... Fe3.Application: 1)Technical grade: Used in such industries as oil field, paper-making,textile, dyeing, petrochemical industry ... agent in solution for printing,dyeing, and boiler, as diffusant in papermaking; Retarding agent,floating agent, dispersing ... (1% solution) %≤5.8-7.35.8-6.55SolubilityQualifiedQualified6Heavy metals, as Pb %≤ 0.0017Arsenic, as As%≤ 0.00038Fluoride as F%≤ 0.0039Water insoluble ...