19 Non-metallic building materials, in particular, light-weight materials composed of perlite sand, obsidian sand, expanded granulate, expanded granulate made of perlite sand or expanded granulate made of obsidian sand, plaster and/or mortar; non-metallic building materials, in particular, light-weight materials composed of insulation panels, stuck parts, light-weight concrete, light-weight plaster for interior use, light-weight plaster for exterior use, light-weight mortar, brick backfilling, plasterboards, fibre cement, tile glue, putty, grout; non-metal refractory building materials, namely, fireproof light-weight materials composed of perlite sand, obsidian sand, expanded granulate, expanded granulate made of perlite sand or expanded granulate made of obsidian sand, plaster and/or mortar; non-metal refractory building materials, namely, fireproof light-weight materials composed of fire protection boards, fire protection plaster, firebreak doors