... Crystal, easily soluble in water. 2) Purity: 99.5%Min. Formula: NaNO3. Formula:NaNO3M.W.:84.99(According to Intermational Atomic Weight in 1995 ... items are superior to the National StandardNaNO3(on bry base),%99.5minChlorides(as CL,on bry base),%0.15maxNaNO2(on bry ... .03maxFe%0.005maxWith anti-coking agent in need sodium nitrate 99.5%min