Profile: Del sealing Technology Co,.Ltd. designs and manufactures of O-rings, O-ring cords, custom molded rubber seals, rubber extrusion and PTFE parts. Our proprietary compounds are designed to perform in a wide rang of applications with varying chemical exposures, pressures and temperatures. Our O-ring cord is supplied as a continuous extruded cord. Our range includes virgin PTFE and mixes of carbon, graphite and glass filled PTFE compounds.