Squeeze
O-Ring Groove & Gland Design Guide
How to design an O-Ring gland: squeeze, gland fill, groove width, clearance gap, and surface finish, for static and dynamic seals.
O-Ring Sealing Principles: How an O-Ring Seals
How an O-Ring seals: initial squeeze, pressure energization, and elastic recovery, and why too little or too much of each causes a leak.