Hydrostatic pressure testing with water or oil-based test fluids provides initial verification of seal effectiveness and helps identify gross leakage or assembly defects, though liquid testing alone may not reveal potential issues with gas sealing, RGD susceptibility, or performance at elevated temperatures. Gas pressure testing with nitrogen or helium offers more stringent evaluation... https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/