Egyptian winter road treatment marine salt Composition: NACL Color: white. Near the industrial salt color and specification. Average composition: Nacl : from 97.0 to 98.0 % Mgso4: from 0.50 to 0.20 % Caso4: from 0.50 to 0.20 % Mgcl2: from 0.40 to 0.20 % Moisture: from 3 to 5 % depending on weather condition Insoluble: from 1 to 2 %.