Home › Chemicals › Water (Deionized) CAS 7732-18-5: Water (Deionized) (H2O) Identity CAS Number 7732-18-5 Molecular Formula H2O IUPAC Name water Molecular Weight 18.02 g/mol SMILES OSynonyms DI water, deionized water, purified water, aqua
2D Structure
Physical Properties Density 1.0 g/mL at 25°C Boiling Point 100.0°C Melting Point 0.0°C Flash Point None°C Vapor Pressure 2.33 kPa at 20°C Refractive Index nD = 1.333 Dielectric Constant ε = 80.1
Safety & GHS Classification
Storage: Store in clean containers. Deionized water absorbs CO2 from air, becoming slightly acidic — use promptly for critical applications. Resistivity decreases over time. No hazard classification.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Excellent PE Excellent PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Excellent NBR Excellent EPDM Excellent Silicone Excellent FKM Excellent
Metals Material Rating Stainless 316 Excellent Aluminum Good Copper Good Brass Good
Applications Laboratory solvent and reagent Pharmaceutical manufacturing Semiconductor wafer cleaning Cooling system make-up water Battery electrolyte preparation Steam generation (power plants) Cosmetics manufacturing Chemical synthesis solvent External References: PubChem
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