The synthetic mica is a mica crystal made of natural , minerals and other chemical materials by accurate

metrology, uniform burden, smelting in electric furnace and cooling crystallization. There are more than ten

kinds of synthetic mica, but the most successful one is fluoromica being suitable for industrial production.

The synthetic mica is white, transparent, very pure, having higher electric insulation, heat resistance and very

stable chemical properties so that it is widely using for many kinds of high heat-resistant products.

The property comparison between synthetic and natural mica is as follows.

Mica	Heat Resistance℃	Volume densityG/cm3	Tensile strengthMpa	Dielectric StrengthKV/mm	SurfaceResistanceΩ	Dielectric constante	Whitness
Synth.Mica	1100-1200	2.78-2.85	150	185-238	3×1013	5.8-6.3	90
Natur.mica	600-700	2.69-2.78	110-140	115-140	3×1011	5.0-6.0	60

Due to the military requirement, in period of 2nd international war, Germany and Japan have made many studies

and tests on synthetic mica. In that time, Simenz company of Germany have got 400 cm2 monocrystal mica sheets,

but after wards they have not any success. Their military study department invented " Inner Electric Resistance

Melting Technology" (i.e. inner burning technology) accelerating the industrial production possibility of

synthetic mica.

Since 60's of 20th century, China began to study inner burning synthetic mica. At present, the industrial

production level of synthetic mica is in the head in the word. For example, Hunan Pingjiang Yunk Synthetic

Crystal New Material Co. Ltd have made mica with a max crystal dimension more than 500 cm2. This mica crystal

can be used to manufacture the uncalcined mica paper MPM3-S(504), MPM3-6(505), MPM3-H(506) and MPM3-

H(507,508)etc. And their tech properties can reach the requirements specified in GB 10216. Their index of

permeability, ventilaty and electric conductivity etc are all higher than international levels. The papermaking

with

fluoromica can not only supply a new material for electric insulated product industry, but also open a new

material source for the papermaking industry with mica.

Owing to the synthetic mica having an excellent whitness, free-foreign matters, excellent permeability,

diathermancy, electrical heat-resistant properties, so the synthetic mica tapes are very ideal electric

insulation ,materials. Someone said that the synthetic mica tapes having F and it is not suitable for making

zero halogen cables. This wording is very wrong.

At first, The F exists in the form of ions in synthetic mica. The F ions have a strong electric negativity and

have a strong attraction to other ions, so that the synthetic mica have very stable structure , can't decompose

at high temperature. Its chemical stability and heat-resistance are better than natural mica. On the theoretical

view, the element F in synthetic mica is only 6-8%. But in Guangzhou Yingke Synthetic Crystal New Material Co.

Ltd , the F is only 6.8%.

Secondly, the synthetic mica is made by melting composition of even compound of fluoropotossiun,

fluoroaluminate, aluminun oxide, feldspar, quartz sand, magnesium oxide etc at high temperature (1300℃). The

result of combination reaction in forming a no-compositive potassium, aluminun and magnesium fluoroaluminate.

The F ions and other ions combinated into a compound (siF4), so there does not existing the toxic free fluorine.

Thirdly, our company have sold more than 100 tons of synthetic mica tapes. The practice aprove there is not any

toxic arm. The synthetic mica products are widely used in electric industry.

The synthetic mica and its product---synthetic mica tapes is a quite new heat-resistant, fire-resistant electric

insulation material, and attract attention of cable industry of the world.