... : • It is widely used in the fields like petrochemical industry, machine, electric power, metallurgy, ship-building, medicine, atomic energy, space navigation ... No.NameHDG101Basic typeHDG102With outer ringHDG103With inner ringHDG104With inner &outer ring ® Making materials:Hoop Material / Inner & Outer Ring Materialpacking MaterialOCr13Asbestos Band304SSExpanded Graphite304LSSTeflon ...