Hardness specifications balance sealing conformability against extrusion resistance. Softer compounds (60-75 Shore A) conform to surface irregularities providing superior sealing on rough surfaces. Harder compounds (80-95 Shore A) resist extrusion at high pressures. Application-specific hardness selection optimizes performance. Durometer testing verifies hardness specifications ensuri... https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/