17 materials for packing seals, pumps and valves, namely, ptfe, graphite, silicone rubber materials, fibrous glass and copper yarns and articles for packing seals fabricated from combinations thereof; materials for packing pistons, namely, plastics and rubber materials and articles for packing pistons fabricated therefrom; materials for jointing, namely, compressed fibre, plastics and rubbers and articles for jointing fabricated therefrom; materials for sealing joints, namely, metals, plastics, ptfe, rubber and other elastomers; materials for vibration insulating purposes, namely, plastics, rubbers and elastomers and articles for vibration insulation fabricated therefrom; materials for thermal insulation, namely, fibrous glass lagging and plastics tape; plastics materials in the form of gaskets, seals and O-rings; flexible connections and pipes; articles made from synthetic rubber, namely, gaskets, [ grommemets ] *grommets* tubes, pipes and sheeting