Muscovite mica crystals have alternating layers of aluminosilicate and potassium ions.The one-atom thick layersd of potassium ions are very easy to split apart into thinnest film,while aluminosilicate layers are tightly bonded together.As a result, extremely thin sheets of muscovite mica can easily separated,yet these thin sheets are flexible and though.Besides,muscovite mica have excellent dielectric,thermal,mechanical and chemical properties and can withstand rigorous shock and vibration testing.