Sour service wireline seals resist H2S embrittlement and sulfide stress cracking. NACE MR0175-compliant materials like peroxide-cured HNBR or FFKM prevent degradation. They undergo immersion testing in sour mixtures to verify property retention. Reliable sealing in high-sulfur wells protects personnel and equipment. https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/