Understanding IBC Date Codes and Expiration

Every HDPE IBC bottle has a manufacture date molded directly into the plastic, typically near the top of the bottle or around the fill opening. The date code format varies by manufacturer but usually includes the month and year (e.g., 06/2022 or 2022-06). Some manufacturers use a clock-face system where dots or arrows point to the month, with the year printed separately.

This date is critical because it starts the regulatory clock for UN/DOT-rated totes. Under 49 CFR 178.801, HDPE composite IBCs used for hazardous material transport must be removed from service within 5 years of the manufacture date of the inner receptacle (bottle). After that date, the tote must be rebottled with a new HDPE bottle or retired from hazmat service.

The cage data plate is a metal plate welded to the steel frame, usually on the front face near the valve. It contains a standardized marking that includes: the UN symbol (a circle with the letters UN), the IBC type code (31HA1 for composite HDPE), the packing group performance level (X, Y, or Z), the maximum gross mass in kilograms, the maximum specific gravity, the hydrostatic test pressure, the month and year of manufacture, the country of manufacture, and the manufacturer's name or code.

For example, a marking reading 'UN 31HA1/Y/2500/1.9/100/04 22/USA/SCH' indicates a composite HDPE IBC, packing group II and III approved, 2,500 kg maximum gross mass, specific gravity rating of 1.9, tested to 100 kPa, manufactured April 2022 in the USA by Schutz. Understanding this marking allows you to verify that the tote is rated for your specific product and application.

An IBC that has exceeded its 5-year DOT period is not necessarily unsafe or unusable — it simply cannot legally be used for regulated hazardous material transport. Many non-regulated applications (water storage, non-hazardous chemicals, agricultural use, DIY projects) can safely continue using totes beyond the DOT expiration date, provided the bottle is still in good physical condition.

For businesses that need to keep totes in DOT-compliant service, rebottling is the most cost-effective option. A new bottle comes with a fresh manufacture date and full 5-year compliance period, while reusing the existing cage and pallet at 50-70% less than a completely new IBC. Baltimore IBC Recycling offers rebottling services with both standard and food-grade bottles.