Styrenic TPEs offer alternative to PVC, EPDM in window encapsulation

A new series of styrenic thermoplastic elastomer (TPE-S) injection molding compounds provides automotive manufacturers with processing and end use properties that are superior to those of TPE-S materials currently used for window encapsulation, says the supplier Teknor Apex Company (Pawtucket, RI).    

TPE-S being considered as encapsulamt material for rear side windows.

The Sarlink ME-2600 Series includes 55-, 65-, and 75-Shore A compounds that have low specific gravities of 0.93 to 0.94. These specific gravities are comparable to those of TPE-S grades now used in window encapsulation but lower than those of PVC and EPDM, which typically exceed 1.10. "Compared to existing TPE-S materials, the new Sarlink ME-2600 compounds provide higher flow, enhanced surface appearance, improved tensile properties, and greater stability upon heat aging and UV exposure," says the supplier. For example the 65-Shore A grade (ME-2655) possesses tensile strength of 6 MPa, tear strength of 18 kN/m, and ultimate elongation of 500%.

 Teknor Apex can manufacture the Sarlink ME-2600 compounds at its facilities in the U.S., Europe, and Singapore. Sarlink ME-2600 compounds are being evaluated for rear side window encapsulation uses in 2016 models to be built in North America.

The new products provide a valuable alternative in North America, according to Jeff Dickerhoof, senior transportation market manager for the Thermoplastic Elastomer Division of Teknor Apex. "There is a need in North America for a regionally-based manufacturer of TPE-S compounds for window sealing applications who can work directly with local automotive manufacturers to secure OEM approvals," said Mr. Dickerhoof. "The superior cost-performance balance of the Sarlink ME-2600 compounds provides new material options to North American and transplant OEMs. The low specific gravity of these materials compared to EPDM or PVC represents a practical alternative for design engineers looking to achieve the additional weight savings required to meet the stricter emissions and fuel-efficiency standards anticipated for the U.S. market."

Other TPE-S series from the supplier include performance and general-purpose extrusion compounds and injection molding grades for exterior trim, interior components, active grille shutters, and under-hood parts.