Shaft size: 12mm, 16mm, 22mm Seal material: tungsten carbide, silicon carbide, carbon, 304SS, 316SS, EPDM, ... under negative pressure and pump downSpeed: Up to Material SelectionDescriptionMaterialBT1FaceTungsten SpringCrNiMo - steel Secondary sealButyronitrile Rubber Ethylene propylene ... steel CrNi- steel CrNiM-steel 1. Preferred Material.2. Optional Material. It is determined according to the actual ...