Aerosols as Dangerous Goods: UN1950 Shipping Rules

Aerosols are classified as Class 2 (Gases) dangerous goods under UN1950, and the specific rules that apply to a given shipment depend heavily on what's inside the can — flammable, corrosive, non-flammable, or toxic aerosols each carry different subsidiary risks and, in some cases, different transport restrictions entirely.

Why UN1950 Isn't a Single Rule Set

Unlike single-hazard entries, UN1950 covers a family of subcategories based on the aerosol's contents and their own individual hazards:

• UN1950, Aerosols, flammable (each not exceeding 1 L capacity) — Class 2.1
• UN1950, Aerosols, non-flammable (each not exceeding 1 L capacity) — Class 2.2
• UN1950, Aerosols, corrosive, Packing Group II or III (each not exceeding 1 L capacity) — Class 2.2 with subsidiary risk (8)
• UN1950, Aerosols, poison, Packing Group III (each not exceeding 1 L capacity) — Class 2.2 with subsidiary risk (6.1) (HazmatTool)

Two cans both labeled "UN1950" can require entirely different subsidiary-risk labeling and, on some carriers, different acceptance decisions — the contents, not just the aerosol format, determine the actual compliance obligation.

Packaging Requirements

Aerosol containers must be approved for aerosol use and built to withstand normal transport conditions. Regulatory limits cap capacity by receptacle material: metal receptacles may not exceed 1000 mL, and plastic receptacles may not exceed 500 mL (Goodhope Freight). A can that exceeds either threshold no longer qualifies under the standard aerosol packing provisions.

Air Transport Restrictions

Some aerosol subcategories are forbidden outright on aircraft. Flammable aerosols that also contain a toxic gas classified as 2.3(2.1) cannot be shipped by air under IATA rules, regardless of packaging or documentation (Goodhope Freight). Shippers moving aerosol products internationally by air need to confirm their specific formulation isn't on this restricted list before booking.

Labeling and Documentation

For limited-quantity aerosol shipments by sea or air, a transport document — a dangerous goods note — showing the UN number, proper shipping name, classification, and the limited-quantity designation is required (Goodhope Freight). Full-quantity (non-limited) aerosol shipments require the complete DG documentation set applicable to their hazard class and subsidiary risk.

The Compliance Trap in Product Reformulation

Aerosol shippers who reformulate a product — switching propellants, changing a corrosive additive, adjusting flammability — need to re-run classification, because the change can shift the shipment into a different UN1950 subcategory with different subsidiary risk labeling and, in some cases, different aircraft eligibility. Treating "it's the same UN number as before" as proof of continued compliance is a common and costly assumption.

How Inspection Software Helps

DG inspection software that checks an aerosol shipment's declared subcategory — flammable, corrosive, non-flammable, or poison — against its actual subsidiary risk labeling and mode-specific restrictions catches the exact error that reformulation introduces: a UN number that's technically correct but a classification that's now outdated.

The Bottom Line

Aerosols shipped under UN1950 aren't a single compliance profile — flammable, corrosive, non-flammable, and poison aerosols each carry distinct packing groups, subsidiary risks, and in some cases outright air transport bans. Getting the subcategory right, and re-verifying it whenever a product's contents change, is the difference between a compliant shipment and one that only looks compliant on the label.

Sources:

• UN 1950: Aerosols, flammable — HazMat Tool
• A Logistics Specialist's Guide: Managing Regulatory Compliance for Aerosol Shipments (UN1950) — Goodhope Freight