The first biodegradable closures for beverage bottles have been made from a compostable thermoplastic - Mater-Bi produced by Novamont. Tests have shown that these new closures, namely BioCap®, exhibit oxygen permeation rates comparable to those of conventional high-density polyethylene caps. They are compliant with the European Union environmental directive 2002/95/EC on the Restriction of the use of certain Hazardous Substances (RoHS).
Swiss firm Wiedmer AG and the German drugstore chain Ihr Platz have joined forces to commercialize the first biodegradable closure for beverage bottles. In fact Wiedmer AG has designed an innovative closure based on a 3.6 gram cap with tamper-evident ring.