
Who gets cited most
In the last 180 days, all citations for 172.325B—2 in total—were issued in Texas. Both resulted in 0 OOS placements, maintaining the 0.0% statewide OOS rate for this violation in that period.
Our all-time data shows three carriers with one citation each: Gulf Transport LLC (USDOT 1914588), Especializados Sagot SA de CV (USDOT 2355640), and Transportes de Hidrocarburos y Liquidos SA de CV (USDOT 3789632). The concentration of citations across different fleets and the very low citation count overall indicate this is not a widespread pattern tied to any single operation.
How severe is this compared to similar codes
Hazmat marking and placarding violations span a wide severity spectrum. Our data shows dramatic differences across peer codes in the hazardous materials category:
177.834A-HMC (General loading/unloading hazmat) has recorded 3,954 citations with a 99.2% OOS rate—meaning nearly every violation results in immediate removal from service. 177.817(a) (Placarding violation) sits at 2,274 citations with a 75.1% OOS rate. In contrast, 172.516(c)(6) (Placard damaged, deteriorated, or obscured) has 1,796 citations but only a 1.6% OOS rate.
Your citation—172.325B—aligns more closely with the lower-OOS tier. This suggests that improper molten metal marking is generally treated as a correctable documentation issue rather than an immediate safety shutdown. However, the specificity of your violation (molten aluminum or molten sulfur, not general placarding) means it will likely require proof of correction before you're cleared to move the shipment.
How to avoid it
Before loading and departure:
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Inspect hazmat markings before accepting the load. Check that all labels for molten aluminum or molten sulfur shipments are present, legible, and securely affixed. Look for fading, peeling, or damage. If a marking is compromised, do not accept the shipment until it is relabeled.
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Verify placard placement and visibility. Molten metal shipments require markings on all four sides of the vehicle or container where they can be seen during normal transportation and inspection. Walk around the unit and confirm each marking is unobstructed and facing outward.
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Confirm markings match the shipping papers. Cross-reference the hazmat labels on the package against the Bill of Lading or hazmat manifest. Discrepancies must be resolved before departure.
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Document your pre-trip check. Take photos or note timestamps of hazmat marking verification in your pre-trip inspection log. This creates a record that you performed due diligence.
During transport:
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Avoid covering or obscuring markings. Do not wrap, tape over, or allow cargo to contact or cover any hazmat label. If weather or road conditions damage a marking, stop and repair it as soon as safely possible.
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Maintain vehicle cleanliness. Mud, dust, or residue on containers can obscure markings. Clean the outside of hazmat packages if they become soiled during transport.
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Respond promptly to roadside feedback. If an inspector or shipper alerts you to a marking problem, treat it as urgent. Many corrections can be made in minutes and prevent escalation to an OOS order.
The co-occurring citations in our data—including brake system issues, window obstructions, and tire defects—underscore that hazmat violations often cluster with general maintenance oversights. A thorough, methodical pre-trip inspection that includes both hazmat-specific and mechanical checks is your best defense.