What is the difference between PTFE-lined and PFA-lined?
Thread Content
RT: Why are electronic-grade HF pipes always lined with PFA?
PFA has good fluidity, making it easier to process into shapes. Its performance is also generally better than that of PTFE, and PFA is widely used abroad.
PFA is a thermoplastic that can be processed by melting, and it possesses acid and alkali resistance as well as high-temperature resistance that are almost identical to those of PTFE. During processing, there is no need to use additives containing metal impurities as is the case with PTFE; as a result, the amount of metal ions and impurity particles leached out from PFA is extremely low. For this reason, it is used in various acid, alkali, and electronic-grade reagents with metal ion concentrations as low as 10 to the power of -12. The production processes for domestic PFA raw materials, as well as those used by manufacturers to produce PFA linings, are not up to standard; therefore, they cannot meet the requirements of electronic-grade reagents. **As we strive to advance the semiconductor industry, it is hoped that domestic fluoropolymer companies will make greater efforts.
I see, got it. Thank you
I see, got it. Thank you
How is that possible? Our company has already worked on several electronic-grade HF projects, and I’ve never heard anyone say that our processing techniques are inadequate. Absolutely meets the usage requirements
I gave instructions, right? The order of 10 to the power of -12.
The last edit to this post was made by Myth/ty Taotao on 2017-12-5 at 09:05. As for those in China, I know of Shangpin and Dongfu, which have the necessary processing capabilities. One is from Taiwan and the other from the mainland, but the technology is Japanese.
PPT grade, mainly using tetrafluoro raw materials such as NEW PTFE, APV PTFE, and PFA
Due to HF’s strong penetration ability, PFA951HP PLUS offers relatively good resistance to penetration. However, there is also new PTFE available at a lower price; yet it still meets the requirements of both resistance to penetration and high purity. It is recommended to use PFA 951 HP PLUS