purchase of heavy chemical . , purchase of heavy chemicals..: , phosphoric acid h3p04 = 85%, p2o5 = 61.5% ph – 1.5 ( 0.1 nag-solution ) , sp. gravity – 1.60 – 1.68, quality – food grade ( make gacl, nirma, birla ) , scale softner residual mass ( at 1050c ) % by mass 75-85, ph – 10-11.5, bulk density 9 / cm3 – 0.95-1.15 ( make nki organics, ubc, poly chem ind. ) , soda ash. purity as na2co3%by mass 95-98% ( make- tata / modi / dcw / gacl ) , blaching powder make tata, modi, dcw, shriram 33% available chlorine , ammonium b-1 floride nh4hf2 = 98.5% mini. , alum 1 alum block in 25 kg. weight, al2o3 not less than 17% in alum solid block