Nitrile (NBR) seals suit mild downhole tools in shallow wells, resisting oils to 120°C and 5,000 PSI. Cost-effective for retrievable packers. Carboxylated NBR enhances tear strength in bonded seals. Limitations: swelling in aromatics, poor ozone resistance. In waterfloods, NBR O-rings seal injection mandrels. API 6A Class 2 compliance. Blends with Kevlar reinforce V-rings. California ... https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/