Rubber Flange Gaskets

Rubber flange gaskets are used to seal bolted flange connections in industrial piping systems, water treatment facilities, pumps, valves and related equipment. Made from compressible elastomeric materials, they help form a seal between mating flange surfaces when the joint is properly assembled and tightened.

They are commonly supplied in full-face and ring-type designs, with material and dimensions selected according to the flange configuration and operating conditions.

Types of Rubber Flange Gaskets

Full Face Rubber Gaskets

Full-face gaskets cover the flange face and include bolt holes that match the flange drilling pattern. They are commonly used with flat-face flanges, including many water piping and non-metallic flange connections.

The gasket's outside diameter, bolt circle and bolt-hole arrangement must match the applicable flange standard.

Ring Type Rubber Gaskets

Ring-type gaskets fit inside the flange bolt circle and do not have bolt holes. They are commonly used with suitable raised-face flange connections and other joint designs that provide the required gasket seating surface.

The gasket's inside diameter, outside diameter and thickness must be selected for the specific flange arrangement.

Rubber Material Options

Different rubber compounds are used depending on the fluid, temperature and service environment.

EPDM Rubber

Commonly used in water systems and certain aqueous chemical applications. EPDM is also known for its resistance to weathering and ozone. It is generally not suitable for petroleum oils and hydrocarbon fuels.

NBR Rubber

Frequently selected for applications involving petroleum-based oils, fuels and certain hydraulic fluids. Its suitability depends on the fluid composition, temperature and rubber formulation.

Neoprene (CR) Rubber

Used in selected industrial sealing applications where a balance of weathering resistance and compatibility with certain oils or chemicals is required.

FKM Rubber

Available for applications requiring resistance to many oils, fuels and chemicals at elevated temperatures. Compatibility must be checked for the specific medium, as FKM is not suitable for every chemical.

Flange Standards & Dimensions

Rubber flange gaskets can be produced according to commonly used flange dimensions, including ASME, EN, DIN and JIS systems.

Flange standard, nominal size and pressure designation are important when identifying the required gasket dimensions. However, the flange pressure rating does not automatically establish the allowable operating pressure of the gasket material.

For non-standard connections, gasket dimensions can be specified using drawings or samples.

Industrial Applications

Typical applications include:

• Water supply and wastewater treatment piping

• Pump and valve flange connections

• Industrial utility pipelines

• HVAC and cooling water systems

• Selected chemical processing lines

• Equipment maintenance and flange gasket replacement

Custom Gaskets & Bulk Supply

CORA SEALS supplies rubber flange gasket options for industrial distributors, maintenance contractors, piping suppliers and equipment manufacturers.

Standard flange patterns and custom-cut gaskets can be reviewed according to drawings, material specifications and order quantities.

Request a Quote

Please provide the flange standard, nominal size, gasket type, rubber material, thickness and required quantity. For custom gaskets, drawings or samples are helpful. If the material is not specified, include the operating medium and temperature so the requirements can be reviewed before quotation.