17
Rubber, gutta-percha, gum, asbestos, mica and goods made from these materials and not included in other classes; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, not of metal.
high temperature, fire-proofing and insulating materials in sheet, block, and panel form for use on columns, beams, grease ducts, vessels, skirts, saddles, tanks, walls, bulkheads, air and exhaust ducts, cable trays, chimneys, refractory backups, and other applications requiring fire ratings or high temperature insulation