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CCL also know as PCB laminate is the very base material of PCB, currently the main suppliers in the world is from eastern Asia, like Taiwan, Japan, Korean, and Mainland China. Famous manufacturers are KB, Shengyi, Dusan, Panasonic etc.
Main factors affect PCB laminate quality are glass transition temperature Tg, coefficient of thermal expansion (CTE), PCB decomposition temperature Td, heat resistance, electricity conduction and PCB water absorption.
If Tg(glass transition temperature) is lower, high temperature will make PCB distorted and components damaged. So to select PCB laminate, we have to make sure that Tg is higher than circuit work temperature.
For lead free soldering, PCB laminate CET should be much lower. CTE of direction Z does big impacts on soldering of metal hole. What’s more, SMT requires PCB not distorted even for second reflow soldering.
Regarding electricity conduction, there are some special values for dielectric constant2.5, dielectric loss0.02, dielectric strength (breakdown voltage > 40kV for 0.5mm thickness PCB), insulation resistance>10^4 M OHM, volume resistance>10^3 M OHM* cm, Anti-arc erosion performance>60s, water absorption0.8%.
