Ratan Dielectrics

Guru Saday Road, Kolkata, West Bengal

offers knife dressed sheet mica of a minimum thickness of 0.18 mm (0.007 inch) which is classified as Block Mica. Block Mica is obtained in size as large as 30 to 35 square cm (12 to 14 square inches) beyond which is practically rare and far too expensive. It is available in sheets with an average thickness between 0.18 – 0.75 mm (0.007 – 0.030 inch). We offer block mica both in natural (random) and calibrated thickness as per customers’ requirement.From the beginning of the trade, Indian mica producers have been following IS 1175 system of size grading and classification of muscovite mica which is widely accepted in international trade of mica world over even today. As per IS 1175 specification the grading for all full trimmed muscovite mica is done based on the maximum usable rectangle area that may be cut from the specimen and not on the total area. The below table shows the grading for muscovite mica blocks, thins and films.

Mica scrap is the by-product of mining, trimming and fabricating sheet mica which is widely used for the manufacture of mica paper.Scrap mica obtained in course of cobbing, rifting and dressing crude mica as extracted from the mine by means of a sickle as well as recovered by means of hammer-crushing cross-grained mica which cannot be used as sheet mica for commercial purposes is classified as mine scrap. It is screened over 1.9 square cm (or 0.75 square inch) openings and have an average size between 25-50 mm (1-2 inches) and thickness ranging between 0.25 – 1.25 mm (0.010-0.060 inches).RD offers mine scrap that is clean, dry, hard, free from mineral and non-mineral impurities such as Quartz, feldspar, garnet, tourmaline, stones, mud-stained or biotite mica, clay, sane as well as other foreign inclusions viz: paper, wood leaves, straw, jute strings, nails or any other iron-contents etc.