Material Drying
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COC Cracking in High Temperature and High Humidity Environment
Problem Phenomenon
COC products show surface microcracks in high-temperature and high-humidity storage or use environments; the cracks gradually expand and transparent parts become hazy and fail.
Cause Analysis
High temperature and high humidity accelerate COC surface aging and hydrolysis-related stress cracking; when the hindered phenol antioxidant in the formulation is insufficient, the protection ability is weak; areas with high internal stress become crack initiation points.
Solution
①Select stabilized grades containing 0.1~2% hindered phenol antioxidant; ②use a low-stress '2079851475616104453 to reduce the crack driving force; ③conduct damp heat aging verification according to the use environment; ④avoid high temperature and high humidity in storage.
Key Takeaway
COC damp heat cracking is protected by the dual protection of formulation stabilization and low-stress process; antioxidant content is a key indicator when selecting grades; damp heat verification cannot be omitted.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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