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Gasket Seals: Different Materials for Various Applications

As a specialized laboratory equipment supplier and provider of sealing technology, Reichelt Chemietechnik presents an extensive selection of gasket seals, also known as flange seals. These are static seals, primarily used in apparatus and pipeline construction between two flanges as sealing elements. The products available in our range are offered in various materials, including NBR (Acrylonitrile Butadiene Rubber, Perbunan®), EPDM (Ethylene Propylene Diene Rubber, Keltan®), FKM (Fluororubber, Viton®/THOMAFLUOR), PTFE (Polytetrafluoroethylene, THOMAFLON), Aramid, and Graphite.

The Structure and Standard of a Gasket Seal

These products are typically stamped as rings. In cases of complex geometries, they are often plotted or cut using a water jet, resulting in a flat surface. The dimensions of the inner and outer diameters, as well as the overall thickness, define the seal, often supplemented by nominal diameter and pressure class according to DIN 2690, 2691 (or 2692). Their dimensions are typically very flat. In the interest of standard harmonization, the former standards were consolidated in the EU standard DIN EN 1514-1. To represent different forms, the following sub-descriptions were introduced for gasket seals: former DIN 2690: now EN 1514-1 Form IBC for smooth flanges; former DIN 2691: now EN 1514-1 Form TG for flanges with a groove.

Advantages, Applications, Effects – Key Features of Gasket Seals at a Glance

Advantages

The symmetrical cross-section is advantageous. Other benefits of gasket seals include their simple and compact design, easy installation, and a wide selection of materials. Additionally, grooves are not mandatory.

Applications

They are most commonly used for sealing against liquid or gaseous media and are exclusively applied in a static or quasi-static manner. They are also used in housing and cover seals.

Operation of Gasket Seals

During installation, the seals are axially compressed. To achieve leak-free performance, the axial compressive force must be greater than the sum of all radial forces acting on it. Cross-sectional leakage, which is the leakage diffusing through the material, is minimized by selecting the right material.

Materials for Gasket Seals

NBR Gasket Seal

Products made of NBR are even used under high mechanical loads when conveying oil, mineral oils, fats, or fuels. However, it is advisable to avoid NBR seals when nitric acid, formic acid, or concentrated oxidizing media such as peracetic acid are involved. In these situations, NBR, like rubber, is not resistant, and reliable resistance is not guaranteed.

The NBR gasket seal ensures high cold flexibility and high chemical resistance to vegetable and animal oils, silicones, as well as diluted alkalis and acids at room temperature. The NBR material, suitable for your new laboratory equipment, has a Shore hardness A of 65° according to DIN 53505, with an operating temperature or temperature range of -20 °C to +100 °C.

EPDM Gasket Seal

These are used in conjunction with glycols and glycol-based brake fluids, as well as when acids and alkalis are involved, such as nitric acid, hydrochloric acid, potassium hydroxide, and sodium hydroxide. But EPDM gasket seals are not affected by polar organic solutions such as acetic acid and oxidizing media like peracetic acid.

Good aging resistance, weather resistance, heat resistance, and cold resistance are characteristics of EPDM gasket seals. The same applies to tensile strength and elongation at break. The EPDM material is black and corresponds to a Shore hardness A of 65° according to DIN 53505. Operating temperatures can range from -25 °C to +120 °C.

FPM/FKM

FKM gasket seals for flanges are also traded under the THOMAFLUOR brand. Such a seal is used in connection with motor oils, aliphatic and aromatic hydrocarbons, amines, hydraulic fluids, and essential oils. The Shore hardness A of this gasket seal is 75° according to DIN 53505. The operating temperature or the possible temperature range of the seal is between -10 °C and +200 °C. Thus, these flange seals are high-performance seals that are highly resistant. Their elongation at break is approximately 200%.

Graphite

Graphite gasket seals have a material purity of at least 98%. They have a metal insert made of chrome-nickel steel expanded metal (1.4404). The operating temperature can be defined between -240 °C and +550 °C, making these products suitable for extreme applications. Graphite sealing elements comply with the TA Luft as well as the DVGW.

PTFE

PTFE gasket seals are high-temperature seals and universally applicable, although the pressure and temperature parameters should be considered depending on the application. PTFE is manufactured with a Shore hardness D of 55° according to DIN 53505. The available temperature range is specified as -200 °C to +260 °C. The purest PTFE is used for the production of these products. It is a selected high-tech material manufactured under the strictest safety standards.

Teflon Gasket Seal: A Quick Note

The trademark Teflon® is registered as a trade name for the PTFE material by DuPont. DuPont allows the use of the Teflon® trademark only to companies that can provide clear evidence of using original Teflon® granules from DuPont for the production of semi-finished products such as hoses, sheets, bars, films, and more. The flange seals made of PTFE in our product range are not referred to as "Teflon gaskets" by Reichelt Chemietechnik. RCT uses the THOMAFLON brand to represent the similar fluoropolymer group.

Buy Gasket Seals at rct-online.de

RCT offers a wide selection of sealing elements for universal applications. Discover gasket seals or flange seals in various materials, as well as many other seals, including O-rings and clamp seals. Many items are continuously in stock, ensuring short delivery times. We offer just-in-time shipping, all at fair delivery price conditions. Your order at rct-online.de is always a good choice.

If you want to find out which materials are suitable for your specific sealing needs, consult our glossary or send us an email. Our resistance list provides further information on each product, from rubber to silicone to stainless steel. Of course, our sealing technology specialists are also available on our website to assist with any questions.

