Material Drying
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PTFE Compression Molding Bubbles
Problem Phenomenon
Bubbles appear inside or on the surface of PTFE compression molded products, concentrated in batches with insufficient pre-pressing, and bubbles appear and expand after sintering.
Cause Analysis
Insufficient pre-pressing pressure of 5~10MPa or insufficient holding of 1~2 minutes, air not fully removed; powder moisture content >0.03% vaporizes during sintering; uneven loading entrains air.
Solution
①Execute pre-pressing pressure and holding time according to specifications to remove air; ②Pre-dry raw materials to control moisture content ≤0.03%; ③Load uniformly to avoid air entrainment; ④Timely reject bubble-defective parts.
Key Takeaway
Pre-pressing degassing for PTFE bubbles is the primary process; 0.03% moisture content is the raw material red line; uniform loading prevents air entrainment.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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