Document Rp2EaKx11x1ONQzZaOLn00n7

Table 1 Partial seal applications at BSE in medical and aerospace industries Seal Applications Atherectomy catheter Surgical Drill motor Surgical Drill/Reamer Aircraft oxygen regulators Mine removal underwater vehicle Units sold 325k 7k 130k/125k 275k 50k Our spring-energized seals have exceptional properties that enable them to maintain performance in extreme conditions, and they are the key to innovation and excellence in these fields. The uniqueness of PTFE is one of the factors that made it happen. Hence, we respectfully urge you to exempt granular PTFE resins in the engineered seal industry from the PFAS restriction. Recognizing the specific characteristics and applications of individual materials within the PFAS group is vital to ensure that regulations are appropriately targeted and effective. By providing this exemption, you would not only safeguard the performance and reliability of essential equipment but also support the growth and sustainability of industries that rely on PTFE-based products. Thank you for your attention to this matter, and we remain available to provide any further information or clarification as required. We appreciate your consideration of our request and trust that you will make a well-informed decision that benefits both the industry and the environment. Sincerely, ? 3(41A1/9.0),S rishna Arkalgud Vice President of Engineering Bal Seal Engineering 19650 Paulin F A 92IM P M W: www.balseal.com Reference 1. Abunada, Z., Alazaiza, M. Y. D. & Bashir, M. J. K. An overview of per-and polyfluoroalkyl substances (Pfas) in the environment: Source, fate, risk and regulations. Water (Switzerland) vol. 12 (2020). 2. Radulovic, L. L. & Wojcinski, Z. W. PTFE (Polytetrafluoroethylene; Teflon). in Encyclopedia of Toxicology (Third Edition) (ed. Wexler, P.) 1133-1136 (Academic Press, 2014). 3. Lohmann, R. et al. Are Fluoropolymers Really of Low Concern for Human and Environmental Health and Separate from Other PFAS? Environ Sci Technol 54, 12820-12828 (2020). 4. Biswas, S. K. & Vijayan, K. Friction and wear of PTFE-a review. Wear vol. 158 (1992). 5. Kaur, B. et al. Controlled Methodology for Development of a PolydimethylsiloxanePolytetrafluoroethylene-Based Composite for Enhanced Chemical Resistance: A Structure-Property Relationship Study. ACS Omega 5,22482-22493 (2020). 6. Blanchet, T. A. Wear of Polytetrafluoroethylene and PTFE Composites. in Polymer Tribology 347374 . 7. Wang, Q., Zheng, F. & Wang, T. Tribological properties of polymers PI, PTFE and PEEK at cryogenic temperature in vacuum. Cryogenics (Guildfi 75, 19-25 (2016). 8. Theiler, G., Hilbner, W., Gradt, T., Klein, P. & Friedrich, K. Friction and wear ofPTFE composites at cryogenic temperatures 1. Tribology International vol. 35 (2002). 9. Henry, B. J. et al. A critical review of the application of polymer of low concern and regulatory criteria to fluoropolymers. Integrated Environmental Assessment and Management vol. 14 316-334 (2018). 10. Berry, K. L. & Peterson, J. H. Tracer Studies ofOxidation-Reduction Polymerization andMolecular Weight of 'Teflon' Tetrafluoroethylene Resin. 11. Tuminello, W. H. & Dee, G. T. Thermodynamics of Poly(tetrafluoroethylene) Solubility. Macromolecules vol. 27 (1994). 12. Pan, C. G. et al. Bioaccumulation and risk assessment of per- and polyfluoroalkyl substances in wild fresh m rivers in the Pearl River Delta region, South China. Ecotoxicol Environ Saf 107, 4).