Why does a paper mill reject wax-coated cardboard (like produce boxes)?
Short answer: Wax coating, common on produce boxes and some food packaging, doesn't break down in the standard paper repulping process the way plain cardboard does, so it's treated as a genuine contaminant rather than paper fiber — most standard OCC buyers reject it outright rather than accepting it at a discount, since it can't simply be diluted into a normal load.
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List Free →Why wax is different from other contamination
Most cardboard contamination — grease, light plastic tape, some ink — can be tolerated in small amounts because the pulping process handles minor impurities. Wax coating is specifically formulated to resist moisture, which means it also resists breaking down in the water-based repulping process — it doesn’t dilute away, it just stays as unusable waste in the batch.
What commonly has wax coating
Produce boxes designed to handle wet, refrigerated conditions, some frozen food packaging, and certain specialty shipping boxes are the most common wax-coated cardboard you’ll encounter, and they’re visually similar enough to regular cardboard that it’s easy to mix them in without noticing.
What to do with it
Keep wax-coated boxes out of your regular OCC stream entirely — most standard buyers won’t take them at any price, and mixing even a small amount into an otherwise clean load risks the whole load being rejected on inspection.
How ScrapTrade Makes This Easier
If you’re unsure whether specific boxes are wax-coated, it’s worth checking before including them in a listing — a rejected pickup wastes both your time and the buyer’s, which is exactly the kind of dispute a clear, accurate listing avoids.
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