A. Urea paperboard

The characteristic is: the color is light yellow, commonly used for single panel, but due to being made of urea paper, it is easy to rot in cool and humid places, so it is no longer commonly used

B. CAM-3 board

The characteristics are: milky white color, good toughness, high CTI (600V), and only a quarter of the normal carbon dioxide emissions. It is now more commonly used in single panels

C. FR4 fiberboard

The characteristics are: made of fibers, with good toughness, and threads pulling each other when broken. It is commonly used in multiple panels, with a thermal expansion coefficient of 13 (16ppm/c). The mother board used in our factory is made from this board

D. Multi-layer board

Features: high Tg, high heat resistance and low thermal expansion rate, low dielectric constant and dielectric loss material, commonly used for four or more layers

E. Soft board

Features: Soft and transparent material, commonly used at the electrical connection between two boards for easy folding, such as the connection between the LCD and the computer body in a laptop