Unlike leaky Double Jacketed gaskets, The FLEX HX is a cost-effective sealing solution designed to handle flange movements, vibrations, and a tighter seal that will not leak in Heat Exchanger applications.

Our reengineered FLEX Heat Exchanger gasket creates a high unit load that is generated by the narrow sealing area. This provides more flange clamping pressure and a better seal with less compression. It can’t be over-torqued. FLEX HX can be made in almost any shape or configuration.

*Flexitallic can manufacture custom metal carriers and sealing materials for your application.


  • Ability to cope against severe thermal cycling and vibration
  • Inherent Live Loading capability
  • Fire, Blow Out, & Leak proof
  • Superior pressure handling
  • Ease of installation Lower seating load
  • Cannot be over-compressed
  • No need to re-torque
  • Eliminates fugitive emissions

Cross Section Design

The metal gasket material with two (2) tracks of SEL + Flexible Graphite sealing elements. Specialty gasket material and/or sealing elements are available as options.

Leak-free Corrugated Metal Gaskets for Heat Exchangers, Manways, and Pipe Flanges. Gaskets are engineered to install easily, end emissions, and create a more effective seal with less compression.

Innovation to Application


Flange Pressure Class: 150# to 2500#

Thickness: 1/16″ (1.6mm) Other thicknesses available, contact engineering department for more details

Flange Surface Finish: 10 to 400 μin RMS (microinches)

Sealing Track Width:
• ½ to 1¼ (gasket size)0.100″ each side.
• ≥1½ (gasket size) 0.125″ each side.

Minimal Sealing Track Web Width: 0.670“
Leak Rate: 0.005 in mg/m ∙s (DIN 28090 / 1..2) < 10ppm @ He

Temperature Range: -328°F/-200°C cryogenic air +932°F/+500°C in regular atmosphere + 1202°F/+650°C in steam +1832°F/+1000°C reducing or inert media. Varies by material.

Pressure Range: Full vacuum to +5000 psi

Minimum Seating Stress: 2900 psi (20 MPa)




Maximum Seating Stress: 23,200 psi (160 MPa) (testing equipment limit)

Recommended Seating Stress: 5800 to 8700 psi (40 to 60 MPa)

Available Sizes for Flange Standards:

ANSI 16.5, DIN 2600, JIS B2220, BS 4505, BS 10, AUS 2129


  • Carbon Steel
  • MONEL®
  • Copper
  • AL6XN®(Stainless Steel)
  • 304 Stainless Steel
  • 316 Stainless Steel
  • 321 Stainless Steel
  • 347 Stainless Steel
  • Nickel
  • Titanium



  • SEL+ Flexible Graphite
  • PTFE
  • Thermiculite®
  • Corriculite™

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