I work for a valve manufacturing company and our customers have an application where very large volumes of hot (200F), dry air pass through our valve. As a consequence, the rubber (carboxylated nitrile) sealing surfaces within the valve harden, eventually leading to the valve being inoperable.
While I am no polymer expert, is seems obvious to me that the plasticizers are being “cooked” out of the rubber. I am looking for a cost-effective alternative rubber material that will remain elastic/pliant in this challenging application. We offer valves that use PTFE, but this would be unacceptable to our customers from a cost perspective.
Any thoughts or guidance would be greatly appreciated.