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When Gene Roddenberry wrote "Star Trek" in a corner of the United States, a group of engineers are studying a less dangerous project, but this project has developed breakthrough and continues to affect the terminology of the PCB industry today.

FR4 sheet is a glass fiber epoxy resin coating plate, a substrate in a circuit board, which can be divided into general FR4 plates and high Tg FR4 sheets, and Tg is a glass conversion temperature, i.e., melting point. The circuit board must be flame-resistant and cannot be burned at a certain temperature, only can be soften. At this time, the temperature point is called the glass transformation temperature (TG point), which is related to the size stability of the PCB board.

Epoxy resin is a gligenic compound containing two or more epoxy groups in a general mean, and the most widely used epoxy resin variety in the world is bisphenol A epoxy resin, accounting for 80% of total consumption.

There are lots of solid insulation materials such as FR4 sheet, 3240 Epoxy Resin Sheet, and 3026 Phenolic Cotton Cloth Laminate Sheet.

In the middle of the 18th century, people could already process natural resins such as asphalt and rosin into man-made plastics. In the following just over a hundred years, plastics moved from the initial natural polymer processing stage to the synthetic material stage, solving the fatal problem of scarcity of raw materials. Then it flourished in the 1970s and became an indispensable existence in modern industrial production and life. At present, modified plastics have replaced traditional plastics and have become the most widely used materials such as FR4 sheet, 3240 Epoxy Resin Sheet and 3026 Phenolic Cotton Cloth Laminated Sheet, while also reflecting the cutting-edge technological level of modern materials science.

FR-4 sheet, one of the commonly used substrates, is a code number of a flame-resistant material, which means a material specification that the resin material must be able to extinguish themselves. FR-4 is not a material name, but a material level.

The general PCB finished plate thickness is 0.8mm to 1.6.mm between 1.6.mm, and the more common plate thickness specification is designed according to the 1.6 mm of the metric unit (about 63mil), many plugins The standard is also adapted in accordance with 1.6mm, what is the 1.6mm thickness standard?

1. Core assignment group The first step is that the unit selection group of the battery should be set to the parameter of the group: (cylindrical battery and lithium iron phosphate

Glass fiber (referred to as glass fiber) is a new type of inorganic non-metallic material with a superior performance. It is a wide range of composites in modern industries. It is also a new material that my country's key encouragement.