Zinc sulfide is an inorganic compound that typically appears as a white or slightly yellow powder and gradually oxidizes to zinc sulfate in humid environments. It has a slight irritant effect and can irritate the skin.
Hafnium-nitride, a grayish powder with cubic crystal structures, is available in a variety of sizes. The melting point is 3310. Microhardness is 16GPa. It's fairly stable but easy to corrode by concentrated sulfuric and hydrofluoric acids. Purity: 99
Boron powder, especially non-food grade boron powder, does pose certain health risks if ingested into the human body. Boron is a naturally occurring element widely distributed in the Earth's crust, water bodies and the atmosphere. Still, high levels of exposure to boron may have adverse effects on the human body.
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