Common Name: Sodium benzenesulfinate English Name: Sodium benzenesulfinate CAS Number: 873-55-2 EINECS: 212-842-8 Molecular Formula: C6H5NaO2S Molecular Weight: 164.158 Density: 0.8 g/cm3 Boiling Point: 339.4°C Melting Point: 300°C Flash Point: 159.1°C Appearance: White or light yellow flaky crystals. Solubility: Soluble in water, forming a weakly alkaline solution. Uses: 1. Used as a polymerization adhesion enhancer and plasticizer for polyamide, epoxy resin, and phenolic resin plasticization and modification. 2. Used as an analytical reagent. 3. Serves as a primary brightener in bright nickel plating. It significantly reduces the grain size of the nickel plating layer, imparting brightness and good ductility to the coating. The typical dosage is 0.1–0.3 g/L. 4. Sodium benzenesulfinate is an intermediate in the Martel method for producing chrysanthemic acid and can also function as a photographic reducing agent. 5. This chemical is specifically manufactured for the photographic, pharmaceutical, and electroplating industries. 6. Used in microcrystalline analysis for the determination of potassium.