Kalrez® Spectrum™ 7275 Doubles Seal Life

Kalrez Spectrum 7275 is a perfluoroelastomer that provides long life sealing in an array of aggressive chemical environments that typically make sealing difficult: ethylene oxide, acrylic monomers, silanes and chlorosilanes, and strong oxidizers such as nitric acid, chlorine and chlorine dioxide.

It has demonstrated improved chemical and compression set resistance and mechanical property retention when compared to competitor’s elastomers.

Kalrez Spectrum 7275 is based on a proprietary cross-linking system, and is uniquely identified by its light brown shade.

Targeted applications include industries that depend on mechanical seals, pumps, valves, compressors, filtration columns and analytical equipment for their critical processes.


Success Story: Kalrez® Spectrum™ 7275 Double Seal Life in Chlorine Dioxide Service

Chlorine dioxide is a strong oxidizing gas that finds many uses as bleaching agent and disinfectant, being a more effective and safer biocide than other sources of chlorine. Most of the production of chlorine dioxide is used at paper mills for pulp bleaching.

picture of paper mill

A North American based paper mill had to perform frequent repairs in a pump handling chlorine dioxide in water. According to the reliability engineer, the incumbent non-black FFKM typically failed within 5 months of installation because of the extremely aggressive nature of the stream. With replacement of the seals by Kalrez® 7275, the pump seal life was extended to more than 12 months, removing the pump from the “bad actors” list and into a regular yearly maintenance.

Kalrez® Spectrum 7275, a specialty non-black perfluoroelastomer product, is made with a DuPont patented crosslinking system, and is suggested for seal applications where high resistance to oxidizing and reactive media is required.

picture of spectrum 7275 graph


The original article can be found on Dupont’s website here.

Gallagher Fluid Seals is a long-time partner of DuPont™, predominantly focusing on the Kalrez® line of products. For more information about Kalrez®, or a quote, contact Gallagher Fluid Seals today.