Bridge of Weir Leather has introduced BioPRO, a new kind of protein-based molded seat foam designed to offer a lower-impact alternative to traditional polyurethane foams. The material incorporates 20 per cent recovered protein sourced from the Scottish Leather Group’s manufacturing byproducts, reducing reliance on fossil-derived inputs and supporting a more circular materials strategy.
Advantages include:
- Cleaner chemistry: BioPRO eliminates the need for conventional flame-retardant additives uch as melamine, bromine, titanium phosphate, graphite, and PFAS, while still meeting automotive fire-safety requirements thanks to its naturally intumescent, fire-resistant behavior.
- Low mass: with base densities starting at 47 kg/m3, the foam enables weight reduction without compromising comfort or durability.
- Circularity: at end of life, BioPRO can be fully recovered through acidolysis, supporting closed-loop recycling and lowering overall lifecycle impact.
- Durability: Traditional synthetic foams degrade internally over time, but BioPRO is engineered for long-term structural stability and consistent seating performance.
BioPRO is now being offered to automotive customers through Bridge of Weir, whose client base includes Aston Martin, McLaren, Jaguar Land Rover, and Polestar. This expansion follows earlier success of the material in aviation applications and recognition through a nomination for the 2025 Earthshot Prize.
