Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
This flange rubber gasket is designed for static sealing in pipe, valve, pump and equipment flange connections. Full-face, ring-type, raised-face ring and custom profiles are available from DN15 to DN600, with larger sizes upon request. Materials include EPDM, NBR, HNBR, FKM, Silicone, CR and application-specific compounds.
A flange rubber gasket is a static elastomer seal installed between two bolted flange faces. It helps control leakage of water, oil, gas, steam or application-specific chemical media in pipework, pumps, valves and industrial equipment. Full-face, ring-type and custom-shaped gaskets are available in EPDM, NBR, HNBR, FKM, Silicone, CR and other compounds.
Product Overview
The flange rubber gasket creates a compressible sealing interface between compatible pipe or equipment flanges. When the bolts are tightened, the elastomer deforms within a controlled range and helps fill minor surface irregularities around the flow passage. Full-face gaskets extend across the flange contact surface and include bolt holes. Ring-type gaskets seal inside the bolt circle and concentrate the clamping load around the bore. Custom profiles can be manufactured for non-standard housings, pumps, covers and machinery interfaces. Common size requirements range from DN15 (1/2 inch) to DN600 (24 inches). Final selection depends on the flange standard, pressure class, contact media, temperature and bolt-loading conditions.
Key Features
- Static rubber gasket for compatible pipe, pump, valve, tank and equipment flanges.
- Available as full-face, ring-type, raised-face ring and custom-shaped gasket profiles.
- Standard size requirements from DN15 (1/2 inch) to DN600 (24 inches); larger sizes can be reviewed.
- Standard thickness options include 1.5 mm, 2.0 mm, 3.0 mm, 4.5 mm and 6.0 mm.
- EPDM, NBR, HNBR, FKM, Silicone, CR, NR, IIR and SBR compounds are available according to the application.
- Die-cut, water-jet-cut and compression-molded structures can be evaluated according to the geometry and quantity.
- Dimensional requirements for ASME, EN, DIN, BS and project-specific JIS flange interfaces can be reviewed.
- Custom dimensions, Shore A hardness, inspection documents and packaging options are available upon request.
Size / Dimensions
| Dimension Item | Specification |
|---|---|
| Nominal Size Range | DN15 (1/2 inch) to DN600 (24 inches); larger sizes available upon request |
| Outer Diameter (OD) | Available according to flange standard or drawing |
| Inner Diameter (ID) | Available according to flange standard or drawing |
| Outer Length | Available upon request for rectangular or custom-shaped gaskets |
| Outer Width | Available upon request for rectangular or custom-shaped gaskets |
| Standard Thickness Options | 1.5 mm, 2.0 mm, 3.0 mm, 4.5 mm and 6.0 mm |
| Custom Thickness | Available upon request |
| Bolt Hole Quantity | Available according to flange design |
| Bolt Hole Diameter | Available according to drawing |
| Bolt Circle Diameter (PCD) | Available according to flange standard or drawing |
| Bolt Hole Center-to-Center Distance | Available according to drawing |
| Cross-Section | Available according to drawing or physical sample |
Product Specifications
| Specification | Details |
|---|---|
| Product Name | Flange Rubber Gasket |
| Also Known As | Pipe flange gasket, flange ring seal, flat ring gasket, full-face flange gasket or pipe flange seal |
| Material | EPDM, NBR, HNBR, FKM, VMQ Silicone, CR, NR, IIR, SBR or application-specific rubber compound |
| Hardness | 40–80 Shore A, depending on the compound and application conditions |
| Color | Black or custom color, depending on the selected compound |
| Manufacturing Process | Die cutting, water-jet cutting or compression molding, depending on the material, thickness, geometry and quantity |
| Gasket Types | Full-face gasket, ring-type gasket, raised-face ring gasket, reducing gasket or custom-shaped flange seal |
| Pressure-Class Review | PN6, PN10, PN16, PN25, PN40 and ASME Class 150 or Class 300 requirements can be evaluated. Final suitability depends on the gasket compound, thickness, flange design, bolt load, temperature and contact media. |
| Flange Interface References | ASME B16.21, EN 1514-1, DIN 2690, BS 4865 and project-specific JIS flange dimensions can be reviewed according to buyer requirements. |
