CAS 5329-14-6 · Solid Inorganic Acid
Sulfamic Acid
Amidosulfuric Acid · H₃NSO₃ · MW 97.09 g/mol
Sulfamic acid is a dry, non-fuming, non-volatile solid acid with strong descaling and cleaning power. Its white crystalline form makes it safer and easier to handle than liquid mineral acids, while still delivering effective dissolution of calcium carbonate, rust, and mineral scale. Texas-Chem supplies sulfamic acid in industrial, technical, ACS, and food-grade qualities in bags and drums.
Formula
H₃NSO₃
Melting Point
205 °C (decomposes)
Solubility
~214 g/L at 20 °C
Pack Sizes
Bags · Drums · Super Sacks
Structural Formula
Sulfur center bonded to an amino group (–NH₂), a hydroxyl (–OH), and two double-bonded oxygens
Safety & Regulatory
- NFPA Health
- 2 — Moderate hazard
- NFPA Flammability
- 0 — Non-flammable
- NFPA Reactivity
- 0 — Stable
- OSHA PEL (TWA)
- Not established
- ACGIH TLV (TWA)
- Not established
- DOT Hazard Class
- 8 — Corrosive
- UN Number
- UN 2967
- Packing Group
- III
- HMIS Health
- 2 — Moderate
Corrosive — use appropriate PPE when handling. Always consult the current Safety Data Sheet before handling.
Grades & Packaging
Available Grades
Pack Sizes
Physical & Chemical Properties
| Molecular Formula | H₃NSO₃ |
| Molecular Weight | 97.09 g/mol |
| CAS Number | 5329-14-6 |
| Appearance | White crystalline solid |
| Melting Point | 205 °C (401 °F) — decomposes |
| Boiling Point | Decomposes before boiling |
| Density | 2.126 g/cm³ at 20 °C |
| Solubility in Water | ~214 g/L at 20 °C |
| pH (1% solution) | ~1.2 |
| Vapor Pressure | Negligible at 20 °C |
| Flash Point | Non-flammable solid |
| pKa | 1.0 (strong acid behavior) |
Industrial Applications
Descaling & Cleaning
The preferred acid for descaling boilers, heat exchangers, condensers, cooling towers, and process equipment. Sulfamic acid dissolves calcium carbonate, rust, and mineral scale without fuming or attacking most metals at use concentrations.
Metal Finishing & Electroplating
Used in nickel, copper, and tin electroplating baths as a pH buffer and brightener. Provides stable, low-stress deposits and is compatible with most plating chemistries.
Pulp & Paper
Chlorine stabilizer in bleaching operations — reacts with excess chlorine to form chlorosulfamic acid, preventing chlorine loss and improving bleach efficiency in kraft and sulfite pulping.
Herbicide & Agriculture
Active ingredient in ammonium sulfamate-based herbicides for brush and weed control. Also used as a flame retardant for cellulosic materials in agricultural and forestry applications.
Dye & Textile Industry
Diazotization reagent for azo dye synthesis. Destroys excess nitrous acid after diazotization reactions, preventing side reactions and improving dye yield and purity.
Swimming Pool & Water Treatment
Solid acid for pH reduction in swimming pools, spas, and industrial water systems. Safer to handle than liquid acids, with no fuming and easy dosing by weight.
Why Source Sulfamic Acid from Texas-Chem?
- 35+ years supplying industrial acids to Texas manufacturers and processors
- Industrial, technical, ACS reagent, and food-grade (FCC) available
- Flexible packaging from 50-lb bags to super sacks
- Competitive pricing backed by top-tier producer relationships
- Technical support and SDS documentation with every order
- Same-day quotes for standard quantities
Sulfamic Acid vs. Alternatives
Sulfamic acid is a dry, stable solid acid ideal for descaling, cleaning, and metal treatment where liquid mineral acids are impractical. Here's how it compares.
| Attribute | Sulfamic Acid | Hydrochloric Acid | Citric Acid |
|---|---|---|---|
| Physical State | White crystalline solid — easy to handle | Fuming liquid — fume hazard | White crystalline solid |
| Chloride Content | Zero — no chloride corrosion risk | High — stress corrosion risk on SS | Zero |
| Descaling Effectiveness | Excellent — dissolves CaCO3, Fe oxides | Excellent — but fume and corrosion risk | Good — gentler, chelating action |
| pKa | 1.0 (strong acid) | −7 (very strong) | 3.13 (first) |
| Storage & Handling | Dry solid — stable, no fumes at ambient | Liquid — fumes, corrosive vapors | Dry solid — stable |
Industries We Supply Sulfamic Acid To
Industrial Descaling & Cleaning
Sulfamic acid is the preferred descaler for boilers, heat exchangers, cooling towers, and process equipment — effective on calcium carbonate and iron oxide scale.
Sulfamic Acid supply in Houston, TXFood Processing Equipment
Used for CIP (clean-in-place) descaling of dairy equipment, beverage lines, and food processing machinery where chloride-free cleaning is required.
Sulfamic Acid supply in Dallas, TXMetal Finishing & Electroplating
Sulfamic acid baths used for nickel electroplating, tin plating, and metal surface preparation — provides bright, low-stress deposits.
Sulfamic Acid supply in Beaumont, TXPulp & Paper
Used for chlorine dioxide stabilization and as a bleaching chemical in pulp and paper manufacturing operations.
Sulfamic Acid supply in Lufkin, TX