SLG opens Glasgow facility to produce protein-based BioPro foam

The Scottish Leather Group (SLG) has opened a 75,000ft2 facility in Glasgow to design and manufacture BioPro, its protein-based, recoverable molded foam. The site marks a significant investment in the group’s sustainable interior-materials innovation for multiple transportation sectors, and will enable its Bridge of Weir Leather brand to scale up BioFoam production for global car makers.

A historic Glasgow building, which has been associated with SLG for more than 150 years, has been restored and transformed into a state-of-the-art production site and engineering hub. The building will play a key role in the production of BioPro, a 20% protein-content by-product of SLG’s manufacturing process, which is formulated to replace harmful chemicals such as melamine, bromine, titanium phosphate, graphite and PFAS.

The foam helps automotive manufacturers reduce fossil-based content, improve circularity and lower life-cycle impact. The protein-based BioPro material is recoverable, enabling its components to be reclaimed through an acidolysis process at end of life for potential reuse.

It also offers enhanced flexibility for interior development, allowing seat properties and comfort levels to be fully tailored. BioPro’s engineered consistency and customizable comfort offer greater design freedom to premium and performance-led brands seeking differentiation within the cabin. Each foam is moulded to an exact specification, delivering a precise fit and eliminating the material waste associated with conventional cut foams, which often require multiple parts and increase overall weight.

Originally introduced in the aviation sector by SLG sister company Muirhead, BioPro has already been recognised on the global stage with a nomination for the Earthshot Prize.

Scottish Leather Group CEO Nicholas Muirhead commented, “Our new BioPro facility allows us to take design, engineering and production capabilities to a new level, with our teams operating together in one location to support collaboration and innovation. This investment not only strengthens our manufacturing operations but also creates opportunities within the local community and secures the future of this historic building.

“For decades, we have been proud to support our automotive partners as they work to reduce the environmental impact of their interiors. Following on from new tanning technologies that we introduced in 2024, BioPro is the next step in sustainable seating materials and producing it in a facility shaped by more than 150 years of manufacturing heritage feels fitting.”