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Kalrez or FFKM Rubber O Rings - Polymax

Orings in KALREZ

KALREZ® (FFKM) Rubber O-rings

This material has outstanding chemical resistance and a temperature capability up to +350°C (intermittent). Wherever rubber components are exposed to aggressive chemicals or high temperatures Kalrez® Perfluoroelastomer parts last longer. Kalrez® parts have virtually universal chemical resistance. They are far more resistant to swelling, a key cause of seal failure, and other forms of chemical attack than other lastomers. Kalrez® has the chemical inertness of P.T.F.E. and the elasticity of rubber.

Temperature Range -50°C to +315°C

Viton® and Kalrez® are registered trademarks of DuPont Performance Elastomers LLC

Kalrez® 7075

A new compound with enhanced physical performance properties including very low compression set (15% O-rings per ASTM D 395B) and improved seal force retention. It is a carbon black filled compound utilising new and proprietary cure chemistry technology with mechanical properties designed for improving sealing performance in both high temperature environments and temperature cycling situations.

7075 joins the family of Kalrez ® Spectrum ™ products designed for the chemical processing industry. To provide even greater sealing performance in dynamic applications where low friction is required, 7075 O-rings have a glossier finish than other Kalrez ® parts. 7075 was specifically developed to be used as an O-ring or custom-sealing component in the chemical and hydrocarbon industries, with an improved thermal resistance that extends maximum service temperature to 327°C (620°F). Kalrez ® Spectrum ™ 7075 offers the enhanced elastomeric properties outlined above while providing a chemical resistance better than the industry standard set by Kalrez ® 4079.

Kalrez® 7075 TECHNICAL PROPERTIES
Durometer Hardness : 75 Shore A points ±5(ASTM D2240)
100 % Modulus : 7.58 (1100) ASTM D412, 500 mm/mm (20in/mm)/ Mpa (psi)
Tensile Strength at Break : 17.91 (2600) % ASTM D412, 500 mm/mm (20in/mm)/Mpa (psi)
Elongation at Break : 160 % ASTM D412, 500 mm/mm (20in/mm)
Compression Set : 12 % at 70 hrs at 204°C (400°F)(ASTM D395B, pellets)
Maximum Service Temperature : 327 (620) °C (°F)

Kalrez® 4079

A low compression set compound for general-purpose use in O-rings, diaphragms, seals and other parts used in the process and aircraft industries. It is a carbon black-filled compound with excellent chemical resistance, good mechanical properties and outstanding hot air aging properties. It exhibits low swell in organic and inorganic acids and aldehydes and has good response to temperature cycling effects. A maximum operating temperature of 316ºC (600ºF) is recommended, with short excursions to higher temperatures possible. This compound is not recommended for use in hot water/ steam applications or in contact with certain hot aliphatic amines, ethylene oxide and propylene oxide.

Kalrez® 4079 TECHNICAL PROPERTIES
Durometer Hardness : 75 Shore A points ±5(ASTM D2240)
100 % Modulus : 7.2 (1050) ASTM D412, 500 mm/mm (20in/mm)/ Mpa (psi)
Tensile Strength at Break : 16.9(2450) % ASTM D412, 500 mm/mm (20in/mm)/Mpa (psi)
Elongation at Break : 150 % ASTM D412, 500 mm/mm (20in/mm)
Compression Set : 25 % at 70 hrs at 204°C (400°F)(ASTM D395B, pellets)
Brittle point : -50 (-58) °C (°F)
Maximum Service Temperature : 316 (600) °C (°F)

Kalrez® 6375

A carbon black-filled compound for general use in O-rings, seals, diaphragms and other specialty parts specifically for the chemical process industry. This compound has excellent, broad chemical resistance, good mechanical properties, and outstanding hot-air aging properties. 6375 is well suited for mixed process streams because of its excellent resistance to acids, bases, and amines. In addition, it is the suggested compound for use in hot water steam, ethylene oxide and propylene oxide. A maximum service temperature of 275ºC (525ºF) is recommended.

Kalrez® 6375 TECHNICAL PROPERTIES
Durometer Hardness : 75 Shore A points ±5(ASTM D2240)
100 % Modulus : 7.2(1050) ASTM D412, 500 mm/mm (20in/mm)/ Mpa (psi)
Tensile Strength at Break : 15.1(2200) % ASTM D412, 500 mm/mm (20in/mm)/Mpa (psi)
Elongation at Break : 160 % ASTM D412, 500 mm/mm (20in/mm)
Compression Set : 30 % at 70 hrs at 204°C (400°F)(ASTM D395B, pellets)
Maximum Service Temperature : 275 (527) °C (°F)