Now there’s a Manway Gasket that ends fugitive emissions, damaged gasket surfaces, and gasket blowouts, introducing the FLEX MW™.

The ability to be used in a wide range of surface finishes and operating pressures, and a gasket which is designed to stay in place during closing.
Eliminate problems with leakage, gasket surface damage, gasket blow out, damage to other equipment and/or personnel. The most important feature of the gasket is the high unit load generated by the narrow sealing area provides a considerably higher flange clamping pressure and a better seal at a lower clamping force.

*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.

Innovation to Application


Sizes: 12 x 16, 14 x 18, 16 x 18, 18 x 24, 20 x 24, 22 x 26

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

Surface Finish: 10 to 400 µin RMS

Sealing Track width: 0.125″ each side
Minimal sealing track web width: 0.375″

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)


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


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

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