String wound cartridges used as filter material are manufactured especially for the filtration technology. Apart from polypropylene and natural cotton, PROSES T.I.M. produces a wide-range of filters made from polyester, white cotton, nylon, glass fiber, and acrylic filter yarns as well. with all micron rates used in any liquid filtration process, like: water, dairy, medical, oil, petroleum, etc... String wound filters are produced in 5", 9.75", 10", 20", 30", 40", 50" with a PP body core and also SST core.