All compostable products should be certified as conforming to ASTM or other international standards in order to prevent greenwashing, and to ensure that the products do not create problems for composters or the environment. Meeting the ASTM standards (D6400 or D6868) requires individual ingredients to be tested for biodegradability (consumed by microorganisms), and the finished product to disintegrate (physically break down during composting), as well as be tested for plant toxicity and heavy metals. Certification in the U.S. is provided by BPI, The Biodegradable Products Institute.
LABELING IS KEY
To help prevent greenwashing and help compostable product providers clearly identify their products, the USCC, under the guidance of a Compostable Products Task Force, has produced several key resources.
Labeling Guidelines for Compostable Plastics
Compostable Food Serviceware Quick Guide
Model Compostable Labeling Legislation
https://www.compostingcouncil.org/page/CompostableProducts