This site is a non-commercial introduction to the science and standards behind bioplastics — what the term actually means, how compostability is certified, and where bio-based materials genuinely reduce environmental impact.
What "bioplastic" actually means
The word "bioplastic" is used loosely in marketing, but in the scientific literature it covers two distinct (and sometimes overlapping) properties:
- Bio-based: the polymer is made (partly or wholly) from renewable biological sources — corn starch, sugar cane, cellulose, algae — rather than fossil petroleum.
- Biodegradable: the polymer can be broken down by microorganisms into CO₂, water, and biomass under defined conditions.
A plastic can be one, both, or neither. PLA (polylactic acid) is bio-based and biodegradable under industrial composting. Bio-PE (bio-polyethylene) is bio-based but not biodegradable. Some petroleum-based plastics, conversely, are biodegradable. The label "bioplastic" alone tells you little without clarification.
Compostability standards
"Compostable" is not a vague claim — it is a measurable standard. The relevant certifications include:
- EN 13432 (Europe) — industrial composting requirements.
- ASTM D6400 (US) — equivalent compostability standard.
- TÜV "OK compost HOME" — home composting at lower temperatures.
Most certified-compostable bioplastics require industrial facilities (50–70°C, controlled humidity). They typically do not break down meaningfully in a backyard compost pile, a landfill, or the open environment. This gap between label and behavior is the main source of public confusion about bioplastics.
Where they help, where they don't
Independent life-cycle analyses generally find bioplastics most useful in contexts where:
- Industrial composting infrastructure already exists.
- The product is contaminated with food waste (compostable cutlery, food-service items).
- The bio-based feedstock genuinely displaces fossil carbon, not just shifts emissions upstream.
They are less useful when the disposal route is landfill (where any plastic, bio or not, simply sits) or unmanaged litter (where most bioplastics persist almost as long as conventional plastics).
Suggested reading
- European Bioplastics — industry association, but publishes reliable technical data.
- Ellen MacArthur Foundation — circular economy reports on plastics.
- Academic journals: Polymer Degradation & Stability, Bioresource Technology.
- National standards bodies (ISO, CEN, ASTM) for the underlying compostability standards.
About this site
An independent, non-commercial reading list. We do not sell products, certify materials, or endorse any specific brand or manufacturer.