BS EN 17228:2019 pdf free.Plastics - Bio-based polymers, plastics, and plastics products - Terminology, characteristics and communication. 4 Bio-based content and bio-based carbon content determination 4.1 General A bio-based plastic is one which is wholly or partly derived from biomass. In particular when the product is partly bio-based, it is essential to quantify the amount of biomass (i.e. the bio-based...