Printed circuit boards are fabricated by using tons of different materials. The most commonly used FR-4 standard fiber glass copper clads have few application oriented drawbacks. PCB poly is a high thermal resistant polyimide which has a high flexibility.
It is the most commonly used temperature resistant polymer. Kapton is used since 1950’s because it can handle -250 to +400°C which is really a good material for high temperature PCB poly. Military and space application use Kapton as an insulator and PCB laminate. Kapton is quite flexible and stretchable thus it can survive high physical vibration and stress.
Kapton is an electrical insulator due to its di-electric properties. PCB poly is resistant to static charge accumulation and noise conduction. So, it is used in high frequency and high-power applications to insulate the system form noises and external interference.
Light and flexible polyimide is very good at temperature resistant. PCB poly can handle peak temperatures up 300°C and an average temperature of 230°C, while FR-2 and FR-4 can only handle a maximum temperature of 103°C and 130°C respectively.
It is another key material in PCB poly production. It is mostly used in flexible PCBs. Pyralux even has a rigid clad board classification that can act as solid PCB and a flexible substrate. This is ideal for automobile circuit board application. Where a rigid substrate as well as adaptive material is needed.
Compared to regular fiberglass epoxy resin board, PCB poly is a little bit pricier sue to its better temperature resistant and reliable feature.