Polycrstalline - This black powder is produced through a shock synthesis process which uses controlled explosions. EID Polycrystalline Micron Diamonds feature a unique polycrystalline structure that facilitates controlled microfracturing. This super abrasive resists major cleavage fractures and its high toughness allows it to tolerate three times higher operating pressures than monocrystalline diamond.

 It is recommended for lapping and finishing sapphire, ruby, ferrite's, ceramics and other non-metal oxides.