LEADING METAL GASKETS MANUFACTURER, EXPORTER & SUPPLIER
Manufacturer, Exporter & Supplier of Premium Industrial Gaskets
All Types of Industrial Brass Gaskets — Cost-Effective, Corrosion-Resistant Sealing for Plumbing, HVAC, Instrumentation & General Industrial Applications
Sunflex Metalloy is a precision manufacturer of industrial Brass gaskets — supplying all major gasket types in high-quality brass alloy grades CuZn30, CuZn37, and Naval Brass (CuZn30Sn1) to the plumbing and water supply, HVAC and refrigeration, instrumentation and metering, valve and fitting manufacturing, fire protection, and general industrial sectors. From standard flat ring and full-face gaskets to precision-machined Lens Ring, Ring Type Joint (RTJ), Spiral Wound, Kammprofile, Corrugated, and Metal Jacketed designs, we manufacture the complete range of brass sealing solutions to ANSI, ASME, DIN, BS, and custom standards — in both standard and fully custom dimensions.
Brass combines good corrosion resistance in freshwater, potable water, and atmospheric environments with excellent machinability, moderate mechanical strength, and natural ductility — making it a versatile, cost-effective alternative to copper and stainless steel for a broad range of low-to-moderate pressure general industrial, plumbing, and HVAC sealing applications. Every Sunflex Metalloy brass gasket is manufactured from certified raw material, dimensionally inspected, and available with full material test certificates (MTC) as per EN 10204 3.1 or 3.2.
Grades Available: CuZn30 (70/30 Brass) · CuZn37 (63/37 Brass) · Naval Brass CuZn30Sn1 · ASTM B36 · ASTM B121
Brass — an alloy of copper and zinc — has been one of the most widely used engineering metals in general industry for centuries, and its continued specification in industrial gaskets across plumbing, HVAC, instrumentation, and general process applications reflects its genuinely practical combination of properties. Brass gaskets offer good corrosion resistance in freshwater, potable water, compressed air, oil, and mild chemical environments — combined with natural ductility that allows the gasket to conform to flange surface irregularities under bolt compression, producing reliable sealing at moderate bolt loads.
The machinability of brass is among the best of any engineering metal — making it the preferred material for precision-machined gasket forms such as lens rings, solid machined ring gaskets, and instrument connection seals where tight dimensional tolerances and fine surface finishes are required at reasonable manufacturing cost.
For applications in or near marine environments where standard brass grades may be susceptible to dezincification, Sunflex Metalloy offers Naval Brass (CuZn30Sn1), a tin-bearing grade that provides significantly improved resistance to dezincification while retaining the general engineering properties of standard brass.
| Grade | Composition | Key Property | Typical Application |
|---|---|---|---|
| CuZn30 (70/30 Brass) | 70% Cu, 30% Zn | Best corrosion resistance in brass family, good ductility | General process gaskets, water systems, instruments |
| CuZn37 (63/37 Brass) | 63% Cu, 37% Zn | Highest machinability, moderate corrosion resistance | Precision machined gaskets, valve seats, fittings |
| Naval Brass CuZn30Sn1 | 70% Cu, 29% Zn, 1% Sn | Dezincification resistant, marine-adjacent service | Marine-adjacent piping, brackish water, coastal plants |
Sunflex Metalloy manufactures all eight major brass gasket types — each engineered for specific flange configurations, pressure classes, and application requirements across plumbing, HVAC, instrumentation, and general industrial service.
Brass Ring Type Joint (RTJ) gaskets are precision-machined solid brass sealing rings designed for use with RTJ flange faces — delivering a reliable metal-to-metal seal through the natural ductility and machinability advantages of the brass alloy. The brass ring seats into the precision-machined trapezoidal groove of the RTJ flange face under bolt loading, deforming plastically to conform to the groove walls and create a leak-tight metal-to-metal seal.
Brass RTJ gaskets are specified in water supply systems, gas distribution piping, general utility flanges, and instrumentation connections where the RTJ flange configuration has been adopted for standardization or operational reasons and where the operating conditions are within the service range of the brass alloy. Sunflex Metalloy manufactures brass RTJ gaskets in oval and octagonal profiles to ASME B16.20 across all standard API ring numbers and in custom dimensions.
