Gum, raw or semi-worked; Non-metallic stuffing rings; Stuffing rings, not of metal; Flexible tubes, not of metal; Non-conducting materials for retaining heat; Insulating materials; Insulating tape and band; Waterproof packings; Caulking compounds for sealing cracks; Joint sealing compounds; Materials (preparations) for sealing; Non-metallic sealing strips; Artificial resins (semi-finished products); Synthetic rubber