Epoxy boards are commonly used in the electronics and electrical industry, known for their high-temperature resistance, corrosion resistance, wear resistance, lightweight, and insulating properties. Different models of epoxy boards have varying high-temperature capabilities; the operating temperature typically ranges around 150℃, with the best ones capable of reaching up to 200℃. So, how can one determine if an epoxy board has reached the specified temperature?
Heating-induced deformation observed in insulating board

Heating the epoxy board

During the heating process to a certain temperature, deformation occurs, mainly including bending, shrinking, expansion of insulating boards, and warping. Once the temperature exceeds the range, internal stress changes, and the shape of the epoxy board alters, making it impossible to revert to its original form.

2. Heat-induced stratification occurs
We understand that epoxy boards are a type of composite material, consisting of a laminated structure with layers of glass fiber fabric and resin. If the temperature becomes too high, the adhesive strength of the resin is compromised, leading to delamination. Therefore, if delamination occurs during the heating process of the epoxy board to the specified temperature, it indicates that the board has not reached the required temperature and does not meet the standards.

Cracking occurred during the heating process.

Heating tests on the epoxy board revealed that if cracks appear on the surface of the board as it heats to the specified temperature and the thickness of these cracks gradually deepens, the board will crack if the temperature is not lowered promptly. This phenomenon adequately demonstrates that the epoxy board has not reached the specified temperature and is therefore an不合格 product. Insulating board