Brass Spiral Wound gaskets are semi-metallic sealing elements constructed by spirally winding a thin brass metallic strip alternately with a soft filler material — typically PTFE or flexible graphite — to produce a resilient, self-energizing gasket assembly. The brass winding strip contributes the corrosion resistance, machinability, and material compatibility advantages of brass to the spiral wound gasket format — making brass spiral wound gaskets a cost-effective alternative to stainless steel winding for general process, HVAC, and plumbing applications.
PTFE filler is the standard choice for brass winding gaskets — providing chemical resistance, non-stick characteristics, and compatibility with the broadest range of process fluids encountered in general industry and HVAC service. Sunflex Metalloy manufactures brass spiral wound gaskets to ASME B16.20 in all standard sizes and custom dimensions.
Brass Corrugated Metal gaskets are manufactured by forming a precision brass sheet into a series of concentric corrugations across the gasket face — creating multiple raised contact ridges that concentrate the bolt load onto narrow sealing lines. The brass corrugation ridges deform under bolt compression, conforming to the mating flange surface and establishing multiple sealing lines that provide leak tightness at lower total bolt loads than flat gaskets of equivalent size.
Available plain (bare brass) for general service or with a PTFE overlay for enhanced chemical resistance and conformability. Sunflex Metalloy manufactures brass corrugated gaskets in CuZn30 and CuZn37 grades in standard and fully custom dimensions.
Brass Metal Jacketed gaskets consist of a compressible soft filler core — typically PTFE, compressed non-asbestos fibre (CNAF), flexible graphite, or ceramic fibre — enclosed within a formed brass metal outer jacket. The brass jacket provides the outer sealing surface and mechanical protection for the soft inner filler, while the soft inner filler delivers the compressibility and conformability required to produce an effective seal against flange surface irregularities at moderate bolt loads.
Available in single-jacketed and double-jacketed configurations, with filler selection matched to the temperature, pressure, and fluid compatibility of the specific application.
Brass Solid Metal gaskets are manufactured entirely from solid brass bar, rod, or sheet stock — a single-material, all-metal construction that delivers reliable, dimensionally stable sealing performance across the broad range of general industrial, plumbing, HVAC, instrumentation, and valve manufacturing applications where brass is the material of choice. The natural ductility of brass allows the gasket to cold-flow under bolt compression and conform to the mating flange surface, creating a reliable metal-to-metal seal without excessive bolt load.
Their excellent machinability makes solid brass gaskets the preferred form for precision-machined instrument connection seals, valve seat gaskets, and custom-profile OEM gaskets where tight tolerances and consistent production quality are essential requirements.
Brass Lens Ring gaskets are precision CNC-machined solid brass sealing rings with a convex spherical cross-section profile. The convex spherical outer surface contacts the matching concave conical seat in the mating flange or fitting face at a single circular line, concentrating the assembly load onto a very narrow contact area to generate high sealing stress. The natural ductility of brass allows this line contact zone to deform slightly under assembly load — widening the effective sealing area and creating a reliable, leak-tight seal particularly well-suited to instrumentation, hydraulic fittings, and precision process connections.
The machinability advantage of brass is especially significant for lens ring gaskets — the precise convex spherical profile, tight dimensional tolerances, and fine surface finish required can all be achieved efficiently and consistently in brass using standard CNC turning operations, at a lower manufacturing cost than equivalent lens rings in stainless steel.
Brass Octagonal and Oval Ring gaskets are solid brass sealing rings manufactured for use with Ring Type Joint (RTJ) flanges in general industrial, water, gas, and utility service applications. Both profiles are precision-machined from solid brass bar to the dimensional tolerances required for reliable RTJ groove seating — the brass ring seats into the trapezoidal groove of the RTJ flange and creates a metal-to-metal seal through controlled plastic deformation of the brass ring under bolt loading.
