igus (East Providence, RI) offers DryLin R linear bearings. According to the company, they are optimized for aggressive environments. They feature patented dirt channels: grooved inlays on the bearing’s liner that prevent buildup. The bearing uses the liner’s individual glide pads to wipe away any excess media and move it into the contact-free areas. The glide sections then slide freely on the shaft that has been cleared of all contaminants. They are also self-lubricating, which eliminates the need for messy oil or grease.
Check out www.igus.com to learn more.