Dennard door seals are a combination of co-extruded flexible and rigid PVC utilizing special technology that fuses the molecules to create a bond of the flexible to the rigid retainer in a single piece. The seals are designed to offer an optimum performance which will exceed the desired thermal insulation and air tightness.Used in the sealing of container Doors for Refrigerated and non refrigerated containers and containerized Transport Vehicles. Ozone and UV resistance, Non-cracking, long life and thermal insulation are the key features of this product. Temperature resistance from -40 ° C to + 70 ° C .