Sodium chloride (Super-D, Met-L-X, M28, Pyrene Pyromet[a]) contains sodium chloride salt, which melts to form an oxygen-excluding crust over the metal. A thermoplastic additive such as nylon is added to allow the salt to more readily form a cohesive crust over the burning metal. Useful on most alkali metals including sodium and potassium, and other metals including magnesium, titanium, aluminum, and zirconium. Do not use with lithium fires as lithium can react with NaCl to form LiCl and Na which will continue burning.
