Answers usually open with “it depends.” That is not helpful. This is where it separates. Clean offcuts walk straight into the repulp stream with no argument at all. The sheet you lifted a duck breast off in the oven does not, and no amount of good intention changes that. Biodegradable tells you even less, because the word says nothing about what the paper was coated with. Two questions, not one.
Clean or greasy, that is the whole question
A mill doesn’t turn away greasy paper because it objects to yesterday’s chips. It turns it away because fat changes how fibre behaves in the pulper. Coated in oil, the fibres clump, froth builds in the tank, and yield drops. On a line taking a few hundred tonnes a day, even a small share of contaminated feedstock can push a batch toward landfill while it is still churning. The arithmetic is unforgiving.
Size matters too. Small sheets make it through the pulper only to be rejected again at the screens, too small and too wet to re-form into anything useful. A crumpled square the size of your palm is almost lost before it starts.
So the decision at the bin is about your municipality, not about the paper. Some councils now accept used food paper in the organics caddy. Most do not. Find the one rule that applies where you live and stop hunting for a global answer to a local question.
The coating decides more than the fibre
Four routes to fat resistance, four different endings. High beating plus supercalendering gets there on fibre alone, dense and closed with no chemistry involved, and it takes the cleanest path through any composting scheme. Silicone sits as a thin cured layer and behaves well in practice, though whether it re-pulps cleanly varies by mill tolerance, so ask instead of assuming. Polyethylene film does not break down and leaves you with a laminated composite that almost no recycling line wants. Fluorochemical treatment is the one to handle carefully, because PFAS restrictions are moving fast and a wrap bought two years ago may not support the claim you are printing on it now.
A PFAS-free greaseproof paper supplier should be able to send a testing report with a reference number, not a photograph of a certificate. If they hesitate, you have your answer.
Compostable is a process, not a personality
EN 13432 and ASTM D6400 describe conditions your customer’s kitchen will never reach. Sustained 55 to 60°C, controlled moisture, regular turning, industrial throughput. Home composting claims need separate certification, with a lower temperature window and a much longer clock, and most bakery wraps on the shelf don’t hold it. If you are specifying a compostable greaseproof paper factory for a catering account, ask for the certificate number and the exact standard name, because a logo alone proves nothing to a waste authority.
The classic failure is claiming home compostability from an industrial test report. Match the mark on the artwork to the mark on the lab result before plates are made. We have watched that mismatch travel all the way into print.
What you can actually put on the box
Recyclable needs a local collection scheme that exists, and a reviewer will ask which one you mean. Compostable needs a certification, plus a disposal instruction on the face of the pack. It is the vague vocabulary — biodegradable, green, eco — where regulators are squeezing hardest, and in the EU the pressure tightens every year. Our advice to any private label greaseproof paper supplier client is to drop the abstract language and keep the practical sentence: fibre-based, certified by name, suitable for industrial composting, keep out of kerbside paper recycling. That last line prevents more complaints than any badge.
What to ask before you sign
Ask what the sheet is coated with and whether fluorine appears anywhere in the process. Ask for the certificate number rather than the logo. Ask whether the sheet has been re-pulped at a named mill and at what ratio. Ask for grammage, and what happens to it after thirty minutes at 200°C, because thin stock browns and flakes long before it is anywhere near igniting.
A bulk greaseproof paper roll distributor who cannot answer those four in writing is selling you a commodity and hoping you don’t notice. Meanwhile an OEM greaseproof paper supplier for export buyers will usually have the documentation already collated, because their customers keep asking.
Then test it yourself. Soak a sheet overnight in warm water. Bury a square in the garden for eight weeks. Tear one across the middle and look at whether the surface peels away from the fibre. Any food-grade greaseproof paper manufacturer worth the freight will welcome that, and the straight ones will tell you what the result means before you have to ask. Buyers who skip this step tend to learn the difference between recyclable and repulped in front of their own retail customers, in the aisle, with a shelf-talker that made a promise the paper couldn’t keep.
