A very effective physical sunscreen that blocks both UVA and UVB rays.
Zinc white, calamine, philosopher's wool, Chinese white, flowers of zinc
|Molar mass||81.38 g/mol|
|Melting point||1,975 °C (3,587 °F; 2,248 K) (decomposes)|
|Boiling point||1,975 °C (3,587 °F; 2,248 K) (decomposes)|
|Band gap||3.3 eV (direct)|
Refractive index (nD)
a = 3.25 Å, c = 5.2 Å
Std enthalpy of
|Safety data sheet||ICSC 0208|
EU classification (DSD)
|Dangerous for the environment (N)|
|Flash point||1,436 °C (2,617 °F; 1,709 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|240 mg/kg (intraperitoneal, rat)
7950 mg/kg (rat, oral)
LC50 (Median concentration)
|2500 mg/m3 (mouse)|
LCLo (Lowest published)
|2500 mg/m3 (guinea pig, 3–4 hr)|
|US health exposure limits (NIOSH):|
|TWA 5 mg/m3 (fume) TWA 15 mg/m3 (total dust) TWA 5 mg/m3 (resp dust)|
|Dust: TWA 5 mg/m3 C 15 mg/m3
Fume: TWA 5 mg/m3 ST 10 mg/m3
IDLH (Immediate danger)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Zinc oxide is an inorganic compound with the formula ZnO. ZnO is a white powder that is insoluble in water, and it is widely used as an additive in numerous materials and products including rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, and first-aid tapes. It occurs naturally as the mineral zincite, but most zinc oxide is produced synthetically.
ZnO is a wide-bandgap semiconductor of the II-VI semiconductor group. The native doping of the semiconductor due to oxygen vacancies or zinc interstitials is n-type. This semiconductor has several favorable properties, including good transparency, high electron mobility, wide bandgap, and strong room-temperature luminescence. Those properties are valuable in emerging applications for: transparent electrodes in liquid crystal displays, energy-saving or heat-protecting windows, and electronics as thin-film transistors and light-emitting diodes.