... metallurgy, petroleum, chemical industry, textile, papermaking, print Specifications: 1) NaOH: 99% min; 96% min2) Na2CO3: 0.7% max; 1.4% max3) NaCL ... ) Fe2O3: 0.01% max; 0.01% maxParticle size for pearl 99%:1) +mesh 16: 7% max2) +mesh 60 -mesh 16: 87 ...