FFKM Kalrez 4079 O-Ring, Size: -326
Material: FFKM Kalrez 4079 O-Ring
Size: AS568 -326 O-Ring
Part Number: KP4079-OR-326
Kalrez® (Dupont)
4079
FFKM (Perfluoroelastomer)
75
Shore A
Color: Black
Detailed Description
KP4079-OR-326 is a Black, 75 Shore A, FFKM (Perfluoroelastomer) O-Ring made from Kalrez® (Dupont). KP4079-OR-326 is AS568 size -326 O-Ring also referred to as 5.33mm (Cross Sectional Diameter (CS)) x 40.64mm (Inside Diameter (ID)).
Material: FFKM Kalrez 4079 O-Ring
Size: AS568 -326, 5.33mm CS X 40.64mm ID (0.210" CS X 1.600" ID)
| Technical Specification | Value |
|---|---|
| Compound Number | KP4079 |
| Brand | Kalrez® (Dupont) |
| Material | FFKM (Perfluoroelastomer) |
| Color | Black |
| Durometer | 75 Shore A |
| High Temperature | 316 °C / 601 °F |
| Low Temperature | -19 °C / -2 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | O-Ring |
| Size Standard | AS568 |
| Size | -326 |
| Cross Section (CS) | 5.33 mm / 0.210 in |
| Inside Diameter (ID) | 40.64 mm / 1.600 in |
DuPont™ Kalrez® 4079 (KP4079) is a 75 Shore A black perfluoroelastomer (FFKM) designed as a true general-purpose sealing material for chemically aggressive, high-temperature environments. Carbon black filled for improved mechanical strength, it offers excellent resistance to a wide range of organic and inorganic chemicals, including acids, alkalis, oils, solvents, alcohols, esters, ketones, and ethers, while maintaining low and stable compression set at elevated temperatures. Kalrez® 4079 has a maximum continuous service temperature of 315°C (599°F), with short excursions to higher temperatures possible, and demonstrates outstanding hot air aging and resistance to thermal cycling. Its relatively low modulus also aids installation and assembly compared to higher-stiffness FFKM grades.
Kalrez® 4079 is widely used for O-rings, gaskets, diaphragms, seals, and custom molded parts across chemical processing, semiconductor support systems, aerospace, and general industrial applications, covering the majority of non-steam FFKM use cases. It is not recommended for hot water or steam service, high-temperature aliphatic amines, or exposure to ethylene oxide or propylene oxide. For applications requiring steam or amine resistance, other FFKM grades are typically selected. Canyon Components offers equivalent general-purpose FFKM materials engineered to match the chemical resistance, thermal stability, and mechanical performance profile of Kalrez® 4079.
Common relevant keywords:
Kalrez 4079, KP4079, general purpose FFKM, 75 Shore A perfluoroelastomer, chemical resistant FFKM O-rings, high temperature FFKM seals, low compression set elastomers, acid resistant rubber seals, solvent compatible O-rings, industrial perfluoroelastomer gaskets, non-steam FFKM material, Kalrez 4079 alternative, Datasheet, TDS, Test Report, MTR, MSDS, SDS