EPDM suits aqueous Downhole Seal Stacks in waterfloods, resisting steam to 150°C with ozone tolerance. Low cost for retrievable tools. In O-ring stacks, it handles chlorides without cracking. Drawbacks: poor oil resistance, limited to non-hydrocarbon zones. Blends with peroxides enhance cross-linking. California steam injection fields report 90% uptime with EPDM. (500 characters) Syn... https://globalsealstech.com/media/