The Performance Polymers business of DuPont (Wilmington, Delaware / USA; www.dupont.com) has introduced two materials to meet demand for materials that can withstand long-term exposure to heat and gases in turbo-charged automotive environments.

“Zytel” LCBM6301 is a long-chain blow moulding PA 6.12 grade with improved acid and thermal resistance compared with flexible PA 6 and better thermal resistance than PA 12, the company said. It has been developed for use in flexible automotive air ducts, positive crankcase ventilation tubes, and exhaust gas recirculation sensor tubes. The grade offers improved durability and can operate in the more aggressive temperatures and gases generated by compact turbo charged diesel and petrol engines, while helping to meet CO₂ and NO_x emissions limits.

“Hytrel” HTR8797 TPC-ET is a flexible, blow-mouldable resin that more than doubles the 130°C to 150°C air oven ageing durability of previous Hytrel grades specified for cold side blow moulded auto air duct applications.