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Our Best in Sealing and Isolation

The ISOFLEX™-FS flange isolation gasket employs the industry-proven metallic Flexpro seal design, with Flexitallic proprietary corrosion mitigating facing material, Corriculite®. The electrical isolation barrier is constructed using the aerospace material polyimide, located within the gasket core, shielded from any potential damage. ISOFLEX™-FS is fire safe per API 6FB standard, and has excellent sealing performance that exceeds MESC SPE 85/300-2017 fugitive emissions class A requirement.


The kit sleeves are available in a variety of materials including G10 and G11. The isolating washers are G10, G11, mica, or mica faced CRS. Metallic washers are zinc plated carbon steel.


  • Outperforms the spring energized seal in cycling applications
  • Dual serrated metallic cores (Flexpro®) halves
  • Faced with Corriculite™, a fire safe non-conductive sealing material
  • Separated by polyimide isolating film. Dielectric Strength of 3000 V/mil
  • Complete with NEMA grade glass reinforced epoxy (GRE) inner and outer rings
  • ISOFLEX™-FS is API 6FB Fire Safe. One gasket satisfies both general and fire safe services
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