Sodium nitrate is 1.used in azodyestuff,bleaching agent, 2.metal heat ... nitrate , azodyestuff, dye mordant in textile coloration, bleaching agent, metalheat treatment auxiliary agent, and antispetic in pharmaceuticalindustrySpecification:Assay (on Dried basis): 99.% Min ... ): 0.1% Max.Iron (As Fe): 0.005% Max. Sodium nitrate