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
