- ▸ Leather: Dehairing agent for hides
- ▸ Pulp and paper: Kraft pulping and rayon desulfurizing agent
- ▸ Dyes: Intermediate for sulfur-containing dyes
- ▸ Mineral processing: Flotation reagent and copper depressant
- ▸ Water treatment: Reducing agent for effluent and metals
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.
Sodium hydrosulfide (CAS 16721-80-5, NaHS), an inorganic sulfur salt supplied as flakes or solution. Used to dehair hides in leather processing, as a pulping and desulfurizing agent in pulp, paper, and rayon production, in the manufacture of sulfur dyes, and as a flotation reagent and copper depressant in ore processing.
Frequently Asked Questions
What is sodium hydrosulfide used for?
Sodium hydrosulfide (NaHS, CAS 16721-80-5) is used to dehair hides in leather processing, as a pulping and desulfurizing agent in pulp, paper, and rayon production, as an intermediate for sulfur dyes, and as a flotation reagent and copper depressant in ore processing. It also serves as a reducing agent in effluent and metals treatment.
What is sodium hydrosulfide made from / how does it react with water?
It is an inorganic sulfur salt (formula HNaS) commonly produced by reacting hydrogen sulfide with sodium hydroxide. It is supplied as flakes or as an aqueous solution and is highly water-soluble. Consult the SDS for handling, storage, and incompatibility data before use.
Is sodium hydrosulfite a bleach? How is it different from sodium hydrosulfide?
No — these are different chemicals. Sodium hydrosulfite (dithionite) is a reducing/bleaching agent, while sodium hydrosulfide (NaHS) is a sulfur salt used in leather, pulp, dye, and mineral-processing applications. Confirm CAS 16721-80-5 when specifying sodium hydrosulfide to avoid cross-substitution.
What is the HS code and UN number for shipping sodium hydrosulfide?
The solid is classified under HS 2830.10 (sodium sulfides) and ships as UN 2318, Sodium Hydrosulfide, Solid, with less than 25% water of crystallization. Confirm the correct DOT/IMDG entry for the specific physical form (solid vs. solution) you are ordering.
How is bulk sodium hydrosulfide supplied and quoted?
It is available as flakes or as solution in drums, IBCs/totes, and bulk for industrial users. Provide your required form, concentration, and quantity to receive a bulk quote with a Certificate of Analysis and SDS.