- Normal temperature punching is possible
- Resin ratio : X - 35% , XX - 45% , XXX - 58%
- An electric and physical characteristic is
lowered
- No Flame retardant (UL 94HB)
S/S
FR-1
- A feature like as XPC
- Flame retardant (UL 94V-O)
S/S, STH
FR-2
- More contained the resin than FR-1
- Flame retardant (UL 94V-O Grade)
S/S
CEM-1
S:Glass cloth + Epoxy
C:Paper + Epoxy
- More measure stability than FR-1,FR-2
- Highly -hygroscopic
S/S, STH
CEM-3
S:Glass cloth + Epoxy
C:Glass web + Epoxy
- A similar characteristic with FR-4
(But measure stability is low - half of FR-4)
STH, CPTH,
PTH
FR-4
Glass cloth + Epoxy
- An electrical, physical and chemical
characteristic is high
- Not Press punching → CNC processing
- An electrical, physical and chemical
characteristic is high
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