PTFE resin cleanliness
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In finished polytetrafluoroethylene resins, what causes yellow spots/dots to appear after sintering? I would appreciate some guidance from the experts here. What causes the black spots?
Is the temperature high? Or maybe the material is impure
We produce polytetrafluoroethylene, and the finished products often have yellow spots/dots; we’re not sure why:L
We don’t understand the issues related to production; we are just the users. Used for valves and pipes
:L{:3_65:}{:3_65:} Is no one coming?
This historical problem has remained unsolved; especially in the summers when temperatures rise and humidity increases, the occurrence of macular issues significantly increases. Personal analysis of possible reasons: The water content in the tetrafluoro monomer is higher than usual ； The purity of the tetrafluoro monomer decreases after distillation due to external temperatures. Polymerization-related issue (it’s possible that some of the polymers formed are too small, which can easily lead to premature sintering during the sintering process. Can the sintering time be shortened? ). It’s just my personal opinion; if you don’t like it, please don’t criticize: lol
:handshake thank you
The mold needs to be made of 304 material with an electroplated surface; issues such as raw material problems and process control problems exist
Hello! I also encountered the problem of yellowing in the polytetrafluoroethylene resin obtained during experiments. At first I used redox initiation, and later I tried thermal initiation; for a while, the polymer obtained through thermal initiation was quite transparent after sintering, but eventually both methods led to yellowing due to sintering