Hazmat
Definition
Hazmat (hazardous materials, also called dangerous goods) refers to substances that pose risks to health, safety, property, or the environment during transport or storage — such as flammables, corrosives, batteries, and compressed gases — and are governed by strict regulations.
In Practice
Hazmat touches every logistics decision it appears in. Shipments must be classified into one of nine UN hazard classes, packaged to specification, labeled and placarded, documented with dangerous goods declarations, and handled by trained staff under rules like US DOT 49 CFR, IATA DGR for air, and IMDG for ocean. Lithium batteries are the fastest-growing hazmat category in e-commerce fulfillment.
For planners, hazmat means constraints and cost: fewer eligible carriers, hazmat surcharges, segregation rules in storage (oxidizers away from flammables), quantity limits per vehicle or aircraft, and fines that can reach six figures per violation for misdeclared shipments. Warehouses need permits, specialized zones, and trained hazmat handlers.
Frequently Asked Questions
What are the nine hazmat classes?
Class 1 explosives, 2 gases, 3 flammable liquids, 4 flammable solids, 5 oxidizers and organic peroxides, 6 toxic and infectious substances, 7 radioactive material, 8 corrosives, and 9 miscellaneous — which includes lithium batteries. The class determines packaging, labeling, documentation, and carrier requirements.
How does hazmat affect shipping cost and carrier choice?
Hazmat shipments carry surcharges, require certified carriers and trained drivers, and face quantity and routing limits — some classes cannot fly at all, and tunnels or ferries may be restricted. Misdeclaration risks rejected freight and heavy fines, so accurate classification belongs in the item master data.
What is required to store hazmat in a warehouse?
Permits and fire-code compliance, segregation of incompatible classes such as oxidizers and flammables, specified containment and ventilation, spill response equipment, safety data sheets accessible to staff, and documented training. Many 3PLs either specialize in hazmat or exclude it entirely, so verify capability before awarding storage business.
Related Terms
Freight class is a standardized rating system used in US less-than-truckload shipping that groups commodities into 18 classes, from 50 to 500, based on density, stowability, handling, and liability. Higher classes cost more to ship per pound.
Bill of LadingA bill of lading is the legal document issued by a carrier that serves as a receipt for goods, evidence of the transport contract, and in ocean shipping, a document of title to the cargo. It travels with, and controls, the shipment.
Carbon FootprintA carbon footprint is the total greenhouse gas emissions caused by a product, shipment, company, or supply chain, expressed in tonnes of CO2 equivalent (CO2e) across direct operations and purchased energy, and often the full value chain.
Cold ChainThe cold chain is a temperature-controlled supply chain that keeps perishable or temperature-sensitive products, such as food, pharmaceuticals, and vaccines, within a specified temperature range from origin to final delivery, without interruption.