This is the inner plate for samsung cellphone.It is white FR-4 insulation board . 

It is used in damp environment condition and the transformer oil, it can be affected by acid and alkali, high hardness, high insulation, high temperature resistance. 

Fiber glass's advantages in the field of leather: good mechanical performance and good heat resistance and good flatness, smooth surface, no pits, thickness tolerance standard, compared with the ordinary board, PC board, fiberboard is not easily out of shape , it has good hardness and toughness, better support and reinforcing effect for electronic products, thinner and lighter, material is halogen sheet, more pro-environment.With apple Smartcover widely used in the field of application in leather,samsung Galaxy series also uses FR - 4 insulation as smart Cover's support plate. 

We can according to the requirements of customers, production samples and provide drawings to proceed.