Substance profile
Sulfamic Acid
Sulfamic Acid is orthorhombic crystals and is odorless.
01 · Identification
What Sulfamic Acid is
Sulfamic Acid is orthorhombic crystals and is odorless. Its molecular formula is H3NO3S and its molecular weight is 97.1 g/mol. It melts at 205 °C.
Under the GHS it carries the signal word Warning. It is classed as corrosives.
Other names for Sulfamic Acid
- sulphamidic acid
- sulphamic acid
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
| H412 | Harmful to aquatic life with long lasting effects. |
Precautionary statements: P264, P273, P280, P302, P305, P313, P332, P337, P338, P352, P501
03 · Physical and chemical properties
Sulfamic Acid properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | DECOMP @ BOILING POINT | HSDB | |
| Melting point | 205 °C (401 °F) | HSDB | |
| Density | 2.15 g/cm³ | HSDB | |
| 2.1 g/cm³ | ICSC | ||
| 2.15 g/cm³ | at 25 °C | DOE PAC | |
| Solubility | SPARINGLY SOL IN ALC, METHANOL; SLIGHTLY SOL IN ACETONE; INSOL IN ETHER; FREELY SOL IN NITROGENOUS BASES AND IN NITROGEN CONTAINING ORG SOLVENTS | HSDB | |
| INSOL IN CARBON DISULFIDE & CARBON TETRACHLORIDE | HSDB | ||
| Solubility in water at 20 °C: freely soluble | at 20 °C | ICSC | |
| Lower explosive limit (LEL) | Flammability Limits = 9.3 vol% | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Source notes
Further notes on Sulfamic Acid
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Corrosivity
H2SO4 (3wt%) and HCl (3wt%) are 2.6 and 4.2 times more corrosive, respectively, than a 3 wt% solution of sulfamic acid on 1010 steel. On the same scale, H2SO4 and HCl (3wt% solutions) are 1.5 and 6.7, respectively, times more corrosive on copper; 1.5 and 2.8 more corrosive on brass; 4.0 and 7.0 more corrosive on bronze; 0.6 and 5.3 more corrosive on aluminum.
Source: HSDB
05 · Handling and storage
Storing and handling Sulfamic Acid
Incompatible materials
Chlorination of amidosulfuric acid or acidic ammonium chloride solutions gives the powerfully explosive oil nitrogen trichloride.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
SULFAMIC ACID reacts exothermically with bases. Aqueous solutions are acidic and corrosive.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Sulfamic Acid in the storage compatibility matrix →