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The gasket in a bolted flange connection is but one essential component in that complex mechanical device that enables low-leakage service. Nowadays so-called fugitive
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- Application / Function
- Temperature
- Internal Pressure
- Media
- UV & Ozone
- EMI / RFI Management Requirements
- Other Considerations
- Elastomers
- Plastics
- Cork
- Compressed Non-asbestos
- Foam
- Sponge
- Insulating materials
- Fibre gaskets
- Vulcanized Fiber Gaskets
- Fish Paper Gaskets (Electrical Grade)
- Felt
- Others
- Pressure Sensitive Adhesive (PSA)
- Advantages
- Disadvantages
- Clamp Load
- Flange Stiffness
- Bolts
- Installation Guidelines
Because gaskets are generally low cost and appear to be simple, the criticality of their role in a device is often overlooked. They usually don’t garner much attention until there is a problem with an application or if there are high maintenance cost to service the gasket. A gasket’s main function is to provide a robust seal of a gas or a liquid ...
This is the starting point for determining which material is optimum for the application. Temperature can alter the characteristics of the gasket such as the sealing properties, compression set and maximum allowable stress even if all of the mechanical elements of the joint are properly installed. It is important to take into consideration both i...
As a system is pressurized, the joint can deform. Gasket materials are now being rated with a P x T factor that provides for max limits of temperature and pressure combined.
The media is the fluid or gas to which the gasket will be exposed. Gas is generally harder to seal than a liquid. Once a material with an acceptable pressure/temperature range has been identified it is important to determine if it is compatible with media being sealed. Various chemicals impact the both the structural integrity and functional pro...
UV & Ozone exposure are potential causes of degradation in rubber gaskets. It is important to note that ozone does not just come from the atmosphere but can be generated in electrical enclosures that house high voltage electrical components. UV and ozone breakdown the carbon bonds in the backbone polymers. Drying, cracking, flaking, hardening an...
Manufactures of consumer, automotive, aerospace and industrial electronics are required to meet Federal EMI standards for their products. EMI (electromagnetic interference) is emitted by internal wires and components can act as emitting antennas. To control EMI radiation, electronic components are completely encased in a conductive enclosure. It ...
In certain applications such as drinking water or food environments, other mandates exist. For example, gasket materials may have to meet FDA compliance, NSF (National Sanitary Foundation), or WRAS (Water Regulations Advisory Scheme) which are approved for potable water. There are other industry standards that often have to be met. Examples in...
Elastomers are one of the most common and affordable materials used in gaskets. They have a wide range of characteristics and are generally readily available. Click on the link below to assist in narrowing the search for the optimum elastomeric material for your application.
Engineered plastics are also a very common material for gaskets. They also have a wide range of characteristics that can be found to assist in most types of applications. Click on the link below to assist in narrowing the search for the optimum plastic material for your application:
Cork is a lightweight, stable material that cannot be penetrated by water. It exhibits excellent compressibility, virtually no lateral flow and high oil resistance. It is resistant to wear and is unaffected by temperature extremes.
Compressed non-asbestos materials combine non-asbestos fibers such as fiberglass and aramid fibers with rubber to enhance the temperature and pressure performance of the gasket. Combining inorganic and organic fibers with rubber and fiberglass allows for a range of variants that have different mechanical specifications. These compressed non-asbesto...
Foam is made with a number of different components, which affect its performance. Examples include EPDM, polyester, polyurethane, PVC, silicone, melamine and others. Foam is generally measured by its density (in pounds). Foam is available in open or closed cell. This pertains to the cellular makeup of the material. Generally, open-cell foams a...
Sponge is generally made with one or more elastomers, using different manufacturing and curing procedures than with standard calendared elastomers. The composition of the elastomers used in the sponge affect its performance. Sponge is also available in open or closed-cell and generally has a more heavy duty use than foam.
