TricorBraun Flex spent over two years in developing the Biotre Film, an earth-friendly, heat sealable, barrier material. Biotre Film is made from 60% (by weight) renewable wood pulp. The wood pulp portion is biodegradable. Third party testing per ASTM tests D-6868 and D-6400 confirmed that nearly all of the wood pulp portion will disintegrate into healthy compost over 84 days in a backyard, home composting environment. The remaining 40% (by weight) of the bag is Polyethylene (PE) with an additive that is designed to make it disintegrate significantly faster than standard plastic.