Pure zinc oxide appears as a white, odorless powder free‑of mechanical impurities. It does not dissolve in water, yet is soluble in organic solvents including ethanol and ether. Being a typical amphoteric oxide, it reacts with dilute acids to generate zinc salts and also reacts with strong alkalis to yield zincates.
Zinc oxide Chemical Properties
| Melting point | 1975 °C |
| Boiling point | 1949.9°C (estimate) |
| Density | 5.6 |
| Bulk density | 200-700kg/m3 |
| Refractive index | 2.008~2.029 |
| Fp | 27℃ |
| Storage temp | Store at +5°C to +30°C. |
| Solubility | 0.0016g/l insoluble |
| Form | Nanopowder |
| Color | White to pale yellow |
| Specific Gravity | 5.61 |
| PH | 7 (50g/l, H2O, 20℃)(slurry) |
| Odor | Wh. to gray powd. or crystals, odorless, bitter taste |
| Water Solubility | 1.6 mg/L (29 ºC) |
| Crystal Structure | ZnO type |
| crystal system | Six sides |
| Merck | 14,10147 |
| Space group | P63mc |
| Lattice constant | A/nmb/nmc/nmα/oβ/oγ/oV/nm30.324950.324950.5206990901200.0476 |
| Dielectric constant | 40.0（20℃） |
| Exposure limits | ACGIH: TWA 2 mg/m3; STEL 10 mg/m3 OSHA: TWA 5 mg/m3; TWA 15 mg/m3 NIOSH: IDLH 500 mg/m3; TWA 5 mg/m3; STEL 10 mg/m3; Ceiling 15 mg/m3 |
| Stability | Stable. Incompatible with magnesium, strong acids. |
| InChIKey | XLOMVQKBTHCTTD-UHFFFAOYSA-N |
| CAS DataBase Reference | 1314-13-2(CAS DataBase Reference) |
| NIST Chemistry Reference | Zinc oxide(1314-13-2) |
| EPA Substance Registry System | Zinc oxide (1314-13-2) |
