Specifications include, but are not limited to: These specifications cover rock salt for ice removal. 2. DESCRIPTION. Rock salt used for ice removal shall be produced by crushing natural deposits of sodium chloride. Material produced by recrystalization of salt solutions will not be accepted. 3. CHEMICAL COMPOSITION. The rock salt shall conform to the following requirements as to chemical composition: Sodium chloride (as NaCl), Minimum percent 95.0% 4. GRADING. The rock salt shall conform to the following gradation requirements as determined by laboratory sieves (U.S. Standard Sieve Series): Sieve Designation Percent Passing 3/8 inch 100 No. 4 85-100 No. 8 15-35 No. 30 0-15 5. PACKAGING AND MARKING. The rock salt shall be delivered in bags or sacks containing not more than 50 pounds each or in bulk when requested. When delivery is made in bags or sacks, the name of the manufacturer and net weight shall be legibly marked on each container. The percentage of sodium chloride guaranteed by the manufacturer shall be noted on the shipping report or legibly marked on the containers. When delivery is by bulk, the manufacturer shall furnish certified analysis giving sodium chloride content of the rock salt furnished
