TG in PCB circuit board material means temperature resistance.
The higher the Tg point is, the higher the temperature will be required when suppressing the plate. What is suppressed will become hard and brittle, which will affect the quality of mechanical drilling to some extent in the immediate process.
Ordinary Tg sheet is above 130 degrees, High-Tg is generally above 170 degrees, and medium Tg is above 150 degrees. The Tg of the substrate has been improved, covering heat resistance, moisture resistance, chemical resistance, stability, etc., and the function of the printed board will continue to improve.
The higher the TG value, the better the heat resistance of PCB board, especially in the lead-free tin spray process, high Tg is more widely used.
The higher the TG value, the better the heat resistance of sheet metal, especially in lead-free process, high TG is used more.
The glass transition temperature is one of the characteristic characteristic temperatures of polymer. With the glass transition temperature as the boundary, the polymer expresses different physical properties: below the glass transition temperature, the polymer material is a molecular compound plastic; Above the glass transition temperature, the polymer material is rubber.
From the point of view of engineering application, glass transition temperature is the maximum temperature of engineering molecular compound plastics, is the lower limit of rubber or elastomer application.
With the rapid progress of the electronic industry, especially the progress of electronic products represented by computers, high function and high multilayer progress requires printed circuit board base material to have higher heat resistance, which is the guarantee of closing.
SMT and CMT as the representative of the high density of the installation technology emerged and progress, in order to PCB aperture, precision wiring and thin shape and the substrate of high heat resistance support more and more dense can not be separated.
Temperature resistance 2113 value.
The Tg point indicates that the higher the temperature requirement of sheet metal at the time of pressing 5261, the spanner ratio and brittness of 1653 produced by pressing 4102, which will affect the quality of mechanical drilling (if any) after the process and the special properties of electrical properties during application to some extent.
The board material of ordinary Tg is more than 130 degrees, the High Tg is more than 170 degrees, and the medium Tg is more than 150 degrees. The Tg of the substrate increases, and the characteristics and marks of heat resistance, moisture resistance, chemical resistance, and fastness resistance of the printed board will increase and improve.
The higher the TG value, the better the temperature resistance of sheet metal, especially in the process of lead-free tin-spraying, high Tg is often used.
Come in handy
With the leap forward of the electronic industry, especially the electronic products represented by computers, towards high functional, high multilayer progress, the need for PCB substrate material higher heat resistance as a guarantee of closing. The appearance and progress of high density installation technology represented by SMT and CMT make PCB more and more inseparable from the support of high heat resistance of substrate in the aspect of hole diameter, precision and fine line and thin shape.
So the difference between ordinary FR-4 and high Tg FR-4 is that in the hot state, especially in the heat after moisture absorption, the mechanical strength of the material, dimensional stability, bonding, water absorption, thermal decomposition, heating expansion and other things are different. The surface of high Tg products is better than the ordinary PCB base material. In recent years, The number of customers requiring high Tg circuit boards is increasing year by year.
1. The velocity of the substrate by solid melting rubber liquid is called the Tg point or melting point
2. The higher the Tg point is, the higher the time requirement of the plate pressing will be. The pressed wrench will also be hard and brittle, which will affect the quality of the mechanical drilling (if any) in the post-process and the special properties of the electrical properties in the application to a certain extent.
3.Tg point is the maximum temperature (℃) at which the substrate maintains rigidity. That is to say, the ordinary PCB substrate material at high temperature, not only initiation softening, deformation, melting and other phenomena, but also the rapid decline of mechanical and electrical special properties
4. The plate material of ordinary Tg is more than 130 degrees, that of High-Tg is more than 170 degrees, and that of medium-normal Tg is more than 150 degrees. With the increase of Tg of the substrate, the characteristics and marks of heat resistance, moisture resistance, chemical resistance and fastness of the printed board will increase and improve. The higher the TG value, the better the temperature resistance of sheet metal, especially in the process of lead-free tin-spraying, high Tg is often used.
Tg refers to the transformation temperature of CORE glass, which you know as the softening temperature of sheet metal. tg value is usually the critical melting point value of high-rise board, and the temperature resistance value can be commonly understood. For the person assuming the position, the Tg value of the PCB selected depends on the office temperature or background conditions of the PCB of the product involved. Like common sense fr-4 board TG value in the range of 130-150, that is appropriate and the use of fr-4 substrate is the acquisition of health benefit tg140 and Jian Tao tg130 these two A class military materials, this tg value board in consumer electronics, transportation electronics, industrial control, spectrograph instrumentation, power and other fields are more widely used.