Ultra-soft TPVs as EPDM alternative for automotive seals

Teknor Apex has introduced two new Sarlink TPV grades that can be used as an alternative to EPDM foam or sponge in automotive seals, construction weatherstripping, gaskets, and other profiles requiring high resilience for seal integrity. With Shore A hardness levels of 25 and 35, respectively, Sarlink 5725B and 5735B are, according to the company, the softest TPVs available for extrusion and exhibit the lowest compression set.

“The fundamental processing advantages of TPVs over EPDM and other thermoset rubbers include simpler and less costly equipment, elimination of the curing step, faster throughput, and recyclability,” said Ger Vroomen, senior European automotive market manager for TPEs. “In addition, TPVs can be co-extruded with stiff polyolefins for rigidity or attachment requirements or for complex sealing structures, whereas EPDM requires the costly step of encapsulating metal.”

Like other compounds in the Sarlink 5700 Series, Sarlink 5725B and 5735B are formulated for high levels of UV resistance and improved fogging properties.

The company will introduce the new grades at Fakuma.