What factors affect the chemical resistance of PEEK rods:
1. Continuous working temperature: All chemical and physical processes related to endurance will accelerate as the temperature rises. Therefore, the resistance of PEEK rods to chemical media generally decreases as the temperature increases. Therefore, this habit can be used to predict the long-term performance of plastics (example). If the storage test results are obtained at a higher temperature than required, the performance of the plastic can be estimated when it is exposed to a chemical medium at the required low temperature for a long time.
2. Mechanical stress: PEEK rods have a tendency to form stress cracks when they are in contact with corrosive media. Exposure to chemical media and mechanical stress-these two simultaneous occurrences will accelerate the development of cracks. This phenomenon is called "environmental stress cracking" (ESC). Stress cracks may completely penetrate the wall of the plastic part, forming a crack surface.
3. Climate influence: PEEK rods exposed to sunlight and weather conditions for a long time will be affected by the biochemical effects of atmospheric oxygen, resulting in fading, brittleness and loss of mechanical properties. This will also affect the resistance of plastics to chemical media.
4. Fire resistance: Does the peek rod need to meet the specific fire resistance requirements in the application, and it must also have a higher chemical resistance. Flame retardants will affect the chemical resistance of the material.
5. Conductivity: In many applications, materials must not only have excellent chemical resistance, but also must have good conductivity. This is important, for example, when storing media with low ignition points (for example, heating oil, gasoline, and lubricating oil). Related additives also affect the chemical resistance.
