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Kalrez® 4079 perfluoroelastomer o-rings were introduced in the 1980’s. Kalrez o-rings are effective sealing elements in high-heat and aggressive chemical environments. Kalrez is “A” rated in more than 1800 chemicals and has a maximum continuous service temperature rating of 600°F/316°C.

Polymer Name: Perfluoroelastomer (FFKM)

Features: Chemical Resistant, High Hardness, High Temperature Strength, Low Compression Set, Low Temperature Strength, Very Good Heat Resistance

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Properties

Physical Properties
ValueUnitsTest Method / Conditions
Hardness83.0Shore AD2240
Temperature Retraction TR-10-2.0°CD1429
Elongation Break150.0%D1414
Tensile Strength (Break)2450.0psiD1414
Maximum Continuous Service600.0°F
Maximum Continuous Service316.0°C
Specific Gravity1.95g/cm3D297
Compression Set (25% Deflection at 70 Hours & 400°F/204°C, in Air)37.0%
Compression Set (25% Deflection at 70 Hours & 527°F/275°C, in Air)45.0%