Calcium nitrate is especially used as flocculants in rubber latex Synonyms: Nitric acid, calcium (II) salt; calcium II nitrate, tetrahydrate (1:two:4); Calcium Nitrate, four-Hydrate; Calcium Dinitrate Applications: Calcium nitrate is principally used as flocculants in rubber latex and refrigerant as cement anti-freezer, phosphorizing agent in steel