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Inner and outer rings can be fitted which are used for centralizing the gaskets on the face of the flange and protecting the inner windings against erosion. They also act as a compression stop. Maxiflex Spiral Wound gaskets can be manufactured using a range of filler materials according to different service condition.
Maxiflex gaskets can be manufactured to meet all of the international standards such as ASME B16.20, DIN and customer specific requirements.
Flange Surface Finish
Maxiflex gaskets are capable of giving an excellent seal over a wide range of flange surface finishes, but as a general guide we suggest the following:
| Duty | Roughness | |
| General | 3.2-6 3µm | 125-250µ” |
| Critical | 3 2µm | 125µ” |
| Vacuum | 2.0µm | 80µ” |
| Winding Material | Maximum temperature |
| Carbon steel | 500°C |
| 304 Stainless steel | 650°C |
| 316L Stainless steel | 800°C |
| Duplex UN S 31803 | 800°C |
| 347 Stainless steel | 870°C |
| 321 Stainless steel | 870°C |
| Monel 400 | 800°C |
| Nickel 200 | 600°C |
| Titanium Gr2 | 500°C |
| Titanium Gr7 | 500°C |
| Hastelloy B-2/B-3 | 700°C |
| Hastelloy C-276 | 700°C |
| Inconel 600 | 1000°C |
| Inconel 625 | 1000°C |
| Inconel X 750 | 1000°C |
| Incoloy 825 | 600°C |
| Zirconium | 500°C |
| Super Duplex | 600°C |
| Alloy 20 | 600°C |
| Other grades of steel available on request. | |
| Filler Material | Maximum and minimum temperature |
| Graphite | -200 to 500°C |
| PTFE | -196 TO 260°C |
| Mica | 1000°C |
| Mica & Graphite | 900°C |
| Ceramic | 1200°C |
