Can you sell co-product chemicals for use as fuels? In some cases, the answer is yes. If your co-product was a non-hazardous waste, then you can sell it as a fuel so long as the requirements of 40CFR241 are met. If the co-product was a hazardous waste, then you will have to meet the requirements of 40CFR261.2. Generally, hazardous materials that are fuels or fuel ingredients themselves are not solid wastes. For further information on whether you can sell a co-product as a fuel, please email us.