Introduction to Zinc Sulfide
Zinc sulfide has a refractive index of 2.37, a density of 4.0g/cm3, and an oil absorption capacity of 13g/100g. Its coverage and acid resistance are worse than 319 titanium dioxide. But ZnS does not absorb in the wavelength range of 450-500nm (blue), so it does not exhibit a yellow background like titanium dioxide, making it very suitable for coatings with high whiteness requirements. ZnS's light resistance is better than titanium dioxide's, and the coating of the former is softer than that of the latter, resulting in better wear resistance. In addition, ZnS has a higher degree of UV reflection than titanium dioxide and has much better-yellowing resistance at room temperature (especially in acrylic and silicone resins). It also provides stable absorption of infrared radiation emitted by the sun, making it very suitable for topcoats used in aircraft and spacecraft. Formula: ZnS Molecular Weight: 97.43. CAS No.：1314-98-3。 White or slightly yellow powder. When burned in H2S gas, it transforms into crystals. α The variant is a colorless hexagonal crystal with a density of 3.98g/cm3 and a melting point of 1700 ± 28 ℃ (202.66 kPa -20 atmospheric pressure); β The variant is a colorless cubic crystal with a density of 4.102g/cm3, which is transformed into α Type. It exists in sphalerite. Insoluble in water and easily soluble in acids. The color darkens when the sun shines—transformed into zinc sulfate after prolonged exposure to humid air. The interaction of hydrogen sulfide and zinc salt solution generally obtains it. If trace amounts of Cu, Mn, and Ag are added as activators to the crystal ZnS, it can emit fluorescence of different colors after illumination. Used as analytical reagents, coatings, paints, white and opaque glass, filled with rubber and plastics, and for preparing fluorescent powders. Produced by co-heating sulfur with zinc. Relative density 4.087. Melting point 1700 ℃. Thermal conductivity 25.1w/(m · K), coefficient of thermal expansion (volume): 100 ℃, 0.163; 200℃，0.395； 400℃，0.919； 800℃，2.146。 Β Zinc sulfide is a cubic crystal. White to grayish white or yellow powder. Relative density 4.102, melting point l700 ℃. Coefficient of thermal expansion (volume): 100 ℃, 0.156; 200℃，0.386； 400℃，0.898； 800℃，1.996。 It can slowly oxidize into sulfates in the air. The crystal transformation temperature is 1020 ℃. If you are looking for high quality, high purity and cost-effective zinc sulfide, or if you require the latest price of zinc sulfide, please feel free to email contact mis-asia.