Blocks made of concrete; Blocks made of non-metallic materials for building purposes; Non-metallic building blocks; Casements, not of metal; Construction materials, not of metal; Fire retardant materials for building purposes; Fireproof seals in the nature of building materials; Non-metallic building bricks; Non-metallic building components; Non-metallic building materials for fire protection; Non-metallic building materials in the form of blocks; Non-metallic fire protection materials for preventing the spread of fire in buildings; Non-electric ducting conduit installations of non-metallic materials; Non-metallic fire protection screenings for electric cables; Non-metallic fire protection screenings for electric ducts; Non-metallic fire protection sleeves for use in pipe ducts; Constructional members of aerated concrete for use in building