EDAC’s Waterproof D-Sub series are all manufactured with a single piece steel shell with dimples on the plug. Insulator materials are made with PBT thermoplastic, 30% glass filled, and both the insulator and frames have a flammability rating of UL 94 V-0. That standard classifies plastics according to how they burn in various orientations and thicknesses. UL 94 V-0, means burning stops within 10 seconds on a vertical specimen and drips of particles are allowed as long as they are not inflamed. The O-ring is made from silicone and the sealant is made of epoxy. Signal contacts have full gold flash plating, and are made of copper alloy and the High Power contact is made of copper alloy.