Metaflex Gaskets

Spiral wound gaskets have the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange rotation, flange face temperature variations, bolt stress relaxation and creep.

The gasket-sealing element consists of a pre-formed metallic winding strip with layers of a softer, more compressible sealing material which, during compression, is densified and flows to fill imperfections in the flange surfaces when the gasket is seated. The metal strip holds the filler giving the gasket mechanical resistance and resilience.

Our Metaflex gaskets can be manufactured from a range of filler materials according to different service conditions:

Filler Material Maximum
Temperature
ASME B16.20
Colour Coding
Graphite 550°C Grey stripe
PTFE 260°C White stripe
Nonas 350°C Pink stripe
Mica 1000°C Light Green
Mica & Graphite, Zonal 900°C N/A
Winding Material Maximum
Temperature
ASME B16.20
Colour Coding
Carbon Steel 500°C Silver
304 Stainless Steel 650°C Yellow
316L Stainless Steel 800°C Green
Duplex 800°C N/A
347 Stainless Steel 870°C Blue
321 Stainless Steel 870°C Turquoise
Monel 400 800°C Orange
Nickel 200 600°C Red
Titanium 540°C Purple
Hastelloy B-2 1000°C Brown
Hastelloy C-276 1000°C Beige
Inconel 600 1000°C Gold
Inconel 625 1000°C Gold
Inconel X-750 1000°C Light Grey
Incoloy 825 1000°C White
Zirconium 702 500°C N/A

Type R

  • Metaflex spiral wound sealing element
  • Wide choice of materials for filler and metal strip
  • Suitable for high pressure and temperature applications
  • Recommended flanges - tongue and groove, male to female and flat face to recess
  • General and critical duties

Type CR

  • Metaflex spiral wound sealing element
  • Solid metal outer ring used as a centring device and compression stop
  • Used mainly on raised face and flat face flanges
  • General duties

Type RIR

  • Metaflex spiral wound sealing element
  • Solid metal inner ring
  • High pressure temperature capability
  • Male to female flanges
  • General and critical duties

Type CRIR

  • Metaflex spiral wound sealing element
  • Solid metal inner & outer ring
  • Suitable for high pressure and temperature applications
  • Raised face or flat flanges
  • Prevents turbulence and erosion damage to flange
  • Prevents damage to the gasket bore and inner windings
  • Acts as a heat shield
  • Acts as a corrosion barrier
  • General and critical duties

Type RHD

  • Metaflex spiral wound sealing element
  • Covered with 0.5mm Graflex
  • Used on manhole covers
  • Low bolt load applications
  • Uneven sealing faces
  • Double integrity seal

Type R (For heat exchanger applications)

  • Metaflex spiral wound sealing element
  • A combination of inner and outer rings
  • The inner ring could have pass bars or could carry either a metal clad or soft gasket with pass bars
  • Manufactured to customer designs
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