1. Not water‑resistant, not high‑temperature resistant (long‑term <110°C).2. Brittle - can fracture under shock loads.3. Lubricant must be compatible with phenolic resin (avoid certain synthetic oils containing esters).4. Manufacturers provide speed limit curves (dn value charts) - they can be used for calculation.5. No standard life model - typically estimate as half the designed bearing life.
