Certified Compostable by the BPI (Biodegradable Products Institute) Meets ASTM D6400 and EN 13432 Standard Specifications for Compostable Plastics. Strong and sturdy design Engineered to handle temperatures up to 190 F (87 F). Made from annually renewable resources 94% Biobased as measured by ASTM D6866. Does not contain any polypropylene, polystyrene, or any other conventional plastics that do not biodegrade. Natur-ware compounds from Ingeo natural plastic are made from plants not oil. Each piece of Natur-Ware cutlery is identified as compostable.