Covestro and puren continue to jointly advance the functional material purenit – with the inauguration of new production line at the Obermarchtal site in Germany, puren has now certified its entire purenit production to the ISCC PLUS standard.

Polyurethane residual materials used to produce purenit at the newly ISCC PLUS certified site in Obermarchtal.

This certification lays the groundwork for puren to use Desmodur CQ MS from Covestro as a binder, forming the basis for the next step in improving the environmental footprint of purenit.

At the inauguration event, puren announced a first product built on this basis, with market launch planned for 2027.

purenit: A material made from residues

purenit is a highly compressed functional material based on rigid polyurethane foam (PUR/PIR) with a density of around 550 kg/m³. Despite its low weight, it is pressure-resistant, moisture-resistant and dimensionally stable, provides reliable insulation, and can be sawed, milled, drilled and glued with standard woodworking machinery.

It is produced using an adhesive-press process in which polyurethane residual materials are processed into homogeneous boards. This upcycling approach, turning a byproduct of PU production into a standalone, high-quality material, is unique in the insulation industry in this consistency.

purenit is ideal as core material for windows, doors, facades and base areas in construction, for bathrooms, wellness areas and outdoor kitchens, and for interior fit-out in motorhomes, commercial vehicles and ships.

ISCC PLUS certification for more sustainability

The use of Desmodur CQ MS relies on the mass balance approach: bio-circular feedstocks are physically blended in at an earlier stage of production and then mathematically allocated to the final product.

ISCC PLUS independently verifies this allocation across the entire supply chain. Only full certification of purenit production to this standard allows puren to correctly represent the bio-circular raw material and the associated improvement in sustainability.

Collaboration across the value chain

Covestro supplies Desmodur CQ MS, a raw material with a reduced carbon footprint, and puren processes it into a material that itself is built on the recovery of PU residual materials. The result is a product that benefits from circular thinking at two points in the value chain: the raw material and the material concept itself.

For the polyurethane industry as a whole, this example shows that circular economy is already reflected today in certified, market-ready products.