O-rings dominate Downhole Tool seals for static and semi-dynamic applications, molded in HNBR or FKM for pressures to 15,000 PSI. Their toroidal shape ensures 360° sealing in grooves, energized by compression. Backup rings prevent extrusion in high deltas. FFKM O-rings resist 1,800+ chemicals at 300°C, ideal for HPHT wells. Low compression set ( https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/