Expanded PTFE/Graphite with Aramid Corners CONSTRUCTION Special high performance packing of Aramid yarns corners and expanded PTFE Graphite fibre yarns at the running surface. APPLICATION / SERVICE WGS Style 798 packing can handle a broad range of chemicals in the 3-11 pH range. It is used in papermill stock pumps, agitators, or any service where high strength and good lubricating qualities are needed.