In addition to temperature and pressure, what other factors will affect the performance and life of silicone rubber electric heaters?

In addition to temperature and pressure, the following factors will also affect the performance and life of the silicone rubber electric heater:
Material quality
Silicone rubber quality: High-purity, high-performance silicone rubber has better high temperature resistance, aging resistance, insulation and other properties. If the silicone rubber contains impurities or the quality is unstable, it may cause the heater to crack, harden, become brittle and other problems during use, affecting its performance and life.
Resistance wire material: The resistivity, high temperature resistance and oxidation resistance of the resistance wire are directly related to the heating effect and service life of the heater. For example, the selection of nickel-chromium alloy resistance wire with stable resistivity, high temperature resistance and oxidation resistance can ensure that the resistance value of the heater is relatively stable during long-term use, with high heating efficiency and not easily damaged by oxidation.
Packaging process
Cleanliness: During the packaging process, if the environment is not clean or there are impurities such as oil, dust and other impurities on the surface of the workpiece, it will hinder the good combination of silicone rubber and resistance wire and other components, forming weak points, resulting in local poor thermal conductivity, stress concentration and other problems, affecting the performance and life of the heater.
Uniformity: The uneven distribution of silicone rubber during packaging will cause performance differences in different parts of the heater. For example, the thicker areas of silicone rubber dissipate heat slowly, which is prone to overheating and accelerates the aging of the material; the thinner areas may not provide sufficient insulation and protection, making the resistance wire susceptible to external factors.
Curing time: The curing time of silicone rubber has an important impact on its performance. If the curing time is too short, the silicone rubber cannot be fully cross-linked and the performance cannot reach the optimal state; if the curing time is too long, it may cause the silicone rubber to age or deteriorate in performance.
Use environment
Working temperature range: Although the silicone rubber electric heating sheet has a certain working temperature range, if it works at extreme temperatures or beyond its applicable temperature range for a long time, it will accelerate the aging of silicone rubber and resistance wire, and reduce the performance and life of the heating sheet. For example, at too high a temperature, silicone rubber will accelerate aging, become hard and brittle, and the resistance wire is also prone to oxidation, deformation and other problems.
Humidity: A high humidity environment easily causes water vapor to condense on the surface of the heating sheet, resulting in a decrease in insulation performance and even causing faults such as short circuits. At the same time, water vapor may also penetrate into the silicone rubber, affecting its performance and accelerating the aging and corrosion of the material.
Chemical corrosion: If there are corrosive gases, liquids or other chemicals around the heater, they may react chemically with the silicone rubber and resistance wire, causing material damage and performance degradation. For example, acidic gases may corrode silicone rubber, causing it to lose its elasticity and insulation properties.
Electrical parameters
Voltage stability: Unstable voltage will cause the power output of the heater to fluctuate, making the heating temperature unstable. Too high a voltage may overload the resistance wire, accelerate its aging or even burn it; too low a voltage will prevent the heater from reaching the normal operating temperature, affecting the use effect, and will also have an adverse effect on the performance of the silicone rubber in the long run.
Current density: If the current density is too large, the resistance wire will generate too much heat and the local temperature will be too high, which will not only accelerate the aging of the resistance wire, but also cause the surrounding silicone rubber to be affected by the high temperature, accelerating aging and damage.
Mechanical stress
Installation method: When installing the heater, if it is installed too tight or too loose, it will cause mechanical stress to it. Too tight will cause the heater to be stretched or squeezed during operation, which may easily cause the silicone rubber to rupture and the resistance wire to deform; too loose may cause the heater to move and shake during use, causing local wear or poor contact.
Vibration and shock: During use, if the environment where the heater is located is subject to vibration or shock, the silicone rubber and resistance wire will be subjected to repeated stress, which can easily cause fatigue damage, resulting in cracking of the silicone rubber and breakage of the resistance wire, thus affecting the performance and life of the heater.