Product Code:SAE AMS7284/1 Title:Rings, Sealing, Phosphonitrilic Fluoroelastomer (Fz) Aviation Fuel Resistant 65-75 Shore A Issuing Committee:Ams Ce Elastomers Committee Scope: This specification covers a phosphonitrilic fluoroelastomer (FZ) in the form of molded rings. Primarily for use in aircraft fuels systems operating from -55 to +150 degrees C (-67 to 302 degrees F). Rationale: This specification covers a phosphonitrilic fluoroelastomer (FZ) in the form of molded rings. Primarily for use in aircraft fuels systems operating from -55 to +150 degrees C (-67 to 302 degrees F).