Specifications include, but are not limited to: TREATED rock salt is a mixture of Regular Road Salt, Type I, Grade I, ASTM-D-632 - Modified per Mn/DOT Specification listed below, blended with a Mn/DOT approved magnesium chloride-based product for anti-icing or deicing use or an approved blend of Regular Road Salt and a magnesium Chloride based product. The magnesium chloride based product will also contain an agricultural processing residue or an alternative Mn/DOT approved agent that will depress the effective working temperature and decrease corrosiveness of the overall compound as well as prevent leaching of the treating solution. Agriculture Processing Residue Products (APRP) is the concentrated liquid residues from the processing of grains and other agricultural products. They are derived from the processing of agricultural raw materials, primarily corn and beets. The liquid residues are typically combined with chloride solutions and/or rock salt and the resulting mixture is applied to road surfaces and bridge decks for the purpose of anti-icing or de-icing.
