Its a 99% Pure mica powder. - Average particle size of this Produce code U 80 is 10-70 Micron. We produce mica powder from 100 Micron. Usually market requirement are supplied. - The test standard mentioned SO-IN-MUL-TE109 is a method for the determination of trace elements using Inductively Coupled Plasma â?? Mass Spectrometry (ICP-MS). It is done by independent Lab - SGS INDIA Laboratory for our mica powders at various intervals. For your information, We have our inhouse Lazer analyser machine, Digital Microscope, Muffle furnace and other equipment for quality control of our products produced.