19 Non-metallic tiling aids composed predominately of plastics, namely, sealing, watertight, decorative and protective edging strips for use with tiles; plates, strips, extrusions, shaped sections, edging strips, sealing strips, mouldings, fabrications, pressings, decorative and protective edges and strips, beading, all being building materials made of plastics or predominantly of plastics and adapted for use with tiles, flooring, drywall systems and worktops; sealing materials made of plastics or predominantly of plastics and adapted for use with tiles, flooring, drywall systems and worktops