Most life science labs ship hazardous materials every week without realizing they're doing it. Dry ice with samples. Flammable solvents to a contract lab. Biological substances to a collaborator. Each of those shipments is regulated under 49 CFR — the DOT Hazardous Materials Regulations — and the penalties for non-compliance run from $500 to $84,000 per violation per day.
Here are the categories where we most often find gaps when we audit life science shipping programs.
1. Dry ice is a hazmat — and almost always mishandled
Carbon dioxide, solid (dry ice) is Hazard Class 9, UN1845. Any package containing dry ice as a refrigerant must be marked with the UN number, the net weight of dry ice in kilograms, and the "Carbon Dioxide, Solid" or "Dry Ice" identification. Packages must also allow CO₂ to vent — no sealed containers. Most labs ship samples on dry ice with no marking whatsoever.
- Mark every package: "Carbon Dioxide, Solid" or "Dry Ice," UN 1845, net quantity in kg.
- Do not seal the outer packaging — venting is required.
- Shipper and receiver must both be trained if they touch the package.
2. Biological substances: Category A vs. Category B
Infectious substances are divided into two categories with very different packaging, marking, and documentation requirements. Category A (UN2814/UN2900) are capable of causing permanent disability or life-threatening disease in otherwise healthy humans or animals. Category B (UN3373) are all other infectious substances. Most clinical and research samples fall under Category B — but the misclassification goes both ways, and either direction creates a compliance problem.
3. Flammable liquids: quantity limits and packaging requirements
Ethanol, methanol, acetonitrile, and most common lab solvents are flammable liquids (Class 3). Shipping them by air has strict quantity limits (1 L per inner packaging for Packing Group II, depending on passenger vs. cargo aircraft). Ground shipments have more latitude but still require proper packaging, labeling (flammable liquid diamond), and in many cases a shipping paper. Most labs ship small quantities of solvents with no documentation beyond a packing slip.
4. Lithium batteries
If you ship any battery-powered equipment — and most labs do — lithium batteries are regulated. Lithium ion and lithium metal batteries each have their own UN numbers, state-of-charge requirements, and packaging rules depending on whether they're shipped standalone or in/with equipment. Airlines have tightened enforcement significantly since 2016. A laptop shipped as equipment with a compliant battery is fine; a standalone spare battery in checked baggage is prohibited.
5. Training: who needs it and what "trained" actually means
49 CFR 172.700 requires that anyone who prepares a hazmat shipment, signs a shipping paper, or handles a package in hazmat transportation be trained — and retrained every three years. "Trained" means function-specific training covering general awareness, safety, security, and the specific hazmat functions the person performs. A general safety orientation does not count. Training must be documented: name, completion date, and materials covered.
6. Shipping papers (ground) and air waybill declarations (air)
Ground shipments of hazmat require a shipping paper (similar to a bill of lading) with a specific sequence of information: proper shipping name, hazard class, UN/NA number, packing group, quantity, emergency response information, and the shipper's certification. Air shipments require a Shipper's Declaration for Dangerous Goods — a formal document that carriers can refuse to accept if improperly completed.
What to do if your program is informal
Most small biotech and diagnostics labs have a "program" that consists of whoever ships things looking up the rules when they remember to. That works until a shipment is intercepted, a carrier refuses it, or a DOT inspector shows up at receiving. Standing up a real program — training, SOPs, a compliant shipping checklist — typically takes 2–3 weeks and dramatically reduces the risk of a rejection or citation.
If you're not sure whether your current shipping practices are compliant, the fastest test is to pull the last 10 shipments you made and run them against 49 CFR requirements. We do this as part of our training engagements and can usually identify the top 3–5 gaps in under an hour.