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Home >> Seal >>O-Rings >> Kalrez O-Rings >> Kalrez Comparison of Compounds

Physical Properties Kalrez® perfluoroelastomer parts are available in a number of different compounds that are formulated to optimize properties to give the best possible performance in various applications. Modification of the finished properties is achieved by use of fillers and other additives.
This table summarizes the basic physical properties of the most commonly used Kalrez® products for the chemical and hydrocarbon processing industries. Descriptions of the key attributes for each product and their general areas of application follow.

Compounds Standard Specialty
6375 7075 4079 1050LF 6380 7090 0090 0040
Durometer Hardness (2),
Shore A, points +/-5 75 75 75 82 80 90 95 70
100% Modulus (3) PSI 1050 1100 1050 1800 1000 2250 2060 960
MPa 7.24 7.58 7.24 12.40 6.89 15.51 14.20 6.61
Tensile Strength at Break (3) PSI 2200 2600 2450 2700 2300 3300 2830 1990
MPa 15.16 17.91 16.88 18.60 15.86 22.75 19.51 13.72
Elongation at Break (3) % 160 160 150 125 160 75 80 180
Compression Set (4), %
70 hours at 204°C (400°F) 30 12 25 35 38 12 40 38
Tr10 (5) °C -3 -4 -2 -4 -5 -5 -7 -17
°F 26.6 24.8 28.4 24.8 23.0 23.0 19.4 1.4

(1) Not to be used for specifications  (2) ASTM D2240   (3) ASTM D412, 500 mm/min (20 in/mm)  (4) ASTM D395B pellets  (5) ASTM D1329




Standard Kalrez® O-Ring Compounds

Daemar DMR O-Rings Kalrez

Kalrez® Compounds – 4079

4079 perfluoroelastomer parts are a black, low compression set product for use in many dry and wet semiconductor process environments. It has excellent chemical resistance, good mechanical properties and outstanding thermal stability.


Kalrez® Compounds – 6375

6375 is designed to give outstanding performance in the widest possible range of chemicals and temperatures. This product is an excellent choice for use in acids, bases, amines, steam, ethylene oxide, and many other aggressive chemicals.


Kalrez® Compounds – 7075

7075 is designed for general-purpose use as O-rings or custom sealing components in the chemical and hydrocarbon processing industries. It is a carbon black-filled compound with mechanical properties designed for improved sealing performance in temperature cycling applications. 7075 has improved thermal resistance that extends maximum service temperature to 327 °C (620 F).


Kalrez® Compounds – 0090

0090 perfluoroelastomer parts deliver durable, reliable sealing solutions for applications requiring excellent rapid gas decompression (RGD) properties as well as high hardness and high modulus properties. Some application areas include downhole equipment such as drilling and completion tools as well as industrial equipment including pumps and valves.

Specialty Kalrez® O-Ring Compounds


Kalrez® Spectrum™ – 7375

Kalrez® Spectrum™ 7375 perfluoroelastomer parts are an innovative FFKM product based on a patented crosslinking system for chemical process industry applications where broad chemical and water/steam resistance are needed at elevated temperatures. Kalrez® Spectrum™ 7375 parts exhibit excellent compression set resistance, outstanding physical property retention, and good mechanical strength properties.


Kalrez® Compounds -6380

6380 is a non-black product specifically developed for chemical processes involving hot, aggressive amines. It has also been successfully used in applications involving highly oxidizing chemicals. In addition, it has excellent overall chemical resistance. This cream colored product is easily identifiable when selecting an O-ring material for harsh chemical plant services.


Kalrez® Compounds -7090

7090 is a product for uses requiring higher hardness/higher modulus than more typical applications. Kalrez® 7090 perfluoroelastomer parts are well suited for both static and dynamic applications as well as specific sealing applications requiring extrusion resistance at high temperatures.


Kalrez® Compounds -0040

0040 -is a black product specifically designed for low temperature environments where significant chemical resistance is required. Kalrez® 0040 parts maintain elasticity and seal force at temperatures unattainable by other perfluoroelastomers.




Kalrez® Compound – W240

Kalrez® W240 perfluoroelastomer parts are a black product for photovoltaic wet manufacturing processes requiring a wide range of chemical resistance. W240 provides an excellent combination of properties (resistance to acids/bases) and is the product of choice for wet processes as an upgrade from standard elastomers, i.e., FKM, NBR, EPDM, etc.




Kalrez® is a registered trademark of E.I. du Pont de Nemours and Company or its affiliates












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