Specifications include, but are not limited to: Type: Shall be Sodium Chloride Type “A” crushed rock salt, to be used for removal of snow and ice. Chemical Composition: Shall be not less than 95% sodium chloride. Percent of sodium chloride shall be determined in accordance with current ASTM-D-632. Size Grading: The salt, when tested, using sieves as described in ASTM-C-136 (*1) shall conform to the following requirements for particle size distribution: Sieve Size Percent Passing (*2) ½” – (12.5 MM) 100 3/8” – (9.5 MM) 95 – 100 No. 4 – (4.75 MM) 20 – 90 No. 8 – (2.36 MM) 10 – 60 No. 30 – (600 MICRONS) 0 – 15 (*1) A drying temperature of 110°C ± 5°C may be used. (*2) Tolerance of (±) 5% on each sieve except ½” and 3/8” sizes, on which no tolerance will be allowed. Moisture Content: Moisture content upon delivery shall not exceed 1-1/2%* when determined as follows: % Moisture = (W¹ - W²) x 100 (W¹) W¹ = initial weight of sample W² = weight of sample after drying to a constant weight at 110° ± 5°C
