Broaden your application horizons …

DuPontTM CIRLEX® polyimide maintains all the excellent performance characteristics – electrical, physical and chemical – of DuPont™ KAPTON®

Available in thicknesses starting at 8mil (.008”,.20mm)

Improved yields from large and custom sheet sizes

Ideal match for environmental extremes

UL® 94VO rated


For over 30 years Fralock has supplied high-quality materials for the global marketplace. We supply electrical insulating materials, pressure sensitive adhesives, films, foils and tapes for every application. We are equally known for our reputation as a world-class material converter.

CIRLEX® is the latest addition to our diverse product family. Made from 100% DuPontTM Kapton® adhesiveless polyimide film, CIRLEX® is a product that delivers performance and value for all your demanding material applications. Fralock is DuPont’s sole licensee for the production of CIRLEX® worldwide.


CIRLEX® – an all-polyimide sheet material – has been developed to fill the growing requirement for thick all-polyimide materials, stemming from a wide variety of industries such as automotive, aerospace, and electronics.

If you are looking to replace current applications using ceramic or Vespel®, or upgrade to a new high performance polyimide materials, CIRLEX® offers material flexibility and an expanded range of thickness options unattainable with cast resins or laminated constructions using adhesives. Offering the excellent chemical, physical, thermal and electrical properties of KAPTON® in thick sheet format is unique in today’s material marketplace.

Traditional laminates are notoriously unreliable at temperatures which exceed the Glass Transition (Tg) of the adhesives used in their constructions. You can count on CIRLEX®’s integrity at extreme temperatures, from cryogenic [-269°C (-452°F)] to as high as 351°C (664°F); and CIRLEX® polyimide is readily modified/machined by laser cutting, drilling, machining and chemical etching.


KAPTON® and CIRLEX® laminates use adhesiveless bonding technology unique in the marketplace today. Eliminate the adhesive and you eliminate the weak link in the chain.

Use of all polyimide bonding eliminates the adhesive interface where many problems occur. Polyimide is closely matched to the CTE of copper, and can also be used to bond many other metals with bond strengths typically > 10 pli.

If your application requires high temperature resistance, dimensional stability, low outgassing, durability, and solvent resistance; you need CIRLEX® polyimide laminates.

For additional information about us or to begin discussions on your project, click our Quote Request, or call 1-800-FRALOCK (372-5625)

CIRLEX® Data Sheet -PDF