Viton/FPMFluorinated Elastomer FPM Brown FDA 21CFR 177.1680, EU1935/2004 FPM DetectableMetal Detectable FDA 21CFR 17.2600, EU1935/2004 FPM White FDA 21CFR 177.1680, 3A sanitary class I EU1935/2004 FPM EDAgainst explosive decompression FPM softSofter FPM 74shA