CAMBRIDGE, Mass.--(BUSINESS WIRE)--Metabolix, Inc. (NASDAQ: MBLX), an innovation-driven bioscience company focused on delivering sustainable solutions for plastics, chemicals and energy, today announced that I6001, a biobased polymeric modifier for PVC (polyvinyl chloride) formulations based on Metabolix PHA resin, is now available for shipment to customers. Metabolix designed I6001 as a performance additive to improve the mechanical and environmental performance characteristics of PVC. With a diverse use pattern ranging from construction materials to medical applications, PVC has an estimated market demand of approximately 35 million metric tons per year.