Home › Chemicals › Ammonium Hydroxide CAS 1336-21-6: Ammonium Hydroxide (NH4OH) Identity CAS Number 1336-21-6 Molecular Formula NH4OH IUPAC Name ammonium hydroxide Molecular Weight 35.05 g/mol SMILES NSynonyms ammonia solution, ammonia water, aqueous ammonia, ammonium hydrate
2D Structure
Physical Properties Density 0.9 g/mL at 25°C Boiling Point 38.0°C Melting Point -57.0°C Flash Point None°C Vapor Pressure 48.0 kPa at 20°C Refractive Index nD = 1.335 Dielectric Constant ε = 80.0
Safety & GHS Classification GHS05 Irritant GHS09
H314: Causes severe skin burns and eye damage H335: May cause respiratory irritation H400: Very toxic to aquatic life Storage: Store in ventilated, corrosion-resistant cabinet. Ammonia vapors are corrosive to copper, brass, and galvanized surfaces. Keep container tightly sealed — ammonia vapors escape easily. Store away from acids and strong oxidizers. Use in fume hood with acid-resistant PPE.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Excellent PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Good NBR Good EPDM Excellent Silicone Good FKM Good
Metals Material Rating Stainless 316 Excellent Aluminum Good Copper Severe Effect Brass Severe Effect
Applications Household and industrial cleaning agent pH adjuster and neutralizing agent Fertilizer manufacturing intermediate Water treatment pH control Textile processing (mercerization) Food additive (E527 — acidity regulator) Flue gas desulfurization Laboratory analytical reagent External References: PubChem
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