1. Normal working temperature range of Bakelite insulated boards
– The normal operating temperature range of insulated bakelite board is -40℃ – 120℃. Within this temperature range, its physical and insulating properties remain basically stable. This is because the structure of the components such as phenolic resin and wood flour that make up bakelite boards do not change significantly in this temperature range. For example, in some conventional indoor electrical equipment, such as small transformers, circuit boards, etc., the heat generated during its normal operation usually does not cause the temperature at which the bakelite boards are located to exceed this range, so it is able to play a stable insulating role.
2. Bakelite insulating board low-temperature performance
– When the temperature is lowered to -40 ℃, insulating bakelite boards are still able to maintain a certain degree of flexibility and insulating properties. This is due to the fact that the phenolic resin itself does not become too brittle and hard at low temperatures, and the chemical bonds in its molecular structure are able to resist the effects of low temperatures to a certain extent. However, if the temperature continues to drop, it may cause the toughness of the bakelite board to drop, making it more susceptible to rupture when subjected to external forces, but this is rarely the case in general use environments.
3. High Temperature Performance of Bakelite Insulated Boards
– In terms of high temperatures, bakelite panels begin to show some signs of performance changes when approaching 120°C. As the temperature rises, the phenolic resin may gradually soften, which can affect the mechanical strength of the bakelite board. For example, its compressive and flexural strengths may decrease, and bakelite boards that were originally able to withstand a certain amount of pressure or bending force may deform at high temperatures. At the same time, high temperatures may also have a certain impact on its insulating properties. Although there may not be any obvious insulation failure in a short period of time, if it is exposed to high temperatures for a long period of time, its insulation resistance may decrease and its dielectric constant may change. When the temperature exceeds this range more, for example, to reach 150 ℃ or more, bakelite board may appear obvious thermal decomposition phenomenon, the release of some gases, and completely lose its original physical and insulating properties.
