Showdown in the test lab: plastic ball bearings compete against metal bearings in the salt water test09/11/2018
The engineers of the igus test laboratory filled a container with saltwater from the sea and heated it to +80 degrees Celsius. Then two bearings were put inside for 120 hours: a classic 2-hole flange bearing made of metal and a xiros flange bearing made of xirodur B180, a high-performance plastic that has been optimised by igus for years in terms of wear and media resistance. Both bearings were not completely covered in the test, but exposed to air in order to trigger the corrosion effect.
Metal bearing begins to corrode after a few hours
The test result spoke clearly in the end. After just a few hours, the metal bearing began to corrode. At the end of the test, significant traces of rust were visible on all bearing components. Unlike the bearing of plastic. The xiros flange ball bearing was unfazed even after 120 hours in the aggressive salt water and high temperatures. There is no colour change and no trace of rust. A clear advantage especially in cleanroom applications and use in food and medical technology, where rust poses a hygiene risk. The xiros ball bearings usually consist of four components: the inner and outer rings as well as the cages made of plastic and the balls made of stainless steel or glass. Unlike metal bearings, the wear-resistant polymer bearings enable a very smooth and hygienic dry operation without a single drop of lubricating oil and are maintenance-free. Their long service life can be easily calculated online. In addition, the plastic bearings are electrically insulating, temperature-resistant from -40 to +80 degrees Celsius, non-magnetic and 60 percent lighter and up to 40 percent more cost-effective than comparable metal bearings. They are suitable for absorbing medium loads and due to their reliability, have been preferred by customers around the world for many years, for example, for use in conveyor belts, labelling, handling and packaging machines as well as in filling machines.