The role of mica sheets

Mica flakes are an electrical insulating material composed of muscovite, quartz, garnet and rutile. Its color is semi-metallic and metallic. Mica sheets are widely used in daily life. At the same time, there are many classifications of mica sheets. Different types of mica sheets have certain differences in their functions, effectiveness and other aspects. So what are the functions of common mica sheets?

Mica sheets may contain albite, zoisite and chlorite, garnet is rich in Fe and Mg, and the Si content in polysilicate muscovite can reach 3.369, which is also a high-pressure combination. It has insulation and low-loss thermal resistance functions, and is also a very good black body.

use

Mica and its products are widely used as insulating materials in electrical products. Its varieties include: natural mica, synthetic mica, mica tape, mica board, mica foil, mica glass and so on.

Classification

There are many types of natural mica, which are used as electrical insulation materials.

There are two types of mica: muscovite and phlogopite. Muscovite has a glassy luster and is generally colorless and transparent; phlogopite has a metallic and semi-metallic luster, and common colors are golden yellow, brown, light green, etc., with poor transparency. Muscovite and phlogopite have good electrical and mechanical properties, good heat resistance, chemical stability and corona resistance. Both types of micas can be exfoliated into soft, flexible sheets with a thickness of 0.01 to 0.03 mm. The electrical properties of muscovite are better than those of phlogopite, but phlogopite is softer and has better heat resistance than muscovite.

According to the use, mica can generally be divided into three categories: mica flakes (thin mica), mica for capacitors and mica thick flakes for electron tubes. The area and thickness specifications of these three types of mica are shown in the following table as well as their grades and uses.

Area Specifications

Specification No. Area (square centimeters)

#3 65 and above

#4 50-65

#4.5 40-50

#5 30-40

#5.5 20-30

#6 15-20

#6.5 10-15

#7 6-10

#8 4-6

Note: Area refers to the largest rectangular area on the mica sheet