The high temperature resistance of carbon fiber depends on the environment - it can withstand high temperatures above 2000°C in an inert atmosphere, and will obviously oxidize and fail above 400°C in an air environment. The core depends on the protective atmosphere and specific type.  1. High temperature resistance performance in different environments Inert atmosphere (nitrogen, argon): Ordinary PAN-based carbon fiber can withstand 1500-2000°C, high modulus or graphitized carbon fiber can withstand more than 2500°C, only slightly pyrolyzes at high temperatures, and maintains good mechanical properties.  Air environment: It is basically stable below 400°C, starts to slowly oxidize at 400-500°C, and burns and decomposes rapidly above 600°C, eventually turning into carbon dioxide and completely losing its mechanical properties.  Special media (vacuum, reducing atmosphere): The high temperature resistance is close to that of inert atmosphere. The vacuum environment can reduce heat loss and oxidation risk, and is suitable for use in higher temperature scenarios.  2. Core factors affecting high temperature resistance Carbon fiber type: PAN-based (mainstream) has lower high-temperature resistance than asphalt-based and viscose-based. Carbon fiber after graphitization (more regular crystal structure) has higher temperature resistance than non-graphitized carbon fiber.  Surface treatment: Carbon fiber with coating (such as silicon carbide, boride coating) can increase its high temperature resistance to 600-1000°C in the air environment. The coating can isolate oxygen and prevent oxidation.  High temperature duration: short-term (several seconds to minutes) can withstand higher instantaneous temperatures, long-term high temperature (more than several hours) will accelerate pyrolysis or oxidation, and the upper limit of temperature resistance will decrease significantly.  3. Temperature reference in practical applications High-temperature scenarios such as aerospace and industrial kilns: need to be equipped with an inert atmosphere or protective coating, and the operating temperature can be controlled at 800-1500°C.  Daily or general industrial scenarios (such as automobiles, wind turbine blades): no special protection is required, the operating temperature usually does not exceed 200°C, and long-term exposure to environments above 300°C is avoided.