Metal-end-cap (MEC) seals bond elastomer between steel caps for extreme extrusion resistance in high-clearance glands. The caps mechanically support the elastomer, preventing flow into gaps under pressures exceeding 25,000 psi. HNBR or FFKM cores provide sealing, while caps add durability in abrasive or HPHT environments. https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/