The glass components used in electronic-grade glass fiber cloth are all aluminocarbon silicates, commonly known as alkali-free glass, and internationally referred to as E glass, that is, electrical insulating glass.
Inactive glass refers to aluminum silicate glass with an alkali metal oxide content of less than 1%. This kind of glass was originally developed for electrical applications, but the scope of application has gone far beyond this scope, and it has almost become a universal glass formulation, and its application quantity has accounted for 80% of the total production of continuous glass fibers in the world. -90%.
At present, the glass components of E glass fibers produced in various countries in the world are roughly the same. The fluctuation range is roughly as follows: Si02 53%-56%; A20, 14%-18%; Ca0 20%-24%; Na20 + K0 0.5%~1.0%; B0, 5%-10
Electronic fiberglass muslin
The electrical insulation performance of the electronic glass fiber cloth is very high. Its volume resistivity and surface resistivity are both greater than 10"0.cm at room temperature, and the dielectric loss angle 4 at a frequency of 10°H is 1.1x10-. The dielectric constant e is 6.6, and the alkali-free glass fiber has high strength. Its new ecological unit strength is as high as 3.5GPa. The elastic modulus is 730CPa. It is worth mentioning that the metal oxide in the glass composition is Na, 0+ The content of K20 is the main factor affecting the electrical insulation performance of glass fiber. In order to improve the electrical insulation performance of glass fiber, the content of alkali metal oxides in the glass composition must be strictly controlled.
Technical tests have proved that the Nap0 +K, 0 content in the glass fiber is reduced from 1.6% to 0.5%. Then the volume resistance of the glass fiber can be increased by 10 orders of magnitude. Therefore, in order to ensure the electrical insulation performance of alkali-free glass fiber as an electrical insulating material, all countries in the world stipulate that the Nao + K0 content of E glass fiber should be less than 1%, generally controlled at 0.8%