This specification covers requirements for the compound and physical characteristics of rubber floor tile. The polymeric binder of the rubber floor tile shall have been vulcanized such that it becomes thermoset. The rubber floor tile made from this compound shall be resistant to neutral pH cleaners. For homogeneous rubber floor tile, the surface coloring or mottling shall be uniform throughout the entire thickness of the rubber floor tile. For layered rubber floor tile, the surface color or mottling need not extend through the entire thickness of the rubber floor tile, but must extend throughout the entire thickness of the wear layer. The material shall be tested for heat resistance, abrasion resistance, dimensional stability, and light resistance.