LIQUID CHEMICAL COMPONENTS WHICH REACT TO FORM URETHANE PRODUCTS-NAMELY, WHEELS, TIRES, CONVEYOR ROLLERS AND OTHER COMPONENT PARTS OF CONVEYING SYSTEMS, SEALS, PUMP HOUSINGS, BUMPERS, DECORATIVE ITEMS, SPROCKETS, HAMMERS, IMPELLERS, SHOES, SHOE SOLES, SURFACE COATINGS, AND TANK LININGS