19 BUILDING MATERIALS OF PLASTICS CONTAINING INORGANIC MATERIALS, NAMELY, RIGID PIPES AND DUCTS NOT OF METAL, AND THEIR PARTS AND FITTINGS IN THE NATURE OF INSULATION, COLLARS, AND SUPPORTS; BUILDING MATERIALS OF PLASTICS CONTAINING INORGANIC MATERIALS, NAMELY, JOINING PANELS, BEADING PANELS, WALL AND CEILING PANELS, FLOORING PROFILES AND SHEETS; BUILDING MATERIALS FOR FIRE PROTECTION, NAMELY, RIGID PIPES AND DUCTS NOT OF METAL, AND THEIR PARTS AND FITTINGS IN THE NATURE OF INSULATION, COLLARS, AND SUPPORTS; BUILDING MATERIALS FOR FIRE PROTECTION, NAMELY, JOINING PANELS, BEADING PANELS, WALL AND CEILING PANELS, FLOORING PROFILES AND SHEETS; BUILDING MATERIALS, NAMELY, PIPES AND SHEET WHICH FORM A CERAMIC UNDER FIRE CONDITIONS; INJECTION MOULDED BUILDING MATERIALS, NAMELY, FITTINGS FOR RIGID PIPES AND DUCTS NOT OF METAL, AND SPACERS; SURFACINGS FOR BUILDINGS, NAMELY, WALL CLADDING, WALL PANELS, AND ROOFING MEMBRANES; CEILING AND ROOF TILES OF PLASTICS; BUILDING MATERIALS OF COMPOUNDED PLASTICS MATERIALS, NAMELY, RIGID PIPES AND DUCTS NOT OF METAL, AND THEIR PARTS AND FITTINGS IN THE NATURE OF INSULATION, COLLARS, AND SUPPORTS WHICH FORM A CERAMIC UNDER FIRE CONDITIONS; BUILDING MATERIALS OF COMPOUNDED PLASTICS MATERIALS, NAMELY, JOINING PANELS, BEADING PANELS, WALL AND CEILING PANELS, FLOORING PROFILES AND SHEETS WHICH FORM A CERAMIC UNDER FIRE CONDITIONS