Understanding the different types of laminate for a printed circuit board is crucial for the design and development process your PCB manufacturer will go through. The type of laminate you choose will determine the stability and overall performance of your PCB.
The laminate of the PCB is what holds the layers together. Traditionally, there are four layers that make up the board: Substrate, Copper, Soldermask, and Silkscreen (from bottom to top). The laminates are developed by curing under pressure and temperatures of cloth using thermoset resin to create the final piece of uniform thickness.
When you see a type of laminate written out, it typically will look like this: FR-4 (with FR-4 being the most common material used). These numbers and letters are the characteristics of the laminate produced. Some of the important characteristics include: fire retardant, dielectric constant, loss factor, tensile strength, shear strength, glass transition temperature, and how much thickness changes with temperature (the Z-axis expansion coefficient).
The most commonly way for PCB classification is according to reinforced materials,
a. Paper base class (FR-1, FR-2, FR-3)
b. Epoxy Glass fiber cloth base class (FR-4, FR-5)
c. Composite epoxy material (CEM-1, CEM-3)
d. Lamination multilayer base class (RCC-Resin Coated Copper)
e. Special material base class (BT, PI, metal core board, ceramic board, etc.)
We offer PCB with various material base on customer requirement. Should you have any questions or need a quote regarding PCB fabrication, please feel free to contact PCBontime at any time, we love to hear from you.