From recently, how to distinguish FR-4 epoxy plate
and sum together mix harmonious CEM-1 insulating plate
There are always some bad merchants to use CEM-1 such insulated panels to serve as FR-4, causing many consumer rights to be illegal. In order to help more customers from being harmed, we give you a part about how to distinguish Fr-4 epoxy plates and CEM-1 insulating panels, hoping to help everyone.
First we see the division of the insulating board substrate, a phenolic paper-based insulating plate, which generally can be made of punching, low cost, low price, relative density, but because of its working temperature, moisture resistance And the heat resistance is not good, therefore belongs to a lower level of insulating plate; the other is the epoxy glass fiber sheet, the FR-4 epoxy plate is such a sheet, and its raw materials are imported into imported electronic grams. The fiber cloth is made in the production of important substrates for multi-layered printed circuit boards, and the process performance has a large market advantage; the last one is the composite substrate of CEM-1, it is wood pulp fiber paper or cotton Plasma fiber paper as a core material reinforcing material.
So how do this FR-4 epoxide plate and CEM-1 insulating plate? From the price, there is no doubt that FR-4 is most expensive, and it is basically yellow color, but there are also white, black and other colors. From the surface we have almost impossible to determine the differences, but from the tomography, the cut surface of the FR-4 epoxide plate has a gray-white glass fiber cloth, and the CEM-1 fault is a white resin, both of which are distinguishes As the cement plate and the reinforced cement board. At the same time, the toughness of the FR-4 epoxide is much better than the CEM-1 insulating plate, and the heat dissipation performance is also the best.