17 Rubber, gutta-percha, gum, asbestos, mica and substitutes for all these materials; packing, stopping and insulating materials; insulating plaster; insulating materials; insulating paints; insulating varnish; plastic films (other than for wrapping), insulating tapes, adhesive sealant compounds and other sealing compounds; foams and semi-processed foams; mineral wool (used as insulating material); flexible pipes, tubes and hoses, not of metal; all the afore goods mainly used for insulation, absorption and acoustic optimization purposes.