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.
plastic sheet materials for construction and general use; plastic mesh sheet materials for construction of civil engineering structures
19
Building materials (non-metallic); non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal.
reinforcing materials not of metal for building purposes, namely, plastic mesh materials for asphalt and concrete reinforcement, and construction of civil engineering structures, reinforcing materials not of metal for building purposes, namely, soil reinforcement mesh and soil stabilization mesh made of plastic; reinforcing materials not of metal for building purposes in the nature of erosion control plastic mesh, mats and sheeting, not of metal; reinforcing materials not of metal for building purposes in the nature of plastic building mesh and plastic film for use in civil engineering, for the purposes of drainage, stabilizing inclines, recultivation, plant support, absorption, filtration, separation, stabilization and reinforcement of the soil, for use in connection with road construction, railroad construction, tunnel construction, waterway construction, runway construction, levee construction, and public works construction, for nurseries, greenhouses and landscaping, fencing, penning and enclosing livestock fields and pastures, and construction of civil engineering structures