Hydraulic fluid compatibility is paramount when selecting seals to prevent chemical degradation, swelling, or hardening. Petroleum-based fluids work with most standard elastomers including nitrile and polyurethane. Biodegradable fluids may require specialized compounds to prevent excessive swelling. Synthetic fluids like phosphate esters demand fluorocarbon elastomers. Water-glycol fl... https://globalsealstech.com/hydraulic-seals/