Flexseal Chemical Couplings are made from the following components: 1 x EPDM rubber body, 1 x stainless steel shear band, 2 x stainless steel clamp bands, 2 x strips of PTFE tape, 1 x FEP liner.
By using the above components, Flexseal Chemical Couplings provide resistance to the broadest range of chemicals possible.
The FEP liner and PTFE seals are chemically inert and solvent resistant to most chemicals with the exception of molten alkali metals, fluorine at elevated temperatures and other complex halogenated compounds, for example, chlorine trifluoride, at elevated temperatures and pressures.
In situations of extreme temperatures, 80% sodium hydroxide, metal hydrides, aluminium chloride, ammonia and certain amonios (R-NH2) may attack the film in a manner similar to molten alkali metals.
Although special testing may be required when such extreme reducing or oxidizing conditions are evident, the FEP liner and PTFE seals exhibit a very broad range of chemical and thermal serviceability. Final selection should be based on functional evaluations or experience under actual end use conditions.