What 'food-grade' means
A food-grade tote is one whose HDPE resin meets FDA 21 CFR 177.1520 — a regulation that governs the types of olefin polymers allowed to contact food. That standard includes restrictions on additives, colorants, and migration testing.
Importantly, food-grade is a property of the material, not the tote's history. A tote made from food-grade HDPE can be used for non-food contents and still remain food-grade material — but whether it's safe for food contact after that is a separate question about reconditioning and residue.
The two certifications that matter
- FDA 21 CFR 177.1520 compliance letter — confirms the HDPE resin was produced to food-contact specifications.
- UN31A re-certification — a hydrostatic pressure test confirming the tank still meets DOT container standards. Re-certs are good for one year (two for rigid composites).
The five questions to ask
- What did the tote previously contain? A food-grade material doesn't magically become unsafe — but residual contents do matter. Ask for documentation or decline.
- Was it reconditioned, and how? "Rinsed" is not the same as "triple-rinsed with hot caustic." Demand specifics.
- Is there a current UN31A paper trail? If the seller can't produce it, the tote is not legally transportable with liquid inside.
- Is the HDPE resin FDA 177.1520 compliant? Most virgin HDPE is. Some rebottled reconditioned units use new food-grade inners for exactly this reason.
- What grade is the valve and gasket? EPDM is generally food-safe; buna-N is not. A cheap gasket swap changes the answer.
The honest answer for most buyers
If you need a food-grade tote, buy a PTR rebottled unit: original steel cage and pallet, new virgin food-grade HDPE inner, fresh UN31A paperwork, documented gaskets. You'll spend meaningfully less than a brand-new tote — and keep the cage out of the scrap pile for another decade.