As hydraulic systems shift away from mineral oils that are conventional towards biodegradable and synthetic fluids, sealing compatibility is now an extremely important and least understood aspects of reliability of the system. Seals that work flawlessly using mineral-based hydraulic oils will fail in a matter of weeks if the system is switched to an ester made of synthetic material or biodegradable fluid, not due to the seal being damaged, but due to the chemical composition of the fluid reacting differently with the structure of the elastomer's polymer.
Read more: https://whyps.com/hydraulic-seal-material-compatibility-with-synthetic-and-biodegradable-fluids
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