Sodium Hydrogen Sulphate
SBS, Sodium Bisulphate, Nitre Cake, Sodium Acid Sulphate.
- CAS
- 7681-38-1
- EC
- 231-665-7
- Sectors
- Water & Wastewater Treatment, Home Care & Industrial Cleaning, Mining & Metals
Sodium Hydrogen Sulphate (CAS 7681-38-1), also known as sodium bisulphate or nitre cake, is a dry acid supplied as white pearls or off-white granules that maintains strong acidic properties in aqueous solution, and it is used for pH adjustment in pools, spas and industrial wastewater, metal pickling and descaling cleaners. It provides a safer, more manageable alternative to liquid mineral acids while maintaining strong acidic properties in aqueous solutions.
This chemical is highly effective for pH adjustment, particularly in swimming pool maintenance and industrial metal finishing. Its anhydrous form allows for stable storage and precise dosing, making it a staple in the formulation of retail cleaning products and toilet bowl cleaners.
The product is valued for its low toxicity compared to sulphuric acid, while still delivering the necessary protons for effective scale removal and surface etching. Its ability to lower pH levels without adding chlorides makes it preferable for sensitive Concrete and Construction applications.
Typical Properties
| Molecular formula | H2O4S.Na |
|---|---|
| Molecular weight | 120.06 g/mol |
| Appearance | off-white granules, crystals or powder |
| Form | Granules |
| Color | White to light yellow |
| Melting point | 58 °C |
| Density | 2.1 |
| GHS signal word | Danger · Corrosive, Irritant / harmful |
| HS code | 28331900 |
| 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 Hydrogen Sulphate
Applications
- Water Treatment: Widely used as a pH-down agent in pools, spas, and industrial wastewater systems to balance alkalinity.
- Metal Finishing: Functions as a component in pickling baths and cleaning solutions to remove oxides and prepare surfaces for coating.
- Industrial Cleaning: Acts as a primary active ingredient in descaling agents and hard surface cleaners for the removal of mineral deposits.
Safety & Risks
Classified as Hazard Class 8 (Corrosive). Causes serious eye damage; wear Chemical Resistant Gloves and Eye Protection. In case of contact, rinse immediately with water.
Packaging
25 kg Woven Bags, 500 kg/1000 kg Big Bags, and 1 kg Retail Plastic Jars.