| Application | Static sealing between compatible pipe, valve, pump, tank and industrial-equipment flange faces |
| Customization | Outer diameter, inner diameter, length, width, thickness, bolt-hole quantity, hole diameter, PCD, cross-section, rubber material, Shore A hardness, dimensional tolerance, packaging and inspection requirements can be reviewed according to the drawing and application conditions. |
| MOQ | Contact us for details |
| Tooling | Tooling cost depends on the drawing and product structure |
| Sample Availability | Available upon request |
| Lead Time | Available upon request |
| Compliance Options | RoHS, REACH, FDA, WRAS and ACS options can be reviewed for applicable compounds. Documentation is available upon request. |
Flange Gasket Type Selection Guide
| Gasket Type | Structure | Recommended Use |
|---|---|---|
| Full-Face Gasket (FF) | Covers the complete flange contact surface and includes bolt holes | Flat-face flanges, cast-iron flanges, plastic flanges, HVAC piping and low-to-medium-pressure water systems |
| Ring-Type Gasket / Inside Bolt Circle (IBC) | Fits inside the bolt circle and seals around the central bore | Industrial piping where the clamping load should be concentrated on a smaller sealing area |
| Raised-Face Ring Gasket | Annular gasket sized to the raised-face seating area | Raised-face steel flanges in process piping, water treatment and industrial fluid systems |
| Reducing Gasket | Application-specific bore geometry for transition connections | Reducer flanges and non-standard pipe transitions |
| Custom Profile Gasket | Rectangular, oval, multi-hole, stepped or molded geometry | Pump housings, heat exchangers, covers, tanks and OEM equipment interfaces |
Material Selection Guide
| Rubber Material | Typical Temperature Range | Key Characteristics | Recommended Applications |
|---|---|---|---|
| EPDM | -50°C to +150°C | Water, hot-water, weather, ozone and outdoor resistance | Municipal water systems, HVAC piping, cooling circuits, outdoor installations and selected steam-service requirements |
| NBR | -40°C to +100°C | Resistance to petroleum-based oils, mineral oils and hydraulic fluids | Oil-handling systems, hydraulic lines, lubrication systems and industrial machinery |
| HNBR | -40°C to +150°C | Improved thermal stability, tensile strength and resistance to hot oil exposure | Elevated-temperature oil service, heavy-duty machinery and specialized petrochemical applications |
| FKM | -20°C to +200°C | Heat resistance and compatibility with demanding oils, fuels and chemical media | Chemical processing, oil and gas equipment, high-temperature industrial piping and demanding fluid systems |
| VMQ Silicone | -60°C to +250°C | Broad temperature capability and flexible compression behavior | Food-processing, pharmaceutical, temperature-sensitive and application-specific hygienic sealing requirements |
| CR (Chloroprene) | -40°C to +120°C | Balanced weather resistance, moderate oil resistance and mechanical durability | Marine, outdoor and general-purpose industrial flange connections |
| IIR (Butyl Rubber) | -40°C to +130°C | Low gas permeability and suitability for selected gas or vacuum applications | Gas-sealing, vacuum and application-specific steam-service requirements |
Temperature ranges are compound-dependent reference values. Final material selection should be confirmed according to the contact media, continuous temperature, peak temperature, pressure class and validation requirements.
Thickness Selection Guide
| Gasket Thickness | Typical Selection Considerations |
|---|---|
| 1.5 mm | Smaller flanges and machined mating faces requiring controlled compression |
| 2.0 mm | General-purpose water, HVAC and industrial sealing applications |
| 3.0 mm | Common industrial applications requiring moderate surface-conformance capability |
| 4.5 mm | Cast-iron flanges and older equipment with less uniform flange surfaces |
| 6.0 mm | Applications requiring additional conformability, vibration damping or compensation for rougher mating surfaces |
The gasket thickness should not be selected from flange roughness alone. Bolt load, pressure, flange rigidity, sealing-face condition and rubber compression behavior must also be reviewed before confirming the specification.
