What 'food grade' actually requires from a bulk container
Food-grade is not a property of a box, it is a property of a documented system. What auditors actually ask for, where used boxes can and cannot be used, and how a liner changes the answer.
By Priya Raman, Quote desk · 7 min read · Published March 12, 2024
Have a question this raised?
Tell us what you have or what you need. A real person in Houston reads every one of these — usually within a couple of hours during dock time.
- The principle: it is about the contact surface
- Case one: fiber is the contact surface
- Case two: an FDA-compliant liner separates the two
- What auditors typically ask for
- The grey areas
- Pest control, which nobody thinks about until they fail
- How we handle food customers
Food-grade status depends on the contact surface and its documented history, not on the container type. If fiber touches the product you need new board with supplier documentation. If an FDA-compliant liner separates product from fiber, a Grade A used box is frequently acceptable — but the decision belongs to your own audit scheme, not to your box supplier.
- Category
- Specification
- Published
- March 12, 2024
- Written by
- Priya Raman, quote desk
This is the question we most often get wrong answers repeated back to us. Somebody's previous supplier told them used boxes are 'food safe', or that they definitely are not, and both statements are too simple to be useful.
The principle: it is about the contact surface
Audit schemes care about what touches the product and what is known about that surface's history. A container is not food grade or not food grade in the abstract — the assembly is compliant or it is not, and the assembly includes the liner, the closure and the documentation.
Once you internalise that, most of the confusion resolves. The question is not 'can I use a used box'. The question is 'what touches the product, and can I document where that surface came from'.
Case one: fiber is the contact surface
Product poured directly into corrugated. Here you need new board, with the box maker's documentation on file: material declarations, and confirmation that the board and any coatings are suitable for the contact type and duration.
Used board cannot satisfy this. Not because used board is dirty — much of it is visually cleaner than new board that has sat in a warehouse — but because nobody can attest to what was in it before. Chain of custody is the whole point, and used stock does not have one.
Case two: an FDA-compliant liner separates the two
Product goes into a poly liner, liner goes into the box, product never touches fiber. Now the food-contact surface is the film, and the film has documentation you can file.
In most audit regimes this is acceptable, and it is what a large share of the food operations we supply actually do. It converts a new-box purchase into a used-box purchase plus a few dollars of film, which on a seasonal harvest volume is a substantial number.
What auditors typically ask for
- Specification and material declaration for the contact surface — the film, or the board.
- Supplier approval records for whoever provided it.
- Evidence of storage conditions: pest control, off-floor storage, segregation from chemicals.
- A stated policy on reuse, and evidence you follow it.
- Traceability: which lot of packaging went with which lot of product.
Notice how much of that is about your warehouse rather than about the box. Operations fail this section far more often on storage practice than on the container itself.
The grey areas
- Outer packs where product is already in a sealed primary package. Used board is normally fine, and this is a very common use.
- Dry, low-risk, non-hygroscopic ingredients in a lined container — usually acceptable, scheme dependent.
- Anything wet, fatty, or intended for direct human consumption without further processing — treat as case one and buy new.
- Organic certification, which can carry its own packaging conditions independent of food safety.
Pest control, which nobody thinks about until they fail
Corrugated is a pest harbourage in the same way any fiber is. Food-adjacent storage means boxes off the floor, away from walls, rotated, and inspected. Our own yard segregates food-programme stock, and we will not knowingly sell a box for food use that came off a load with any evidence of pests, regardless of grade.
How we handle food customers
- We ask what the contact surface will be before quoting anything.
- If fiber, we quote new and supply the documentation. We do not try to talk anyone out of it.
- If lined, we quote Grade A used plus an FDA-compliant liner and supply both spec sheets.
- Seasonal customers get allocation: we hold the harvest volume on our yard and release weekly, so it is not sitting in your building for four months.
- ECT
- Edge Crush Test. Pounds per linear inch a board edge withstands before buckling. The best single predictor of stacking performance.
- Grade (box)
- A condition classification for used boxes. 1A new, A one clean use, B up to two repairs, C multiple repairs, then scrap.
- Liner
- The flat facing sheets on either side of the fluted medium.
Priya Raman — Quote desk
Written on the yard at 1050 E Richey Rd, Houston. Everyone who writes here works the grading line, the baler, the routes or the quote desk — there are no guest posts and nothing on this blog is syndicated.