Bioplastics (PLA)
Plant-derived plastic that only composts in industrial conditions.
What it is
Polylactic acid is polymerised from fermented plant starch, usually corn or sugarcane. It looks and behaves like conventional plastic but is bio-based rather than fossil-based.
Why it matters
PLA cuts fossil feedstock use, but 'compostable' on the label almost always means industrial composting at 55–60 °C. In a home bin, in the ocean, or in landfill it behaves much like ordinary plastic — and it contaminates PET recycling streams.
Upsides
- Renewable feedstock instead of petroleum
- Lower production emissions than virgin PET
- Genuinely breaks down in industrial composting
- Useful where food contamination rules out recycling
Trade-offs
- Needs industrial facilities most regions don't have
- Contaminates PET recycling if binned wrongly
- Competes with food crops for land
- 'Biodegradable' claims are routinely overstated
What to look for on the label
TÜV OK compost HOME (not just INDUSTRIAL), EN 13432 or BPI certification, and confirmation your council actually accepts it.
Better or comparable alternatives
Compare bioplastics (pla) in a finished product
Material choice is only part of the decision. The same material can appear in very different products: compare composition, expected use and end-of-life options before treating it as a better replacement.
- Composition and sourcing
- Use the label guidance above to check the actual percentage of bioplastics (pla), any blends, coatings or adhesives, and which component a certificate covers. A claim about one input does not describe the whole product.
- Use and maintenance
- Weigh the listed upsides and trade-offs against the job you need it to do. Check care instructions, repair options and whether a comparable item you already own could serve the same purpose.
- Disposal in your area
- Ask your local collection service about the finished item, not just its main material. Blends, coatings and attachments may change how it can be collected. Do not assume a recyclable or compostable claim applies to your household system.
Frequently asked
Can I put PLA in my home compost?+
Only if it carries an OK compost HOME mark. Standard PLA needs sustained industrial heat and will sit intact in a garden heap for years.
Is bioplastic better than recycled plastic?+
Usually not for packaging. Recycled PET has a well-established collection stream; PLA mostly ends up in landfill or contaminates recycling.