Compostable
Compostable describes a material or product that biodegrades and disintegrates under specified composting conditions within a defined time while meeting applicable criteria for compost quality and ecotoxicity. A valid claim identifies whether the route is industrial or home composting and connects the item to an available collection and treatment system.
In simple terms
Compostable materials are a subset of biodegradable materials. Industrial facilities usually control temperature, moisture, oxygen, and residence time more closely than a home compost heap, so evidence for one setting does not prove performance in the other. Collection matters because an item sent to landfill, incineration, or a conventional plastics stream will not receive its intended treatment. Certification also does not mean the item can be discarded in nature.
Why it matters
Compostable products can support separately collected organic-waste systems in selected applications, especially where they help capture food residues and are accepted by the facility. A compostable single-use plastic remains a disposable item and may still be avoidable. Used indiscriminately, these products can confuse sorting or contaminate recycling. Clear labeling, compatible infrastructure, and a justified use case are therefore as important as biodegradability under laboratory conditions.
Example
A municipality accepts certified industrially compostable food-waste caddy liners in its organics collection, and its contracted facility confirms that the liners suit its process. The label names industrial composting and local acceptance. The same claim would not establish suitability for home compost, roadside litter, or conventional plastic recycling.
How it differs
Biodegradable
Compostable is a conditional subset of biodegradable with added disintegration and compost-quality criteria. A broadly biodegradable material is not necessarily suitable for industrial or home composting.