... WS2 is a compound of tungsten and sulfide, black powder, insoluble in water and organic solvents, reacting with ... It can be used at high temperature, high pressure, high vacuum, high load, high rotating speed, ultra-low temperature, high radiation and corrosion conditions. ... and stable catalytic activity. Technical guideline of high purity fine tungsten disulfide powder: WS299.85-99.95% W≈74.12 ...