Sealing/Isolating Gaskets and Flange Isolation Kits

The ISOMATE™ sealing/isolating gasket is designed for basic applications where electrical flange isolation and corrosion control are required on pipes containing water/wastewater, gas, natural gas, oil, and other hydrocarbon-based medias up to 175°F (79°C).

Available for flat face and raised face joint flanges from 1/2” to 24”, ANSI 150-300#, PN 20-50, the ISOMATE™ gasket is an economical solution for basic performance. The ISOMATE™ sealing/isolating gasket consists of a phenolic retainer faced on both sides with nitrile rubber material.


ISOMATE™ gaskets are designed to provide reliable sealing and electrical isolation for wide variety of basic applications.The industry has improved sealing technology in retainer type gaskets with engineered seal elements and groove designs. DEFENDER™ and ISOGUARD™ sealing systems should be reviewed, specified, and used when a long-term maintenance-free solution is necessary.

General Features

  • Sealing and Isolating Gasket
  • Type E or F Gaskets

Retainer Materials

  • Phenolic
  • Retainer Thickness 1/8” (0.125”) (3.18 mm)

Note: Operating temperature for gaskets and flange isolation kits are based off the gasket retainer temperature. Seal element temperature does not dictate the minimum and maximum gasket operating temperature.

Seal Element Materials

  • Nitrile
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