LEADING METAL GASKETS MANUFACTURER, EXPORTER & SUPPLIER
Manufacturer, Exporter & Supplier of Copper-Nickel, Stainless Steel & Alloy Industrial Gaskets
API-Standard Solid Metal Ring Seals for High-Pressure Offshore & Oilfield Flanges
Octagonal and Oval Ring gaskets are solid metallic ring seals designed specifically for use with Ring Type Joint (RTJ) flanges — the standard flange type in high-pressure oilfield, offshore, and wellhead applications. Both types seat into the precision-machined trapezoidal groove of an RTJ flange, creating a metal-to-metal seal through the plastic deformation of the gasket ring as bolt load is applied.
Sunflex Metalloy manufactures both profiles across all seven of our alloys, covering all API ring numbers and custom dimensions.
Available Materials: Copper-Nickel · Stainless Steel · Copper · Brass · Inconel · Monel · Hastelloy
Sunflex Metalloy manufactures Octagonal / Oval Ring Gaskets in seven premium alloys, so you can match the gasket material precisely to your process fluid, temperature, and corrosion requirements.
Copper-Nickel (Cu-Ni 90/10 / 70/30) is one of the most requested materials for octagonal / oval ring gaskets, offering outstanding seawater & biofouling resistance, with a maximum operating temperature of 400°C and a typical pressure rating of Class 150–2500 — making it the benchmark choice for marine, offshore & desalination duty.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Stainless Steel (SS 304 / 316 / 316L) is one of the most requested materials for octagonal / oval ring gaskets, offering excellent general & chemical corrosion resistance, with a maximum operating temperature of 600°C and a typical pressure rating of Class 150–2500 — making it the most versatile, cost-effective all-round choice.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Copper (C11000 / ETP) is one of the most requested materials for octagonal / oval ring gaskets, offering good ductility & soft-sealing conformability, with a maximum operating temperature of 250°C and a typical pressure rating of Class 150–1500 — making it low-to-medium pressure sealing with excellent conductivity.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Brass (CZ108 / C36000) is one of the most requested materials for octagonal / oval ring gaskets, offering moderate corrosion resistance, good machinability, with a maximum operating temperature of 200°C and a typical pressure rating of Class 150–900 — making it economical general-duty & instrumentation sealing.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Inconel (600 / 625 / 718) is one of the most requested materials for octagonal / oval ring gaskets, offering exceptional oxidation & high-temperature resistance, with a maximum operating temperature of 1000°C+ and a typical pressure rating of Class 150–2500 — making it extreme heat, cryogenic & superalloy-grade service.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Monel (400 / K-500) is one of the most requested materials for octagonal / oval ring gaskets, offering outstanding resistance to acids & seawater, with a maximum operating temperature of 480°C and a typical pressure rating of Class 150–2500 — making it hydrofluoric acid & chemical processing duty.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Hastelloy (C276 / C22) is one of the most requested materials for octagonal / oval ring gaskets, offering extreme resistance to highly corrosive/oxidizing media, with a maximum operating temperature of 1000°C+ and a typical pressure rating of Class 150–2500 — making it the premium choice for the harshest chemical environments.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Not sure which material is right for your octagonal / oval ring gaskets application? Use this comparison to match your operating conditions to the right alloy.
| Material | Pressure Class | Max Temp | Flange Face Type | Reusable | Corrosion Resistance |
|---|---|---|---|---|---|
| Copper-Nickel | Class 150–2500 | Up to 400°C | RTJ Groove | No | Outstanding seawater & biofouling resistance |
| Stainless Steel | Class 150–2500 | Up to 600°C | RTJ Groove | No | Excellent general & chemical corrosion resistance |
| Copper | Class 150–1500 | Up to 250°C | RTJ Groove | No | Good ductility & soft-sealing conformability |
| Brass | Class 150–900 | Up to 200°C | RTJ Groove | No | Moderate corrosion resistance, good machinability |
| Inconel | Class 150–2500 | Up to 1000°C+ | RTJ Groove | No | Exceptional oxidation & high-temperature resistance |
| Monel | Class 150–2500 | Up to 480°C | RTJ Groove | No | Outstanding resistance to acids & seawater |
| Hastelloy | Class 150–2500 | Up to 1000°C+ | RTJ Groove | No | Extreme resistance to highly corrosive/oxidizing media |
All Octagonal / Oval Ring Gaskets manufactured by Sunflex Metalloy conform to internationally recognized material, dimensional, and quality standards. We supply to EPC contractors, project engineers, and maintenance teams across India and internationally — with complete documentation packages.
