Verify the official specifications.
Examine the product specification sheet for the cable first. Key temperature resistance indications, such as long-term operating temperature and short-term tolerate temperature, shall be prominently shown by reputable manufacturers.
Examine the cable's printed markings directly. The temperature resistance rating (such as "200℃" or "500℃") and the matching certification standard number will be printed immediately on qualified high-temperature cables. Regular PVC cables do not specify high-temperature characteristics; they only indicate the voltage specification.
Check the Type of Insulation Material
Insulation materials including silicone rubber, PTFE/FEP fluoroplastics, fibreglass, and mica tape are frequently used in high-temperature resistant cables because they can function steadily for prolonged periods of time in temperatures between 150°C and 600°C.
Typical PVC insulated cables can only tolerate temperatures between 70°C and 105°C. They are totally inappropriate for high-temperature settings since they will rapidly melt and soften over this point.
Check Usage Condition and Appearance
Examine the cable sheath's state. Significant deformation, discolouration, or a softening and stickiness of the insulation layer following usage in the relevant high-temperature environment is a symptom that the product's high-temperature resistance performance falls short of expectations.
Reliable high-temperature resistance is demonstrated by cables that have not encountered insulation breakdown or signal drift problems over extended operation in comparable high-temperature environments, according to historical usage records under comparable operating conditions.
Professional Performance Verification: To ensure that the cable's temperature resistance parameters match the nominal values and steer clear of misrepresented parameters, ask the manufacturer for third-party performance test reports for the cable at various temperatures.
In order to swiftly confirm the cable's actual temperature resistance capabilities, simulated overload high-temperature testing can be used to place the cable in an environment that is somewhat above the nominal temperature resistance for a brief amount of time and see if its insulation performance stays constant.
