EDTA 4Na is white crystal, Used as water softening agents. Items ... Crystal Powder Purity ≥99.0% Ph 10.5-11.5 Fe ≤0.001% Heavy Metal ≤0.002% Calcium Chelated Calue ≥219mgProperty ... , catalysts of synthetic rubber, printing and dyeing adjuvants,detergent adjuvants. EDTA tetrasodium