Compostability Testing

Amber Davidson, WIST Compostability Testing Laboratory Manager, prepares a sample for evaluation.

Our compostability testing service is helping packaging and other manufacturers meet the growing demand for biodegradable materials.

WIST: The Right Choice

Look to WIST for expert testing and certification of compostability.
  • ​WIST tests compostability to ASTM D6400 or D6868 standards
  • Testing protocol comprises a disintegration trial, seed germination trial, and biodegradability trial
  • Track record of providing timely, high-quality laboratory services to industry
  • ISO 17025-certified laboratory
  • BPI-certified laboratory
  • Competitive pricing: contact us for project options
Materials tested include:
  • Packaging
  • Bioplastics

For Compostability testing services, contact:

Paul Fowler, Executive Director

Video about WIST compostability testing thumbnailWatch a short video about WIST compostability testing


​​The Federal Trade Commission's "Guides for the Use of Environmental Marketing Claims," commonly called the Green Guides, outline how companies might advertise the environmental attributes of their products. WIST compostability testing helps companies understand the compostability profile of their products. They may make certain claims regarding compostability in their marketing with that information.

Compostable packaging is becoming more important, particularly in the food industry. For one thing, packaging contaminated with food or composed of several different types of material is difficult to recycle. Compostability provides a useful alternative solution.  At the same time, consumers are increasingly aware of environmental impacts, and companies have an opportunity to gain market share by addressing consumer concerns. Compostable materials can be diverted from landfills and the compost put to productive use, yielding a double environmental gain.

Compostability Brochure thumbnailRegulatory change is adding to the demand for biodegradable packaging. Some communities, such as Seattle, have banned from landfills single-use food packaging, napkins, beverage cups, and related items. Those must be composted or recycled. And the push to divert food waste from landfills has created a market for "bio bags" – biodegradable bags used to collect food waste. The bag and food waste can all be tossed in the compost bin.
Paper products typically require additional coatings or other modifications to perform well as food containers, and that affects how well they decompose. Manufacturers are scrambling to develop compostable packaging, but only a handful of labs currently offer testing in the U.S.
WIST's testing protocol is designed to meet US standards for compostability. The testing protocol includes three stages:
  • Disintegration trial
  • Plant seed germination trial
  • Biodegradability trial.
The disintegration trial tests how well the material will break down in a stable environment. The plant germination trial determines how well the material will germinate seeds. Finally, in a biodegradability trial, the material being tested is placed in a sealed vessel, and instruments record the amount of CO2 generated. CO2 is produced during decomposition, and the release of CO2 is then compared to that of cellulose decomposition. Cellulose is what paper and paperboard are typically made of, and provides a baseline for compostability comparison.

BPI Certified Laboratory

Companies whose products pass compostability testing by the Wisconsin Institute for Sustainable Technology may now market those items using the certification logo of the Biodegradable Products Institute (see BPI website for further details on its requirements). The BPI logo assures consumers that the product to which it is affixed has been independently tested and verified as compostable according to scientific standards. Read more about this BPI approval.