FR4 PCB circuit board manufacturer,how to distinguish between ordinary PCB or high frequency PCB

The high-frequency PCB circuit board is usually pressed with FR4 fiberglass PCB circuit board, and is pressed by a whole piece of epoxy glass cloth. The whole PCB circuit board is uniform and bright in color. The density is larger than the low-frequency board, which is the weight point.

Many low-frequency PCB circuit boards are made of low-end materials, such as paper substrates, composite substrates, epoxy PCB circuit boards (also known as 3240 epoxy PCB circuit boards, phenolic PCB circuit boards), FR-4 glass fiber PCB circuit boards (separation PCB circuit boards), and paper substrates. And the composite substrate, the overall density is low, the back color is the same, but it is easy to see that there is basically no glass fiber cloth inside the substrate. The difference between the epoxy board and the FR4 glass fiber PCB circuit board is that the color of the back substrate is different. The epoxy PCB circuit board is cut at the break, with a hand or other tool, it is easy to see the white powder, the color is beige of. The FR4 PCB circuit board is easier to see because it is pressed with the trim of FR4 fiberglass cloth and a large strip of stripe can be seen on the back of the PCB circuit board.