Molds & Tooling
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PPO Chemical Pipeline Corrosion Resistance Failure
Fenómeno do problema
PPO chemical pipeline fittings show stress cracking and leakage in use, and cracks propagate at medium contact areas.
Análise das causas
Although PPO has good chemical resistance, specific media may still erode it; internal stress and media synergistically induce stress cracking; molding defects such as weld lines become crack starting points; temperature and pressure working conditions exceed limits.
Solução
①Verify compatibility with the actual medium; ②low-stress molding to reduce cracking sensitivity; ③locate weld lines away from high-stress areas; ④use within working condition limits.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
PPO chemical applications must verify the specific medium rather than a general chemical resistance table; the superposition of stress and medium is the main cause of failure; design limit management is the long-term guarantee.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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