Potasium Chloride (Murate of Potash). 1. total potash Content (as k2O)=60% percent by weight minimum 2. Sodium as NaCL (on dry basis)=3.5% percent by weight maximum 3. Moisture= 0.5% percent by weight maximum 4. Particle Size= 95% of the material shall pass through 1.7 mm IS sieve and be retained on 0.25 mm IS Sieve.