Inorganic Acids & Bases
REACH
Ammonium hydroxide
CAS Number
1336-21-6
EC Number
215-647-6
E Number
E527
What is Ammonium hydroxide?
Ammonium hydroxide (CAS 1336-21-6), also sold as ammonia water and designated E527 in food-grade applications, is an aqueous solution of ammonia used industrially as an alkaline reagent and pH control agent.
Where is Ammonium hydroxide used?
- Water treatment: pH adjustment and chloramine disinfection in municipal systems
- Textile, leather and paper processing: neutralising acids, swelling fibers, conditioning pulp
- Industrial and household cleaning: cutting grease and protein-based soils
- Rubber compounding: stabiliser for latex dispersions, preventing premature coagulation
- It functions where a fast-acting, readily soluble base is required.
Commercial specifications
- Aqueous solution, concentration typically 25% to 30% ammonia by weight for industrial supply
- Food-grade material conforming to E527 specifications
Other Names (Synonyms)
Ammonia water|Ammonia aqueous|Ammonia, aqua|Household ammonia|Ammonia, monohydrate|Ammonium hydroxide ((NH4)(OH))|Aqua ammonia|E527
What are the physical properties of Ammonium hydroxide?
Melting Point -77°C
Boiling Point 38 °C
Density ~0.90 g/cm³ (approx) @ Temp: 25 °C
Appearance Ammonium Hydroxide is a colorless to milkywhite solution of ammonia, with a strong, irritating odor.
Color Colorless
Odor Strong pungent ammonia odor detectable at 17 ppm
Form Liquid, Single Sub-Boiling Quartz Distillation
Water Solubility Miscible with water.
Vapor Pressure 115 mmHg at 20 °C for 29% solution
pH 10.09(1 mM solution);10.61(10 mM solution);11.12(100 mM solution);
How is Ammonium hydroxide classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS09· Environmental Hazard GHS07· Irritant GHS08· Health Hazard GHS06· Toxic
Hazard Statements
H290 May be corrosive to metals
H302 Harmful if swallowed
H314 Causes severe skin burns and eye damage
H318 Causes serious eye damage
Precautionary Statements
P234 Keep only in original packaging.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to Ammonium hydroxide?
HS Code 28142000
UN Number 2672
ADR Class 8
Packing Group III
WGK (Germany) 2