Kalrez® Spectrum™ 7075

• Kalrez® Spectrum™ 7075 has enhanced physical properties including very low compression set and improved seal force retention.
• It is a carbon black-filled product utilizing proprietary cure chemistry.
• Its mechanical properties are designed for improved sealing performance in both high temperature environments and temperature cycling situations.
• Kalrez® Spectrum™ 7075 O-rings have a glossy finish.
• This product was specifically developed for the chemical and hydrocarbon industries to provide improved chemical and thermal resistance better than the industry standard set by Kalrez® 4079.

Thermal, Chemical, and Mechanical Performance

Kalrez® Spectrum™ 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). It is not suggested for use in severe aqueous and amine applications where Kalrez® Spectrum™ 6375 remains the preferred compound. As always, we recommend the specific chemicals, service temperature and pressure be reviewed for the optimal compound selection in each application.

Kalrez® Spectrum™ 7075 offers very low compression set as measured by ASTM D395 to predict heat resistance. DuPont compression set testing extends the standard ASTM 70-hour protocol to include 336 and 672-hour compression set testing, which better predicts long-term O-ring performance. Lower compression set results in improved sealing and longer service life.

Figure 1. Compression Set at 204°C

Test method: D395B, 214 O-ring

Figure 2 : Sealing force retention at 204°C

Test method: ISO 3384: 1991, method A, 214 O-ring

Performance Comparison

Kalrez® Spectrum™ 7075, with its low compression set, is a great choice for today's smaller and lighter mechanical seals, which are expected to perform as efficiently as larger mechanical seals. The smaller mechanical seal designs, with reduced spring force retention, put additional demands on elastomeric O-rings with reduced cross sections. The smaller cross section O-rings are more prone to compression set which can reduce their functional effectiveness, thereby reducing the operability of the mechanical seal.

Quick connector couplings also benefit from the outstanding compression set of Kalrez® Spectrum™ 7075 and its enhanced temperature cycling capabilities. Combined with low swell in a wide range of chemicals, this compound ensures reliable performance of modern fluids handling systems.

• [1]: DuPont proprietary test method; useful temperature range may vary with seal design and application specifics