The primary material used to fabricate PCBs (Printed Circuit Boards) is of immense
importance. It is essential to consider the performance of the material in terms of
temperature resistance, adhesion, tensile strength, flexibility, dielectric strength,
dielectric constant, and many other physical, electrical, and thermal factors. The
performance and level of integration of the PCB is completely dependent on the material
used to fabricate the PCB.
Types of Materials Used for PCB Fabrication
This is the most commonly used material in PCBs. It is a glass reinforced epoxy laminate
sheet. The epoxy used is flame retardant and water resistant. It provides good strength
to weight ratios. The tensile strength offered by this material is very high.
PTFE is a kind of plastic material that does not provide any resistance, thus is used
for high speed, high frequency applications. PTFE is extremely flexible, making it
invaluable in applications with tight tolerances. It is also extremely lightweight,
allowing it to be used across various industries. It is also flame resistant, exhibits
high physical strength, provides temperature stability, and is versatile in application.
The traditional materials of copper, aluminum, iron, etc. are still used in PCBs. These
materials allow the use of Surface Mount Technology (SMT) for the integration of
components. They also provide mechanical durability. Thus, the product life of metal
base PCBs is much longer.