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Kalrez Industrial O-Ring Compounds

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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 utilizing 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 327C (620F).  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 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 an inorganic acids and aldehydes and has good response to temperature cycling effects.  A maximum operating temperature of 316C (600F) 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 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 275C (525F) is recommended.

Kalrez 1050LF
A general-purpose compound for O-rings, seals, and other parts used in chemical process industries.  It has good hot water/steam, excellent amine resistance, and enhanced compression set properties.  Maximum recommended service temperature of 288C (550F).  Not recommended for use in organic or inorganic acids at high temperatures.

Kalrez 1058

A carbon black-filled compound that has been plasticized with a perfluorinated oil.    It is the softest, lowest modulus compound available.  Generally, it is similar in chemical resistance to Compound 1050LF; it has an upper service temperature of 260C (500F).  Typically used in applications that require how sealing force or high extensibility including liquid chromatography septa, seals/seats for relief valves and tubing.  Its shrinkage is greater than other Kalrez compounds; therefore, finished parts may differ from standard specifications.

Kalrez 3018

A carbon black-filled compound similar to Compound 1050LF, except for higher hardness/modulus.  This compound offers the best hot water/steam resistance and the best high pressure extrusion resistance.  Generally used in oil field and process industry applications where these properties coupled with good amine and general chemical resistance are required.  A maximum service temperature of 220C (428F) is recommended.

Kalrez 2035

A carbon black-filled compound that is well suited for selected applications in the finishings equipment, pharmaceutical, semiconductor, and chemical transportation markets.    Compound 2035 has excellent chemical resistance exhibiting low swell in organic acids, inorganic acids, esters, ketones, and aldehydes.  This compound is suggested for use in the ethylene oxide and propylene oxide applications.  It also offers good mechanical properties.  A maximum service temperature of 220C (428F) is recommended.

Kalrez 2037

A non-black-filled compound that is well suited for selected applications in the pharmaceutical, semiconductor, and other markets that demand high purity elastomers.    Compound 2037 has excellent chemical resistance exhibiting low swell in organic acids, inorganic acids, esters, ketones, and aldehydes.  It also offers good mechanical properties.  A maximum service temperature of 218C (425F) is recommended.
 

Miscellaneous Kalrez Properties

Many miscellaneous properties are of interest for specific applications.  Some of these are unaffected by compound choice, while others vary with hardness or extensibility.    As an example, coefficient of friction typically increases as hardness decreases.   In general, miscellaneous physical properties are similar to those of Viton fluoroelastomer.
 
Note: Other specialty or custom compounds may be available or developed to applications that require different properties than the above compounds offer: 8375, 8385, 8101, 4001......

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Typical Phisical Properties*

Kalrez Compound 7075 4079 6375 1050LF 1058 3018 2035 2037

Durometer Hardness,
Shore A, points 5
(
ASTM D2240)

75 75 75 82 65 91 85 79

100% Modulus, psi/MPa
(ASTM D412, 500 mm/mm (20in/mm))

1100/7.6 1050/7.2 1050 / 7.2 1800/12.4 675/4.7 2450/16.9 1250/8.6 900/6.2

Tensile Strength at Break, psi/MPa
(ASTM D412, 500 mm/mm (20in/mm))

2600/17.9 2450/16.9 2200/15.1 2700/18.6 1300/9.0 3150/21.7 2500/17.2 2450/16.9

Elongation at Break, %
(ASTM D412, 500 mm/mm (20in/mm))

160 150 160 125 180 125 150 200

Compression Set,
% at 70 hrs at 204C (400F)
(ASTM D395B, pellets)

12 25 30 35 40 35 25 27

Brittle Point, C / F
(ASTM D746)

  -50 / -58   -41/ -42 -40 / -40 -37 / -35 -54 / -65 -54 / -65

The information set forth herein is furnished free of charge and is based on technical data that DuPont Dow Elastomers believes to be reliable.  It is intended for use by persons having technical skill, at their own discretion and risk.  The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present no health or safety hazards.  Because conditions of product use and disposal are outside our control, we make no warranties, express or implied, and assume no liability in connection with any use of this information.  As with any material, evaluation of any compound under end-use conditions prior to specification is essential.  Nothing herein is to be taken as a license to operate under or a recommendation to infringe on any patents.

*Not to be used for specifications

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Kalrez is a registered trademark of DuPont Dow Elastomers