(Kalrez® is a DuPont Performance Elastomers registered name)

Available products: O-rings, Vulcanised joined cord rings, Washers, Gaskets, Sheet, Mouldings

Perfluoroelastomers are terpolymers of monomers in which all hydrogen atoms have been replaced by fluorine. These compounds combine the resilience and sealing force of an elastomer with the chemical inertness and thermal stability of PTFE.

Characterised by its exceptional chemical resistance and thermal stability for temperatures ranging from -25°C to in excess of 320°C. Application areas where the compound is often used: Chemical processing, Pharmaceutical and food industries, Oil and gas, Hydrocarbon processing, Semiconductor fabrication, Lacquer, print and coatings, Aerospace and Power generation.

May be used for Should not be used for
Concentrated organic and inorganic acids
Strong alkalis and bases, Alcohols, aldehydes
Ketones, esters, ethers
Halogens and strong oxidising media
Hydraulic and fuel oils, fuels (e.g. Skydrol®)
Most organic solvents, Hot water / steam
CIP / SIP cleaning media
Aliphatic and aromatic amines
Ethylene oxide and propylene oxide
Molten Potassium
Molten Phosphorus
Molten Sodium

General purpose Perfluoroelastomer (FFKM) O-rings are commonly stocked, however the sizes are somewhat limited and are usually inch based O-ring sizes (BS1806/AS568A). We offer washer and gasket products in FFKM, however these would be considered a special order. FFKM is the most expensive elastomer family and usually is only used for applications where there is no other solution possible.