Comparing FFKM to FKM, the former's full fluorination doubles chemical resistance, handling ketones where FKM fails. Thermal limits extend 100°C higher. However, FKM suffices for 80% of apps at 1/10th cost. FFKM's lower compression set aids dynamic seals. EPDM lags in oils but excels in weather. Selection hinges on exposure: FFKM for extremes, FKM for standard. Greene Tweed charts gui... https://globalsealstech.com/ffkm-seals/