Home › Chemicals › Sodium Hydroxide CAS 1310-73-2: Sodium Hydroxide (NaOH) Identity CAS Number 1310-73-2 Molecular Formula NaOH IUPAC Name sodium hydroxide Molecular Weight 40.0 g/mol SMILES [Na+].[OH-]Synonyms caustic soda, lye, sodium hydrate, NaOH
2D Structure
Physical Properties Density 2.13 g/mL at 25°C Boiling Point 1388.0°C Melting Point 323.0°C Flash Point None°C Vapor Pressure 0.0 kPa at 20°C Refractive Index nD = 1.41 Dielectric Constant ε = 250.0
Safety & GHS Classification GHS05
H314: Causes severe skin burns and eye damage H290: May be corrosive to metals Storage: Store in airtight containers — highly hygroscopic. Dissolution in water is extremely exothermic — add slowly. Never add water to solid NaOH. Keep away from acids, metals, and organic materials. PPE: chemical goggles, gloves, face shield.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Good PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Good NBR Fair EPDM Good Silicone Good FKM Good
Metals Material Rating Stainless 316 Good Aluminum Poor Copper Poor Brass Poor
Applications Pulp and paper manufacturing (Kraft process) Soap and detergent production Petroleum refining Textile processing (cotton mercerization) Drain cleaner Alumina production (Bayer process) Chemical intermediate Water treatment pH adjustment External References: PubChem
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