Specifications include, but are not limited to: This specification covers rock salt for use in snow and ice removal and various other purposes. 2.0 MATERIALS: 2.1 Standard Specification for Sodium Chloride: The standard specification for sodium chloride is the American Society for Testing and Materials Specification D632-84, or revision thereof. 2.2 Gradation: The rock salt shall comply with the following gradation requirement: Weight Percent Passing Medium Salt ASTM Type I Fine Salt Sieve Size Grade 1 ASTM Type II ?" 100 No 3/8" 95 to 100 Gradation No. 4 20 to 90 Requirement No. 8 10 to 60 No. 30 0 to 15 2.3 Caking Retardant: The rock salt shall be treated with sodium ferrocyanide so as to contain a minimum of 25 ppm. Sodium ferrocyanide is also known as yellow prussiate of soda or YPS.
