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STACKMANBetter basics for everyday living.

Quality and certification

We make 141 products across 8 departments. 57 of them are made from sugarcane bagasse, which we mould into plates and bowls. Another fifty-one use clear PET plastic, and six are aluminium.

When we say a product is compostable, BPI certified, PFAS-free, or leak-resistant, those are claims from our own product copy, counted across our catalogue. The certification block on each page tells you who tests against what standard. Certificate numbers and registration dates belong to the bodies that issue them.

What we test

We test disposables the way you use them. A plate in our range has to hold a full portion of something heavy and wet without sagging or soaking through. We load it up and leave it sitting, because that is what happens at a buffet line or a backyard cookout. If the rim goes soft or the base bows, we do not carry it.

Lids get a different treatment. We open and close them until the seal starts to give out. A lid that leaks after a dozen uses is not much good for a kitchen that goes through containers by the sleeve, so we count the cycles. When it stops holding tight, we stop counting.

Cups take a drop test from counter height. We want to know whether they crack or split when they hit a tile floor. Most of us have knocked a drink over while we are reaching for something else. The cup should survive that moment without spilling everywhere.

These tests are not glamorous. They are the things we check before we put our name on anything, and every item in the catalogue is made for everyday use, not for conditions it was never built for.

A three compartment bagasse plate
A 10 inch three-compartment plate. The dividers are moulded in, not glued on.

What we state, and on how many lines

Counted from our own product copy across the range.
ClaimLinesWhat it means here
100% compostable57Made to break down in a commercial composting facility that accepts food-service fibre
BPI Certified27We state third-party compostability certification on these
PFAS-free26No intentionally added fluorinated chemicals stated
BPA-free29Stated on our plastics
Leak-proof or resistant40The seal is meant to hold liquid in transit
Microwave safe7Stated for reheating contents, never the lid
Freezer safe20Stated to hold up at freezer temperatures

What we say about our products is what we can back up. Across the catalogue, 57 of our lines are made from sugarcane bagasse and we state that every one of them is compostable. Certificate numbers and registration dates belong to the bodies that issue them.

What we do have is BPI certification on 27 of those bagasse products. The Biodegradable Products Institute runs an independent lab test that checks whether a material breaks down in a commercial composting facility within a set timeframe and leaves nothing harmful behind. When we mark something as BPI Certified, it means that product passed.

We also call out PFAS-free status on 26 items in the range. PFAS are a group of chemicals used to make paper and molded fiber resist grease and water, and they do not break down in soil or water. We do not use them on those 26 lines.

You will see BPA-free stated on 29 of our plastic products as well, which tells you the PET contains no bisphenol A. These are the material claims we make in our own copy, counted from the full list of what we sell. If a claim is not printed here or on a product page, we are not making it.

Products may no longer be claimed as BPI-certified unless they meet all conditions of the rule, including no intentionally-added fluorinated chemicals, a test report showing less than 100 ppm total organic fluorine, and a technical review of the formulation.

Biodegradable Products Institute, Compostability Certification, read 22 August 2026

Treat a product without a stated claim as not carrying it: a plate without the compostable mark goes in the bin, not the compost.