Elastomeric seals in API 6A equipment include O-rings, S-seals, FS-seals, and T-seals for secondary sealing in hangers and spools. Materials like HNBR, FKM, FFKM, and AFLAS provide chemical resistance to H2S, CO2, amines, and hydrocarbons. These seals meet immersion testing per Appendix F using sour gas mixtures for material classes DD/EE and FF/HH. Low compression set and RGD resista... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/