There are many types of materials for PCB.

• Reinforcement

FR-1, FR-2, FR-3 (cotton paper impregnated with epoxy resin)

FR-4 (a glass fiber woven fabric impregnated with epoxy resin), FR-5

CEM-1 (cotton paper and epoxy resin), CEM-3 (non-woven glass and epoxy resin)

Ø RCC (for HDI board - high-density interconnect board)

Ø Other: metal core plate, ceramic plate, thermoplastic substrate

• Resin

Ø Phenolic resin

Ø Epoxy resin

Ø BT resin

Ø PI resin

• Flame retardant performance

ØUL91-VO, UL94-V1

ØUL94HB