Toyota is using DuPont’s Sorona bioresin in its Prius hybrid vehicles Toyota is raising the environmental credentials for its family of Prius hybrid vehicles, using DuPont’s Sorona bioresin for parts on the instrument panel air conditioning system outlet. Sorona contains between 20-37% resin sourced from renewable plant sugar. The new material being used on Toyota’s Prius A car is similar to petroleum-based polybutylene terephthalate. The Prius A – the “A” stands for alpha – is a family sedan version of the Prius, being sold only in Japan. DuPont worked with Toyota, moulder Kojima Press Industry and film producer Howa Plastics – all based in Toyota City, Japan – to develop the Sorona material for the Prius A. The instrument panel part controls the intensity and direction of air flow and had to meet Toyota requirements for heat resistance and durability, DuPont said.