... , color picture tubes, drugs, chemical reagents, catalysts, ceramic glazes, glass, fertilizer, and flowers, vegetables, fruit trees and other cash crops spraying ... %≤0.10%Sulfate ( SO42-)≤0.003%≤0.005%≤0.005%---Moisture absorption≤0.20%≤0.25%≤0.25%---Iron(Fe ) content≤0.001%≤0.003%≤0.003% Potassium (K2O) content---------≥46.0 ...