Document Vj2zLOKMeO9wBmMJMVkb77vvj

ANNEX2Photo of seal in PPS (polyphenylene sulfide) On May 31, 2023, MITSUI E&S POWER SYSTEMS, INC. reported to Mitsubishi Chemical via email that it was having difficulty in finding a replacement for the zeolite membrane seal, FEP. The material is PPS (polyphenylene sulfide), which according to the manufacturer is resistant to IPA and ethanol, but the manufacturer's verification of continuous high-temperature use is at the level of 120C for 3 to 4 minutes, making it unsuitable for sealing zeolite membranes that are used at the level of 130C for several years. In addition, gaps remain in the folds, making it unsuitable for sealing zeolite membranes. The manufacturer said that it is impossible to produce a seal without folds due to operational reasons. And the thickness is also too thin at 75. Furthermore, when a heat gun is used to heat the film to 450C for heat shrinkage, there is a high risk that the film will melt.