Bridge of Weir Leather has unveiled BioPro, a next-generation, protein-based molded seat foam that offers a lower-impact alternative to traditional foam.
BioPro contains 20% protein-content, a by-product of the Scottish Leather Group’s (SLG) manufacturing process and is formulated to replace harmful chemicals such as melamine, bromine, titanium phosphate, graphite and PFAS. SLG owns the Bridge of Weir brand.
With a base density starting at 47kg/m³, BioPro can reduce weight while maintaining comfort and durability. Its natural intumescent, fire-resistant properties help manufacturers meet automotive safety requirements without additional fire-retardant treatments.
The protein-based BioPro is a circular, sustainable material. At the end of the foam’s life in a car, the material can be recovered through an acidolysis process, creating future potential for its constituent elements to be reused.
It also improves flexibility in interior design, enabling seat materials and comfort levels to be customized. Each foam piece is moulded to precise specifications, ensuring an accurate fit and reducing the material waste common with conventional cut foams, which often require multiple parts and can increase overall weight.
Originally launched for the aviation sector by Muirhead, a sister company within SLG, BioPro has already been recognized on the global stage with a nomination for the Earthshot Prize.
SLG CCO James Muirhead commented, “For decades, we have been proud to support our automotive partners as they work to reduce the environmental impact of their interiors. BioPro is the next step in that journey. It reflects years of commitment from our innovation team and a shared ambition with our customers to move away from fossil-derived content while maintaining the quality and comfort they expect.
“Developing more responsible material solutions is a key priority across the group, as demonstrated by the new tanning technologies that we introduced in 2024. With BioPro being fully recoverable at end of life, it enables new pathways for seat components without compromising durability. It represents a meaningful advancement in supporting more sustainable automotive interiors.”
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