LEADING METAL GASKETS MANUFACTURER, EXPORTER & SUPPLIER
Manufacturer, Exporter & Supplier of Premium Industrial Gaskets
At Sunflex Metalloy, we specialize in delivering advanced sealing solutions engineered to meet the evolving demands of modern industries. With a strong focus on quality, precision manufacturing, and material excellence, we have established ourselves as a trusted name in the field of industrial gaskets. Our expertise lies in understanding critical application requirements and providing customized gasket solutions that ensure safety, efficiency, and long-term reliability.
Sunflex Metalloy is a leading manufacturer and supplier of Copper Nickel (Cu-Ni) gaskets, offering high-performance sealing solutions for marine, offshore, oil & gas, power plants, and chemical industries.
Our Cu-Ni gaskets are known for their exceptional corrosion resistance, superior strength, and long service life, especially in seawater and harsh industrial environments.
We manufacture precision-engineered gaskets that ensure leak-proof sealing under extreme temperature and pressure conditions.
Grades Available: Cu-Ni 90/10 · Cu-Ni 70/30 · UNS C70600 · UNS C71500 · ASTM B466 / B151
Sunflex Metalloy manufactures all eight major Cu-Ni gasket types — each engineered for specific flange face configurations, pressure classes, and operating conditions.
Copper-Nickel Ring Type Joint (RTJ) gaskets are solid metallic sealing rings designed to seat into a precision-machined groove on RTJ flange faces, creating an exceptionally high-integrity metal-to-metal seal. As the flange bolts are tightened, the Cu-Ni ring deforms plastically into the groove, establishing a seal capable of withstanding extreme pressures, high temperatures, and aggressive fluid media.
Sunflex Metalloy manufactures Cu-Ni RTJ gaskets in both R-type (standard) and RX / BX type profiles to API 6A and ASME B16.20 specifications. The inherent corrosion resistance of Copper-Nickel ensures that RTJ gaskets in seawater-exposed systems remain free from corrosion-induced sealing failures for extended service periods.
Best For: Offshore wellheads · Subsea pipeline flanges · High-pressure process valves · Christmas tree assemblies · Deepwater production equipment
Copper-Nickel Spiral Wound gaskets are semi-metallic sealing elements constructed by spirally winding a thin Cu-Ni metallic strip alternately with a soft filler material — typically flexible graphite or PTFE — to form a robust, resilient sealing element. The spiral winding creates alternating metal and filler layers that compress under bolt load, accommodating surface irregularities, bolt relaxation, and cyclic pressure and temperature variations.
Sunflex Metalloy manufactures Cu-Ni spiral wound gaskets to ASME B16.20 in three standard configurations — with inner ring only, with outer ring only, and with both inner and outer centering/retaining rings.
Best For: Marine heat exchangers · Offshore process piping · Petrochemical reactor flanges · Power plant steam lines · Desalination plant pipework
Copper-Nickel Corrugated Metal gaskets are manufactured by forming a Cu-Ni sheet into a series of concentric corrugations — creating multiple raised contact ridges across the gasket face. When compressed under bolt load, these ridges bite into the flange surface and deform slightly, creating multiple independent sealing lines that significantly enhance leak tightness compared to a flat gasket of the same material.
Cu-Ni corrugated metal gaskets can be supplied plain or with a soft overlay layer — typically flexible graphite or PTFE — which further enhances conformability and surface fill for improved sealing performance.
Best For: Marine heat exchangers · Pressure vessels · Glass-lined or fragile equipment flanges · Process columns · Low bolt load flange connections
Copper-Nickel Metal Jacketed gaskets consist of a soft, compressible filler material — typically ceramic fibre, flexible graphite, asbestos-free compressed fibre sheet, or PTFE — completely enclosed within a formed Cu-Ni metal jacket. The outer Cu-Ni jacket provides mechanical protection to the filler, resists the corrosive process fluid and environment, and gives the gasket its structural rigidity and dimensional stability.
