Class 019
Non-Metallic Building Material Products
Fire resistant collars (non-metallic -) for pipes; Reinforcing materials, not of metal, for building; Materials of rubber exclusively for building or construction; Non-metallic materials for exclusive use in building or construction; Refractory construction materials, not of metal; Sealants for buildings; Pipes (Rigid-), not of metal (building); Branching pipes, not of metal; Fired refractory materials, not of metal.