Extrusion & Post
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PTFE Excessive Porosity
Problem Phenomenon
Micro pores and voids exist inside PTFE products, seals leak, and the breakdown voltage of electrical insulation parts decreases.
Cause Analysis
Insufficient compression during molding means powder particles are not fully consolidated; air retention and insufficient degassing during powder filling or paste extrusion; insufficient sintering temperature and time means particles are not fully fused; paste extrusion lubricant not completely removed forms cavities.
Solution
①Apply uniform and sufficient pressure in molding; ②Fully degas powder or paste before processing; ③Ensure correct sintering temperature and holding time; ④Select compatible lubricants and effectively remove them before sintering.
Key Takeaway
PTFE porosity is the common enemy of mechanical strength and sealing performance; degassing and compaction are the two lines of defense for prevention; lubricant management is a unique subject of paste extrusion.
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