Epoxy board is a commonly used electronic and electrical material, which has the characteristics of high temperature resistance, corrosion resistance, friction resistance, light weight and insulation. The high temperature resistance of different types of epoxy boards is different. The most commonly used temperature is about 130℃-150℃, and the high temperature resistance can reach more than 200℃. So, how to judge whether the epoxy board has reached the specified temperature?
1. Heat the epoxy
board
Deformation occurs
when heated to a certain temperature: mainly including bending, shrinking,
expansion, and warping of the insulating board. Once the temperature exceeds
the range, the internal stress changes, and the shape of the epoxy board
changes, and it cannot be restored to its original appearance.
2. Delamination on
heating
We know that epoxy
board is a composite material. It is a laminated structure, a layer of glass
fiber cloth and a layer of resin. If the temperature is too high, the bonding
force of the resin will be destroyed, leading to delamination. Therefore, when
the epoxy board is heated to the specified temperature, if the epoxy board is
delamination, it means that the epoxy board has not reached the specified
temperature and does not meet the requirements.
3. Cracking on
heating
Perform a heating test on the epoxy board. If you see a gap on the surface of the epoxy board during the heating to the specified temperature, and the thickness gradually deepens, it will crack directly if the temperature is not lowered in time. This phenomenon can also fully explain that the epoxy board has not reached the specified temperature and is a substandard product.
4. Blushing on
heating
As we all know, the
colors of epoxy boards are mostly yellow, aqua and black. It can be said that
the color change directly reflects the defense of the internal performance of
the epoxy board. If during the heating test of the epoxy board, it has not
reached the specified temperature, it is a bad phenomenon that the epoxy board
gradually turns white. It can be said that there is a problem with the quality
of the product.