UN Approved 4G Hazmat Boxes for Air & Sea

The UN packaging code for a fiberboard box is 4G. This code appears as part of the UN mark printed on compliant packaging — for example, UN 4G/Y15/S/24/USA. The '4' identifies the package as a box, while 'G' specifies fiberboard (corrugated cardboard) as the construction material, certifying it for hazardous materials transport.

Dangerous goods must be shipped in UN-certified packaging that has passed performance tests for drop, stacking, vibration, and leakage. For fibreboard boxes, the required designation is 4G. Packaging must display a full UN mark indicating packing group compatibility, maximum gross mass, country of manufacture, and year of production to satisfy IATA, IMDG, and DOT regulations.

A 4G package is a UN-certified corrugated fiberboard box designed to safely contain and transport hazardous materials. The designation '4' refers to a box-style outer packaging, and 'G' specifies fiberboard as the material. 4G boxes must pass a series of UN performance tests including drop, stacking, and vibration tests before receiving certification for air or sea dangerous goods shipment.

Single wall 4G boxes use one layer of corrugated fluting between two liners, suitable for lighter hazardous goods within lower packing group limits. Double wall boxes incorporate two fluted layers for significantly greater puncture resistance and stacking strength, making them appropriate for heavier, higher-risk dangerous goods requiring maximum structural integrity during air or sea transit.

Yes, UN-certified 4G fiberboard boxes are approved for both air freight under IATA Dangerous Goods Regulations and sea freight under the IMDG Code, as well as ground transport under DOT 49 CFR. The same UN mark — including packing group rating and maximum gross mass — governs compliance across all three modes of transport when the contents and quantities meet applicable requirements.

Yes, custom-sized 4G hazmat boxes can be manufactured to exact interior dimensions required by your product and UN packaging specification. Custom orders include full compliance documentation and UN certification markings. It is important to verify that custom configurations are tested and certified under the appropriate UN performance standards before use with regulated dangerous goods.