Sodium Sulfhydrate
Sodium Hydrogen Sulfide
- CAS
- 16721-80-5
- EC
- 240-778-0
- Sectors
- Textiles, Leather & Paper, Mining & Metals, Water & Wastewater Treatment
Sodium Sulfhydrate (CAS 16721-80-5) is the sodium salt of hydrogen sulfide, a Technical Grade off-white solid with a pungent odor that serves leather tanning, dyes manufacturing, pulp processing, ore flotation and wastewater treatment. Density 1.79 g/cm³, melting point 350°C (decomposes); soluble in water releasing H2S, pungent odor.
Typical Properties
| Molecular formula | HNaS |
|---|---|
| Molecular weight | 56.06 g/mol |
| Appearance | white crystals or powder with a very unpleasant smell |
| Form | Solid |
| Color | Off-white |
| Melting point | 350 °C |
| Density | 1.79 g/cm³ |
| Water solubility | 620 g/L (20 °C) |
| Flash point | 90°C |
| GHS signal word | Danger · Flammable, Corrosive, Acute toxicity, Irritant / harmful, Health hazard, Environmental hazard |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Sodium Sulfhydrate
Applications
Used in leather tanning for dehairing, dyes manufacturing, pulp processing, mining for ore flotation, and wastewater treatment.
Safety & Risks
Corrosive, toxic if swallowed or inhaled; releases H2S gas with acids. Flammable; Hazard Class 8/4.2; use PPE, ventilation.
Packaging
In 25kg iron drums or bags with liners; rinse triply for recycling or puncture for disposal.