Brass-reinforced seals dominate high-pressure Fig. 1502 applications, where the metal ring embeds in the elastomer to counter extrusion forces at 15,000 psi. HNBR with brass backups offers 1,200 psi tensile strength, resisting proppant erosion in fracking. The ring's phosphor bronze alloy prevents galvanic corrosion in saline muds. Qinuo Seals' brass designs test to 22,500 psi without... https://globalsealstech.com/product/hammer-union-seal-2/