S 2168 (OTTO) Sodium nitrite, 99.999% Cas 7632-00-0 - used in many industrial applications viz. in meat curing, coloring and preserving. S 2168 (OTTO) Sodium nitrite, 99.999% Cas 7632-00-0 - used as a reagent in analytical chemistry, an antidote in cyanide poisoning, an electrolyte in electrochemical grinding, as a cooling solution in closed loop systems and as an additive in industrial greases.