Heritage-Crystal Clean, Inc. is a provider of parts cleaning services in the United States-based, and a provider of containerized waste services that focuses on small and mid-sized customers. The Company offers an integrated suite of industrial and hazardous waste services, including parts cleaning, containerized waste management, used oil collection and vacuum truck services. It has implemented two different programs whereby its customers’ used solvent may be excluded from the United States Environmental Protection Agency’s (EPA’s) definition of hazardous waste. In its product reuse program, it sells used solvent as an ingredient for use in the manufacture of asphalt roofing materials. In its non-hazardous program, it provides its customers an alternative parts cleaning solvent not included in the definition of hazardous waste due to its increased flashpoint (the minimum temperature, at which vapors from the solvent will ignite when tested under specified laboratory conditions). (Source: 10-K)