The circuit board must be flame-resistant. It cannot be burnt at a certain temperature but can only be softened. The temperature point at this time is called the glass transition temperature (Tg point), and this value is related to the dimensional stability of the PCB board.

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Tg refers to the glass transition temperature of the sheet. Normal sheet (Normal Tg) is about 130~150C, and Tg of high Tg sheet can reach 170-210C.

FR4 copper clad laminate is the abbreviation of glass fiber epoxy resin clad laminate. FR4 copper clad laminate is divided into the following levels:

First: FR-4 A1 grade copper clad laminate

This level is mainly used in military products, communications, computers, digital circuits, industrial instruments, automotive circuits and other electronic products. The quality of this series of products has completely reached the world-class level, the highest grade and the best performance.

Second: FR-4 A2 grade copper clad laminate

This level is mainly used for ordinary computers, instruments, advanced home appliances and general electronic products. This series of copper clad laminates are widely used, and various performance indicators can meet the needs of general industrial electronic products. There is a good price-performance ratio. Can enable customers to effectively improve price competitiveness.

Third: FR-4 A3 grade copper clad laminate

This level of CCL is the FR-4 product developed and produced by our company specifically for the home appliance industry, computer peripheral products and general electronic products (such as toys, calculators, game consoles, etc.). The characteristic is that the price has a competitive advantage under the premise that the performance meets the requirements.

Fourth: FR-4 A4 grade copper clad laminate

This grade of plate belongs to the low-end material of FR-4 copper clad laminate. However, various performance indicators can still meet the needs of ordinary home appliances, computers and general electronic products. Their prices are the most competitive, and the performance-price ratio is also very good.

Fifth: FR-4 Class B copper clad laminate

The plates of this grade are relatively poor, and the quality stability is poor. It is not suitable for circuit board products with a large area. Generally, products with a size of 100mmX200mm are suitable.