DEARBORN, Mich. (Nov. 26)—In a new marketing approach, Solvay Engineered Polymers is pitching its Sequel and DexFlex thermoplastic olefins for the carrier on the inner and outer belt line seals. Typically, the carriers of thermoplastic vulcanizate seals are made of rigid polypropylene. As the seal materials move to thermoplastic elastomers, designers must engineer in the thermal expansion of the seal and carrier. Solvay's TPO materials exhibit less expansion over a broad temperature range, the company claims, making shrinkage less of an issue. With its TPOs, TPVs, slip coats and gloss coats, Solvay claims to be the first materials supplier to market an entire sealing material package. The supplier already has General Motor Corp.'s approval to use its TPO materials in carrier applications and now is beginning testing with at least half a dozen Tier 1 and 2 suppliers.