Circuit board plate grade and grade introduction

　　According to the grade level from bottom to high divided as follows:

　　94HB/94VO/22F/CEM-1/CEM-3/FR-4

　　The details are as follows:

　　94HB: ordinary cardboard, not fireproof (lowest grade material, die punching, can not be used as a power board)

　　94V0: Flame retardant board (die punching)

　　22F: Single side half glass fiber board (die punching)

　　Cim-1: Single glass fiber board (must be computer drilling, can not die punching)

　　Cim-3: double-sided half-glass fiber board (in addition to double-sided cardboard is the lowest end of the double-panel material, simple double-panel can be used with this material, than FR-4 will be cheaper 5~10 yuan/square meter)

　　FR-4: double-sided fiberglass board