Gasket Seals: Different Materials for Various Applications As a specialized laboratory equipment supplier and provider of sealing technology, Reichelt Chemietechnik presents an extensive... read more »
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Gasket Seals: Different Materials for Various Applications

As a specialized laboratory equipment supplier and provider of sealing technology, Reichelt Chemietechnik presents an extensive selection of gasket seals, also known as flange seals. These are static seals, primarily used in apparatus and pipeline construction between two flanges as sealing elements. The products available in our range are offered in various materials, including NBR (Acrylonitrile Butadiene Rubber, Perbunan®), EPDM (Ethylene Propylene Diene Rubber, Keltan®), FKM (Fluororubber, Viton®/THOMAFLUOR), PTFE (Polytetrafluoroethylene, THOMAFLON), Aramid, and Graphite.

The Structure and Standard of a Gasket Seal

These products are typically stamped as rings. In cases of complex geometries, they are often plotted or cut using a water jet, resulting in a flat surface. The dimensions of the inner and outer diameters, as well as the overall thickness, define the seal, often supplemented by nominal diameter and pressure class according to DIN 2690, 2691 (or 2692). Their dimensions are typically very flat. In the interest of standard harmonization, the former standards were consolidated in the EU standard DIN EN 1514-1. To represent different forms, the following sub-descriptions were introduced for gasket seals: former DIN 2690: now EN 1514-1 Form IBC for smooth flanges; former DIN 2691: now EN 1514-1 Form TG for flanges with a groove.

Advantages, Applications, Effects – Key Features of Gasket Seals at a Glance

Advantages

The symmetrical cross-section is advantageous. Other benefits of gasket seals include their simple and compact design, easy installation, and a wide selection of materials. Additionally, grooves are not mandatory.

Applications

They are most commonly used for sealing against liquid or gaseous media and are exclusively applied in a static or quasi-static manner. They are also used in housing and cover seals.

Operation of Gasket Seals

During installation, the seals are axially compressed. To achieve leak-free performance, the axial compressive force must be greater than the sum of all radial forces acting on it. Cross-sectional leakage, which is the leakage diffusing through the material, is minimized by selecting the right material.

Materials for Gasket Seals

NBR Gasket Seal

Products made of NBR are even used under high mechanical loads when conveying oil, mineral oils, fats, or fuels. However, it is advisable to avoid NBR seals when nitric acid, formic acid, or concentrated oxidizing media such as peracetic acid are involved. In these situations, NBR, like rubber, is not resistant, and reliable resistance is not guaranteed.

The NBR gasket seal ensures high cold flexibility and high chemical resistance to vegetable and animal oils, silicones, as well as diluted alkalis and acids at room temperature. The NBR material, suitable for your new laboratory equipment, has a Shore hardness A of 65° according to DIN 53505, with an operating temperature or temperature range of -20 °C to +100 °C.

EPDM Gasket Seal

These are used in conjunction with glycols and glycol-based brake fluids, as well as when acids and alkalis are involved, such as nitric acid, hydrochloric acid, potassium hydroxide, and sodium hydroxide. But EPDM gasket seals are not affected by polar organic solutions such as acetic acid and oxidizing media like peracetic acid.

Good aging resistance, weather resistance, heat resistance, and cold resistance are characteristics of EPDM gasket seals. The same applies to tensile strength and elongation at break. The EPDM material is black and corresponds to a Shore hardness A of 65° according to DIN 53505. Operating temperatures can range from -25 °C to +120 °C.

FPM/FKM

FKM gasket seals for flanges are also traded under the THOMAFLUOR brand. Such a seal is used in connection with motor oils, aliphatic and aromatic hydrocarbons, amines, hydraulic fluids, and essential oils. The Shore hardness A of this gasket seal is 75° according to DIN 53505. The operating temperature or the possible temperature range of the seal is between -10 °C and +200 °C. Thus, these flange seals are high-performance seals that are highly resistant. Their elongation at break is approximately 200%.

Graphite

Graphite gasket seals have a material purity of at least 98%. They have a metal insert made of chrome-nickel steel expanded metal (1.4404). The operating temperature can be defined between -240 °C and +550 °C, making these products suitable for extreme applications. Graphite sealing elements comply with the TA Luft as well as the DVGW.

PTFE

PTFE gasket seals are high-temperature seals and universally applicable, although the pressure and temperature parameters should be considered depending on the application. PTFE is manufactured with a Shore hardness D of 55° according to DIN 53505. The available temperature range is specified as -200 °C to +260 °C. The purest PTFE is used for the production of these products. It is a selected high-tech material manufactured under the strictest safety standards.

Teflon Gasket Seal: A Quick Note

The trademark Teflon® is registered as a trade name for the PTFE material by DuPont. DuPont allows the use of the Teflon® trademark only to companies that can provide clear evidence of using original Teflon® granules from DuPont for the production of semi-finished products such as hoses, sheets, bars, films, and more. The flange seals made of PTFE in our product range are not referred to as "Teflon gaskets" by Reichelt Chemietechnik. RCT uses the THOMAFLON brand to represent the similar fluoropolymer group.

Buy Gasket Seals at rct-online.de

RCT offers a wide selection of sealing elements for universal applications. Discover gasket seals or flange seals in various materials, as well as many other seals, including O-rings and clamp seals. Many items are continuously in stock, ensuring short delivery times. We offer just-in-time shipping, all at fair delivery price conditions. Your order at rct-online.de is always a good choice.

If you want to find out which materials are suitable for your specific sealing needs, consult our glossary or send us an email. Our resistance list provides further information on each product, from rubber to silicone to stainless steel. Of course, our sealing technology specialists are also available on our website to assist with any questions.