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Kalrez® 7075

New Kalrez® Spectrum™ 7075 seals deliver longer service life initial force!

Advantages Kalrez ® 7075

New Kalrez® Spectrum™ 7075 parts from DuPont™ Performance Elastomers deliver longer service life and enhanced sealability. They have an extremely low compression set and a higher thermal resistance allowing processing at service temperature of up to 327ºC. With excellent thermal cycling and an even better chemical resistance than Kalrez® 4078, Kalrez® Spectrum™ 7075 is the ideal sealing solutions for many applications in chemical and hydrocarbon processing. So if you want to reduce downtime, maintenance costs and increase MBTR while improving productivity, try new Kalrez® Spectrum™ 7075 and find out what it can do for you and your business.

Ask ERIKS

For more information on Kalrez ® 7075 or our other products please visit our contact page or fill the “Ask ERIKS” form on the upper-right corner.

Typical Physical Properties 1
Hardness, Shore A ± 5
(range 70-80 Shore A)75
100% Modulus 2, MPa (psi)7.6 (1100)
Tensile at break, MPa (psi)17.9 (2600)
Elongation at break, %160
Compression set, %
70 hr at 204°C (400°F) 315
70 hr at 204°C (400°F) 412
Maximum service temperature, °C (°F)327 (620)
Lower service temperature, °C (°F)-20 (-4)


  1. Not to be used for specifactions
  2. ASTM D412, 500 mm/min
  3. ASTM D395B, O-rings
  4. ASTM D345B, pellets


Compression Set at 204°C

kalrez spectrum compression

Kalrez ® Spectrum™ 7075 designed specifically for the needs of the chemical and hydrocarbon processing industry

Kalrez® Spectrum™ 7075 broadens the family of Spectrum™ sealing solutions with a compound that has enhanced physical performance properties. The sealing force retention of Kalrez® Spectrum™ 7075 is about 10% better than Kalrez® 4079. To provide even greater performance in applications where low friction is required, Kalrez® Spectrum™ 7075 O-rings have a glossier finish than other Kalrez® parts. It is a carbon-black filled compound with mechanical properties designed for improving sealing performance in temperature cycling applications. All this results in improved sealing and longer service life.

Sealing Force Retention at 204°C

kalrez spectrum sealing force retention

Advancements in Polymer Technology Have Improved Chemical Resistance of Elastomers 

kalrez spectrum sealing force retention

Initial field test reports confirm: Kalrez® Spectrum™ 7075 is the ideal choice for difficult sealing environments. Initial field test reports substantiate our performance expectations for Kalrez® Spectrum™ 7075.

ApplicationChemicalsTemperaturePrevious materialResults
Mechanical sealsMultiple chemicalUp to 300°CVarious FFKMs testedKalrez® Spectrum 7075 chosen as an environments upgrade from Kalrez® 4079 because the mechanical properties of Kalrez® Spectrum 7075 allowed the manufacturer to use lower spring tension and smaller components for seal design innovation
Quick disconnectsMarlotherm® LH270°C for 1008 hKalrez® 407950% reduced volume swell combined with a low coefficient of thermal expansion provides reliable on/off performance
ProprietaryNot applicableCycling between 200°C and 350°CNew application Various elastomers testedKalrez® Spectrum 7075 was the only elastomer that could be used for several hundred cycles due to its sealing force retention
Hot glue application nozzleSolvents100 - 250°CKalrez® 4079 and Kalrez® SpectrumTM 6375 testedMechanical properties and chemical resistance of Kalrez® Spectrum 7075 reduced variability of glue flow in the nozzle
Rotary joint assemblyHot oil200 - 300°CKalrez® 4079Better sealing performance

Ask ERIKS

For more information on Kalrez ® 7075 or our other products please visit our contact page or fill the “Ask ERIKS” form on the upper-right corner.

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