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Rubber in Engineering Group @ Clwyd - Sep 2018

Clwyd welcomed the Rubber in Engineering Group on Friday 21st September, more than 20 more

Polymer Types - FKM LT LT Fluoroelastomer pentamer containing fluorinated vinyl ether & methyloxyfluoroether...

Clwyd reference FKM LT
ASTM classification FKM

Very low temperature FKM contain a methyloxyfluoroether monomer in their structure, resulting in improved chemical resistance and improved low temperature performance compared to standard low-temperature (Type 3) FKM.

Typical applications Seals and gaskets for chemical processing, power and utilities subjected to very low temperature conditions.

Excellent high and low temperature resistance
Excellent resistance to oils and most non-polar solvents (including methanol)
Good resistance to acids and bases
Excellent ozone and weathering resistance


Lower chemical resistance than perfluoroelastomers (FFKM)
Higher cost than type 3 FKM

Available hardness range (Shore A) 60 - 95
Upper continuous service temp. (°C) 250
Min. temp. for sealing applications (°C) -40
Minimum non-brittle  temp.  (°C) -45
Tensile strength (up to) 20 MPa
Elongation at break (up to) 300%

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