Brass oval and octagonal rings are widely used as cost-effective, corrosion-resistant alternatives to carbon steel RTJ rings in non-aggressive general service environments. They are also commonly supplied as direct replacement rings in legacy RTJ flange systems originally designed and installed with soft metal ring gaskets. Naval Brass rings are available for marine-adjacent and brackish water service.
Brass Kammprofile gaskets feature a solid brass metal core with precision-machined concentric serrated grooves on both faces, covered with a bonded soft overlay of PTFE or flexible graphite. The serrated groove profile concentrates bolt load onto multiple narrow sealing lines — while the soft PTFE or graphite overlay fills surface imperfections and provides a resilient sealing interface between the brass core and the flange face.
The machinability of brass makes it an excellent material for Kammprofile core production — the precise concentric serration profile can be machined into brass accurately and efficiently, producing consistent groove geometry and uniform sealing performance. The reusability advantage of the Kammprofile design — the solid brass core can be re-overlaid and reinstalled at maintenance — provides a meaningful long-term cost saving in general industrial and HVAC applications.
Match your flange configuration, operating pressure, and application requirements to the right brass gasket form:
| Gasket Type | Pressure Class | Temp Range | Flange Face Type | Reusable | Best Application |
|---|---|---|---|---|---|
| Ring Type Joint (RTJ) | Class 150–600 | Up to 250°C | RTJ Groove | No | Water, gas, general utility RTJ flanges |
| Spiral Wound | Class 150–900 | Up to 300°C | RF, FF, T&G | No | General process piping, HVAC, water treatment |
| Corrugated Metal | Class 150–600 | Up to 250°C | RF, FF | No | Low bolt load flanges, HVAC equipment |
| Metal Jacketed | Class 150–600 | Up to 300°C | FF, RF, MF, T&G | No | Large flanges, HVAC, general utility |
| Solid Metal | Class 150–600 | Up to 250°C | All types | No | General process, instruments, valve sealing |
| Lens Ring | Medium-high pressure | Up to 250°C | Conical seat | No | Instrumentation, hydraulic fittings |
| Octagonal / Oval Ring | Class 150–600 | Up to 250°C | RTJ Groove | No | Legacy RTJ replacement, general service |
| Kammprofile | Class 150–900 | Up to 300°C | RF, FF, MF, T&G | Yes (core) | General process, HVAC, reusable applications |
Good Corrosion Resistance in Water & Atmosphere: Brass offers reliable corrosion resistance in freshwater, potable water, compressed air, and atmospheric environments — making it suitable for water supply systems, building services, plumbing installations, HVAC circuits, and general outdoor or sheltered industrial applications. The natural copper content of the alloy contributes antimicrobial properties particularly valued in potable water and food-adjacent applications.
Excellent Machinability: Brass is one of the most machinable of all engineering metals — its free-cutting characteristics allow precision gasket forms such as lens rings, solid machined rings, and instrument connection seals to be produced to tight dimensional tolerances and fine surface finishes efficiently and at lower manufacturing cost than harder metallic alternatives.
Natural Ductility & Conformability: Brass possesses good natural ductility — allowing flat ring and solid gasket forms to cold-flow under bolt compression and conform to minor flange surface irregularities, producing a reliable seal even where the flange surface finish is not ideal. This conformability makes brass gaskets tolerant of aged or moderately worn flange surfaces — a practical advantage in maintenance and replacement applications.
Cost-Effectiveness: Across all gasket types and sizes, brass gaskets offer a more economical sealing solution than stainless steel, copper, or higher-alloy alternatives for general industrial, plumbing, and HVAC applications where the operating conditions are within the brass service range.
Broad Fluid Compatibility: Brass gaskets are compatible with freshwater, potable water, hot and cold water, compressed air, natural gas, LPG, lubricating oil, hydraulic oil, and a wide range of mild industrial and process fluids — making them a genuinely versatile sealing solution for non-aggressive general industrial service applications.
Dezincification Resistance (Naval Brass Grade): For applications in marine-adjacent, brackish water, or aggressive water chemistry environments, Naval Brass (CuZn30Sn1) provides significantly improved resistance to dezincification while retaining the general engineering properties of standard brass.
