Specification :

2. Base
FR-4 copper clad laminated sheet to be consisted of E-glass fabric, impregnated with epoxy resin and clad with electrolytic foil.
It has excellent electric, mechanical and flamer retardant properties and is widely used for PCB with printed circuit on one or both side in microwave ovens, computer, communication apparatus as well as high grade electronic instruments.

3 Appearance requirements
(1) The end face of foil covered board should be tidy without any delamination and crackle;
(2) Any bubble, wrinkle, pin hole, deep nick, pitting and glue spot on the copper foil covered face is not allowed. Any color changing or dirty can be easily removed by density 1.02g/cm3 hydrochloric acid or proper organic solution;
(3) On lamination face, the defects such as bubble, impressed pitting, nick and glue lack and outer impure which retard its use are not allowed.

4 Features
(1) Excellent dimensional stability;
(2) Excellent mechanical processability;
(3) Excellent heat resistance and mechanical properties;
(4) IPC-4101B/21 specification is applicable.

4 Application
Computer, communication, equipment, instrumentation, VCR, television, electronic game machine, and etc.