I. Introduction 1. Mineral properties and uses Mica is a layered silicate mineral. The mica minerals include muscovite, biotite and scale mica. Commonly used in industry white spoon is muscovite, followed by phlogopite. The properties of mica minerals are shown in Table 1, and the use is shown in Table 2. 2. Resources and production The distribution of mica resources in China is shown in Table 3, and the output is shown in Table 4. World mica production is shown in Table 5. 3. Product quality standards There are currently no national standards for Chinese mica products, only two standards: (1) Industrial raw material mica standard jc49-82 This standard is applicable to the processing of raw materials for electrical and telecommunication mica insulation materials. It is divided into five categories according to the largest effective area of ​​either side of the mica crystal. See Table 6. (2) Standard for mica film for electronic tubes jc52-82 This standard applies to high quality natural muscovite tablets. The diameter of the effective area is divided into ten specifications: ф15, 17, 19, 21, 25, 30, 35, 40, 45, 50 mm. The percentage of the effective area to the total area should be in accordance with Table 7. The thickness, tolerance and thickness difference between any two points in the effective area shall be in accordance with Table 8. Pet Mattress,Pet Dog Mattress,Pet Bed Mattress,Round Pet Bed Removable Dalian CS Logistics Technology Co., Ltd , https://www.dlcsems.com