Laminae split from mica blocks and mica thins where the combined thickness of ten sheets taken together does not exceed 0.30 mm (0.012 inch or 12 mils) are classified as Mica Splittings. Splitting Mica is chiefly used in the manufacture of micanite or built-up mica products for ultimate use as an insulating material. It is available in “Loose Form” and “Book Form” types.