Sodium sulfide is the chemical compound with the formula Na2S, or more commonly its hydrate Na2S·9H2O. Both are colorless water-soluble salts that give strongly alkaline solutions.
Chemical formula：Na2S
Molar mass： 78.0452 g/mol (anhydrous)/240.18 g/mol (nonahydrate)
Appearance：colorless, hygroscopic solid
Odor：rotten eggs
Density：1.856 g/cm3 (anhydrous)/1.58 g/cm3 (pentahydrate)/1.43 g/cm3 (nonohydrate)
Melting point：1,176 °C (2,149 °F; 1,449 K) (anhydrous)/100 °C (pentahydrate)/50 °C (nonahydrate)
Solubility in water：12.4 g/100 mL (0 °C)/18.6 g/100 mL (20 °C)/39 g/100 mL (50 °C) (hydrolyses)
Sodium sulfide is primarily used in the kraft process in the pulp and paper industry.
It is used in water treatment as an oxygen scavenger agent and also as a metals precipitant; in chemical photography for toning black and white photographs; in the textile industry as a bleaching agent, for desulfurising and as a dechlorinating agent; and in the leather trade for the sulfitisation of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of rubber chemicals, sulfur dyes and other chemical compounds. It is used in other applications including ore flotation, oil recovery, making dyes, and detergent. It is also used during leather processing, as an unhairing agent in the liming operation.
VI HALBLEITERMATERIAL GmbH (VIMATERIAL) employs a stringent quality assurance system to ensure the reliability of our product quality. Strict quality control is implemented throughout the entire production chain, and for defective products, we strictly enforce the principle of rework and redo. Each batch is released only after passing detailed specification tests.
Every batch of our materials is independently tested, and, if necessary, we send samples to certified companies for testing. We provide these documents and analysis certificates with the shipment to certify that our products meet the required standards.
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