After the Space Shuttle Challenger disaster and the O-Ring failure in the rocket booster, is there now better material used rather than rubber for such O-Rings? - Quora
O-rings and back-up rings | SKF
O-Ring Groove Design | Seal & Design, Inc
Challenger O-Ring Failure: Breaking One Cause Into Causes
O-Ring Groove Design | Global O-Ring and Seal
O-Ring: What Is It? How Is It Made? Types Of & Common Uses