Applications
Flange rubber gaskets are used in municipal water infrastructure, HVAC systems, industrial piping, pumps, valves, tanks, chemical-processing equipment, food-processing lines, marine systems and general machinery. EPDM gaskets can be reviewed for water, outdoor and HVAC applications. NBR and HNBR are suitable for oil-containing media. FKM can be evaluated for higher temperatures and demanding chemical exposure. Silicone options can be reviewed for food-processing, pharmaceutical and temperature-sensitive requirements. The final gasket type, thickness and compound should match the flange standard, nominal pipe size, pressure class, mating-surface condition, bolt-loading method and contact media.
Customization Options
Custom flange rubber gaskets can be developed according to 2D drawings, dimensional sketches, flange standards, 3D models or physical samples. Buyers can specify the flange type, nominal pipe size, pressure class, OD, ID, thickness, bolt-hole quantity, hole diameter, PCD, center-to-center spacing, compound, Shore A hardness and dimensional tolerance. Non-standard rectangular, oval, multi-hole and stepped profiles can also be evaluated. Please provide the operating media, continuous and peak temperature, required quantity, estimated annual volume, inspection requirements and packaging method. Tooling cost depends on the gasket geometry and selected manufacturing process.
Buyer Selection Checklist
- Flange standard or technical drawing
- Nominal bore size: DN or NPS
- Pressure class: PN or ASME Class
- Gasket type: full-face, ring-type, raised-face ring or custom profile
- Outer diameter and inner diameter
- Thickness
- Bolt-hole quantity, diameter and PCD
- Contact media
- Minimum and maximum operating temperature
- Rubber compound
- Shore A hardness
- Required quantity
- Estimated annual volume
- Compliance requirements
- Packaging requirements
What Information Should Buyers Provide for a Quote?
- Product drawing, flange standard or physical sample
- Nominal pipe size
- Pressure class
- Full-face, ring-type or custom-shaped gasket requirement
- Outer diameter and inner diameter
- Gasket thickness
- Bolt-hole quantity
- Bolt-hole diameter
- Bolt-circle diameter or center-to-center spacing
- Dimensions and tolerances
- Rubber material
- Shore A hardness
- Operating temperature
- Operating pressure
- Contact media
- Application environment
- Required quantity
- Estimated annual volume
- Compliance requirements
- Packaging requirements
FAQ
What is a flange rubber gasket used for?
A flange rubber gasket is installed between two bolted flange faces to create a static sealing interface around a liquid or gas passage. The compressed elastomer helps fill minor surface irregularities and reduce leakage from the joint during operation.
What is the difference between a full-face gasket and a ring-type gasket?
A full-face gasket extends across the complete flange contact surface and includes bolt holes. A ring-type gasket seals inside the bolt circle around the central passage. The correct structure depends on the flange face, bolt arrangement, pressure class and installation requirements.
How should buyers select EPDM, NBR or FKM?
EPDM can be reviewed for water, weather and HVAC service. NBR is suitable for petroleum-based oils and hydraulic fluids. FKM can be evaluated for demanding chemicals, fuels and elevated temperatures. The final compound should be confirmed according to the complete media and operating conditions.
Can you manufacture gaskets for non-standard flange dimensions?
Yes. Custom flange rubber gaskets can be produced according to a 2D drawing, dimensional sketch or physical sample. Please provide the OD, ID, thickness, bolt-hole quantity, bolt-hole diameter and PCD. Rectangular, oval, stepped and multi-hole profiles can also be reviewed.
Can flange gaskets be supplied for PN40 or Class 300 requirements?
PN40 and ASME Class 300 requirements can be evaluated. Final suitability depends on the flange design, nominal size, rubber compound, thickness, bolt load, temperature and media exposure. Buyers should provide the complete operating conditions for technical review before confirming the gasket specification.
Are FDA, WRAS or ACS material options available?
FDA, WRAS and ACS material options can be reviewed for applicable compounds and applications. Please identify the required standard, contact media, temperature range and documentation requirements when requesting a quotation. Compliance documentation is available upon request for confirmed material grades.
Request a Custom Quote
Send your flange standard, 2D drawing, dimensional sketch or physical sample for a technical review of your flange rubber gasket. Please include the nominal pipe size, pressure class, gasket type, OD, ID, thickness, bolt-hole pattern, contact media, temperature range, required quantity and estimated annual demand.
