Stronger and more rigid than Torlon 4301 and 4203 because they’re filled with glass, these Torlon 5030 rods are also electrical insulators like Torlon 4203. In addition, the glass prevents friction from wearing them down and temperature changes from expanding and contracting them. These rods are often made into electrical components that need to withstand extreme temperatures. But, they aren’t good as bearings or bushings because the glass eats away at other materials.