Water-based coagulation:
a solvent-free solution for PU substrates

We solved the problem with solvent-based PU coagulation 

Coagulated polyurethane (PU) base materials are used in a range of synthetic leather goods, such as clothing and footwear, fashion accessories and home furnishings. However, many of these materials are developed using the solvent dimethylformamide (DMF), which presents significant environmental and health concerns. 

DMF is classified as a hazardous substance under EU REACH and is subject to stringent restrictions that took effect in December 2023, with specific industrial applications granted transition periods that extend through December 2025. These tightening regulations, together with industry-wide initiatives such as Zero Discharge of Hazardous Chemicals (ZDHC), aimed at safer chemical management, are accelerating the shift toward lower‑impact chemistries.

As a result, the need for low‑ or no‑solvent material solutions is becoming increasingly clear to protect both people and the environment.

How did we redefine coagulation for synthetic leather products?

Stahl has developed PermUCell® a new high-performance 100% water-based solution for PU-coated textiles that balances exceptional performance and high environmental safety standards, using a water-based formulation instead of harmful solvents. The process delivers the same porous, breathable, soft and flexible layer characteristics as conventional coagulated coatings.  

This method is ZDHC- and REACH-compliant and can also reduce water consumption by up to 70%. The technology includes renewable carbon-based solutions that are included in our NuVera® portfolio. These off-the-shelf options are available now for producing high-quality, beautifully coated fabrics in a compliant, consistent and responsible way. 

Why choose water-based coagulation? 

• 100% water-based, enabling cleaner, more sustainable footwear

• Designed for use in a wide range of coated fabrics

• Experience exceptional softness, breathability, and flexibility for next-level comfort

• Future-proof innovation that seamlessly integrates with your existing production lines