Flammable Liquids

Flammable liquids are liquids that can ignite and burn at relatively low temperatures. In transportation and warehousing regulations, a flammable liquid is defined as any liquid with a flash point at or below 60 degrees Celsius (140 degrees Fahrenheit) under the IMDG Code for ocean transport, or below 100 degrees Fahrenheit (37.8 degrees Celsius) for the strictest DOT classification under 49 CFR. The flash point is the lowest temperature at which a liquid produces enough vapor to ignite when exposed to an ignition source. The lower the flash point, the more dangerous the liquid is to store and transport.

Classification Under DOT and UN Systems

Flammable liquids fall under Hazard Class 3 in both the U.S. DOT system and the UN classification framework. Within Class 3, substances are further divided into Packing Groups based on their flash point and boiling point. Packing Group I covers liquids with a boiling point below 35 degrees Celsius (high danger). Packing Group II includes liquids with a flash point below 23 degrees Celsius and a boiling point above 35 degrees Celsius (medium danger). Packing Group III covers liquids with a flash point between 23 and 60 degrees Celsius (lower danger).

Common flammable liquids encountered in e-commerce logistics include: nail polish and nail polish remover (acetone-based, typically UN1263 or UN1090), perfumes and body sprays (alcohol-based, UN1266), hand sanitizer (ethanol or isopropanol-based, UN1170 or UN1219), paint and paint thinners (various UN numbers depending on composition), lighter fluid (UN1057), and certain cleaning solvents.

Amazon FBA and Flammable Liquids

Amazon restricts FBA storage and fulfillment of flammable liquids based on the product’s SDS (Safety Data Sheet) classification. When a seller lists a product that Amazon’s system flags as potentially hazardous, the seller must submit the SDS for review. Amazon’s hazmat team evaluates the flash point, concentration of flammable ingredients, and overall hazard classification to determine whether the product can be stored in standard FBA fulfillment centers, must be routed to hazmat-approved FCs, or is excluded from FBA entirely.

Products with a flash point below 100 degrees Fahrenheit are almost always classified as hazmat by Amazon. Products between 100 and 200 degrees Fahrenheit may or may not be classified as hazmat depending on other factors in the SDS. Products above 200 degrees Fahrenheit are generally not classified as hazmat for FBA purposes, though they may still require an SDS on file.

The FBA hazmat review process can take several days to several weeks. During this time, the listing may be inactive, and the seller cannot send inventory to FBA. Sellers who source flammable liquid products should initiate the hazmat review before ordering production quantities to avoid warehousing costs on inventory that Amazon may not accept.

Shipping Requirements

Flammable liquids must be shipped in UN-certified packaging that meets performance standards for drop tests, stacking, and leak resistance. Labels must display the Class 3 flammable liquid diamond (red with a flame symbol), the UN Number, and the proper shipping name. Shipping documentation, whether a domestic bill of lading or an international dangerous goods declaration, must include the correct UN Number, proper shipping name, hazard class, packing group, and quantity.

Parcel carriers have specific quantity limits for flammable liquids. UPS and FedEx allow small quantities of certain flammable liquids via ground service under limited quantity or consumer commodity exemptions (49 CFR 173.150 and 173.151), but air shipment of flammable liquids is heavily restricted or prohibited for most consumer products. This affects fulfillment speed for merchants who rely on air-based express shipping.

Warehouse Storage

Warehouses storing flammable liquids must comply with NFPA 30 (Flammable and Combustible Liquids Code), which dictates storage cabinet specifications, maximum quantities per cabinet, aisle widths, fire suppression requirements, and ventilation standards. Prep centers that handle flammable liquid products for FBA sellers need to maintain compliant storage areas and ensure staff is trained on proper handling. MeisterPrep handles products classified as limited-quantity hazmat, ensuring proper storage and labeling during the prep process so the goods meet both carrier requirements for outbound transport and Amazon’s receiving standards at the fulfillment center.