Product yellowing/blackening (oxidative degradation)

White PTFE products show yellow or even black color. Discolored areas are mostly concentrated in the thick-wall core or high-temperature zone of the product, accompanied by a simultaneous decline in mechanical properties.

(1) Material stability aspect: oxygen in the oven oxidatively degrades PTFE during sintering; molecular chain breakage causes irreversible decline in material performance. (2) Temperature parameter aspect: uneven temperature with local hot spots triggering degradation; temperature deviation directly affects the physicochemical state and reaction progress of the material. (3) Material aspect: fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (4) Process aspect: control deviations of key process parameters cause the '2079851475616104453 to deviate from optimal conditions. (5) Equipment aspect: equipment precision and maintenance status affect the stable execution of process parameters.

(1) Material selection: use nitrogen or inert gas protected sintering; establish material selection evaluation standards and determine the optimal solution through comparative tests. (2) Formulation adjustment: reduce oxygen concentration in the sintering furnace, adjust gradually and verify the effect, ensuring that other performance indicators of the product are not affected. (3) Equipment maintenance: check and eliminate oven temperature hot spots., formulate regular inspection and maintenance plans to ensure the equipment is in optimal working condition. (4) Preventive measures: establish a sound process control standard and quality inspection system, and regularly review process data for continuous optimization.

This problem requires comprehensive analysis from multiple dimensions of materials, processes, equipment, and operation, and should be solved by systematically optimizing process parameters and the quality control system.