Metal Jacketed gaskets in Copper-Nickel are particularly well-suited for heat exchanger channel covers, pressure vessel manway covers, and large-diameter flanges where surface finish may not be ideal.
Best For: Heat exchanger channel covers · Pressure vessel manway sealing · Large-diameter process flanges · Aged or worn flange surfaces · Marine vessel equipment
Copper-Nickel Solid Metal gaskets are manufactured entirely from solid Cu-Ni bar or sheet stock — no filler material, no composite layers, just pure metal from face to face. This all-metal construction gives solid Cu-Ni gaskets the highest mechanical strength and temperature resistance of any gasket form in the range, making them suitable for the most extreme service conditions.
Sunflex Metalloy manufactures solid Cu-Ni gaskets in flat ring, lens ring, oval, octagonal, and custom machined profiles — to standard dimensions or fully custom specifications from your engineering drawings.
Best For: High-pressure steam systems · High-temperature process flanges · Pressure vessel closures · Subsea and deepwater sealing · Maximum sealing reliability applications
Copper-Nickel Lens Ring gaskets are precision-machined solid metal sealing rings with a distinctive convex spherical (lens-shaped) cross-section profile. The lens ring gasket seals through line contact — the convex spherical profile contacts the matching concave conical seat in the flange face at a single circular line of contact, concentrating sealing stress to a very high level even at relatively low bolt loads.
Cu-Ni Lens Ring gaskets are widely used in high-pressure gas and oil pipeline systems, compressor stations, and instrumentation connections where operating pressures may reach several hundred bar.
Best For: Ultra-high-pressure gas and oil pipelines · Compressor station flanges · High-pressure instrumentation connections · Subsea and wellhead applications
Copper-Nickel 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 in Cu-Ni 90/10 and 70/30 across all API ring numbers and custom dimensions.
Best For: Offshore production platforms · Oilfield wellheads and Christmas trees · Subsea pipeline flanges · High-pressure process block valves
Copper-Nickel Kammprofile gaskets feature a solid Cu-Ni metal core with a series of concentric serrated grooves machined into both faces to a precise profile geometry. These serrations are typically covered with a thin layer of soft sealing material — most commonly flexible graphite or PTFE — that bonds to the grooved core surface. When compressed under bolt load, the serrated ridges cut into the soft overlay material, creating multiple high-stress sealing lines across the gasket face.
The solid metal core also makes Kammprofile gaskets highly blowout-resistant and reusable — in many cases, only the soft overlay layer needs replacement at maintenance — a significant advantage in heat exchanger and pressure vessel applications.
Best For: Marine and offshore heat exchangers · Pressure vessel nozzle flanges · Desalination plant equipment · Applications requiring reusable gaskets to reduce maintenance cost
Not sure which Copper-Nickel gasket type is right for your application? Use this comparison to match your operating conditions to the right gasket form.
| Gasket Type | Pressure Class | Temp Range | Flange Face Type | Reusable | Best Application |
|---|---|---|---|---|---|
| Ring Type Joint (RTJ) | Class 600–2500 | Up to 400°C | RTJ Groove | No | Offshore wellheads, subsea pipelines |
| Spiral Wound | Class 150–2500 | Up to 400°C | RF, FF, T&G | No | Process piping, heat exchangers |
| Corrugated Metal | Class 150–900 | Up to 350°C | RF, FF | No | Pressure vessels, low bolt load flanges |
| Metal Jacketed | Class 150–900 | Up to 400°C | FF, RF, MF, T&G | No | Heat exchanger covers, large flanges |
| Solid Metal | Class 150–2500 | Up to 400°C | All types | No | Extreme service, high-temp/pressure |
| Lens Ring | Ultra-high pressure | Up to 400°C | Concave conical seat | No | High-pressure pipelines, compressors |
| Octagonal / Oval Ring | Class 600–2500 | Up to 400°C | RTJ Groove | No | Oilfield, offshore, wellhead flanges |
| Kammprofile | Class 150–2500 | Up to 400°C | RF, FF, MF, T&G | Yes (core) | Heat exchangers, process vessels |
All Copper-Nickel 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.
