Scanning for Ideas: Flexible fluoropolymer hose fit for sanitary applications
Edited by Stephen J. Mraz
When it comes to hoses for moving liquids in sanitary or clean processes, silicone has been the material of choice based on its flexibility. Now engineers at Swagelok Co., Solon, Ohio, have developed a way to add a wide-braid stainless-steel reinforcement layer that helps the hose resist kinking and contain pressures. The layer is added to the company’s Coreflex U Series hose with a patented, glue-free process, so there’s no chance of adhesives leeching through the hose walls and causing contamination. And instead of silicone, the hoses uses fluoropolymer, which has better chemical compatibility than silicone. In U Series hoses, the fluoropolymer takes the form of perfluoroalkoxy (PFA). Like most fluoropolymers, it is inert, nonaging, nonstick, easy to clean, and can withstand repeated steam cleanings. Its absorption rate is also low.
For the U Series, sizes range from 0.5 to 2 in., with working pressures up to 300 psig. The hose withstands temperatures from –65 to 450°F. A silicone cover gives the hose a noncontaminating, easy-to-clean surface and insulates liquids from temperature changes. It meets FDA and USP regulations (21CFR Part 177.1550 and <87, 88> Class VI, respectively). Customers can order a carbon black-filled core for static dissipation. And custom hose lengths and end connections are also available.