Fire-resistant materials made of metal; fire-resistant materials made wholly or principally of metal and/or alloy in the form of ducting, pipes, envelopes, collars, covers, surrounds, screens and sleeves, particularly fire-resistant sleeves as ducting or pipe coverings to inhibit or prevent the spread of fires in ducting or piping systems

Fire-resistant materials (non-metallic); fire-resistant materials being non-metallic in the form of ducting, pipes, envelopes, collars, covers, surrounds, screens and sleeves, particularly fire-resistant sleeves as ducting or pipe coverings to inhibit or prevent the spread of fires in ducting or piping systems