Molding Process
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PVDF Temperature Upper Limit and Thermal Deformation
Problem Phenomenon
【Problem phenomenon】PVDF pipe fittings deform and creep during long-term use at conditions approaching 140-150℃, and pressure-bearing capacity declines
Cause Analysis
PVDF's long-term use temperature upper limit is about 140-150℃; near the upper limit, creep accelerates and pressure-bearing capacity declines; overtemperature selection or condition fluctuations beyond the limit lead to early failure
Solution
Design by checking the pipe supplier's long-term strength curve against actual working temperature and pressure; switch to PFA or metal lining for conditions near the upper limit; monitor temperature during operation to prevent exceeding the limit; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
140-150℃ is PVDF's service ceiling; near the upper limit, material change or derating is required; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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