Concrete formwork; Concrete shuttering; Construction elements of plastic; Structural elements of plastic; Non-metallic formwork for concrete; Plastic mouldings for building construction; Polystyrene in situ moulds for concrete flooring; Non-metallic formwork; Building materials of plastic material; Building materials, not of metal; Non-metallic building materials; Non-metallic building materials for civil engineering; Non-metallic building materials in the form of blocks; Non-metallic building materials in the form of shaped sections; Non-metallic building materials in the form of slabs; Partitions being non-metallic building materials