w KALREZ is an amorphous low modulus rubber whereas TEFLON is a crystalline high modulus plastic. In fluid environments where high permeation occurs, KALREZ will probably swell to a greater extent than TEFLON even though the polymer is not chemically attacked.
What is Kalrez material?
Kalrez® 1050LF is a carbon black-filled product for O-ringsO-ringsAn O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.https://en.wikipedia.org › wiki › O-ringO-ring - Wikipedia, seals, and other parts used in chemical process industries. It has good hot water/steam, and excellent amine resistance. Designed for low-temperature environments where significant chemical resistance is required.
Why is Kalrez so expensive?
The name Kalrez® is a trademark of Dupont. The material is actually an improved version of Viton with 20% more fluorine in the chains, making it an extremely expensive per fluorocarbon elastomer.