Check the listing for details. 1 oz MICROLUBROL Hexagonal Boron Nitride hBN Lubricant Powder FINE 2.5 µ Micron. Condition: New. Listed at 18.95 USD. MicroLubrol Hexagonal Boron Nitride (hBN, hex boron nitride, "white graphite"), 2.5 micrometers (microns, µm, micrometers), approximately 5000 mesh equivalent ("mesh" is a measure of the fineness of a material separation screen, but due to the impossibility of weaving such fine wires or filaments to produce such a fine screen there are no actual screens with mesh finer than 600 available, so the number is for relative particle size comparison only). FEATURES:Excellent lubricity: Coefficient of Friction (COF) as low as 0.15Appearance: Ultra-white, crystalline, free-flowing powderHigh purity: 99%High temperature resistance: Temperature stability in air is 1800ºF (1000ºC)NOTE: The Hexagonal Boron Nitride (hBN) product offered here is NOT cosmetic grade and has not been tested for use in cosmetics or any other regulated use.