There are a number of materials used for their insulating characteristics in applications where electrical shielding, insulating, or other conductive issues are present. We commonly work with Nomex, Kapton and blends of the two materials to satisfy electrical insulating requirements. Other materials used in electrical applications include Copaco,...
Fiber materials are available in a broad range of thicknesses, hardness, and colors. The materials most frequently used include:
This is a hard, durable, chemically pure cellulose product that contains no resin or bonding agents. It has superior flatness, high mechanical strength, and excellent resistance to heat and cold. It is light weight and has excellent tear resistance. Vulcanized fiber also has excellent electrical properties.
The electrical grade of vulcanized fiber is referred to as fish paper. It is exhibits excellent electrical insulating properties, is lightweight and non-magnetic. Fish paper is resistant to solvents, oils, grease, corrosion, wear and abrasion.
There are generally two categories of felt. Wool or wool blend felt and synthetic felt. Wool or pressed felt is an economical material for gaskets. It is made by compressing layers of wool fiber into a specific density and thickness using heat, moisture and pressure. Key properties of felt include high liquid absorption capacity, a low coefficie...
Please visit our full material list and contact us at any time to discuss your applications and our available materials that might fit your application.
PSA can be applied to many different materials and part configurations. PSA provides a way to cut costs and increase production rates by facilitating complex assembly processes. Proper positioning of a gasket or synthetic part during the assembly process is a common challenge. Parts with the appropriate PSA enable the gasket to be removed, adjus...
Excellent tack and adhesion Bonds well to most surfaces Achieves ultimate adhesion quickly Economically priced Good temperature resistance Good chemical, U.V. and oxidation resistance Repositionable Good elevated temperature resistance Moderate chemical and oxidation resistance Excellent U.V. resistance
Poor elevated temperature resistance Fair chemical, U.V. and oxidation resistance Difficult to reposition Low initial bond strength, but builds over time More expensive than rubber based More expensive than acrylic Reasonable adhesion
It is critical to determine the clamp load or seating pressure required to compress or seat the gasket so that it adequately compensates for the imperfections in the mating surfaces. Clamp load must be applied uniformly across the entire seating area and it must be enough to maintain the seating stress as the bolts or gasket materials relax due to...
The strength or stiffness is a function of the elastic modulus of the material. A higher elastic modulus will provide more stiffness and will generally allow the flange to more evenly distribute bolt load.
Bolts can be looked at as springs that are stretched to develop a clamp load. The more a bolt is stretched the greater the seating stress on the gasket. Bolts should be of sufficient strength to achieve proper compression of the gasket, to not only seal the joint, but to maintain the seal without exceeding the yield strength of the bolts being us...
Many joint leaks are caused by improperly installed gaskets. There are basic guidelines to be followed when installing a gasket. Be sure surface finish and flatness are satisfactory. Tighten the bolts to compress the gasket uniformly. This means going from side to side around the joint. Use a torque wrench, well-lubricated fasteners, and hardened ...
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View Rubber Cork Gaskets. + Compressible with negligible lateral flow. Temp Range. -30°C +150°C. + Resistant to fuels, oil, solvents and refrigerants. Stock Range. 0.8mm to 12mm. Excellent thermal insulation properties.
Gasket materials that are hard and thin can be fabricated to tighter dimensional tolerances than gasket materials that are soft and thick. Accordingly, 90 durometer rubber 1/32 inch thick can be cut to more precise requirements than 30 durometer rubber 1/8 inch thick.
This catalogue was created to identify gasket dimensions according to DIN EN and ASME standards. A general distinction can be made between two sealing geometries: 1.
Warning: Risk of fire/flammable materials If your appliance uses R600a as a refrigerant (this information will be provided on the label of the cooler) you should take care during transportation and installation to prevent the cooler elements from being damaged. R600a is an environmentally friendly and natural gas, but it is explosive. In the
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equipment connections involving flanges and gaskets. The document aims to provide the reader with a series of guidelines for the safe usage of sealing components, in order to ensure maximum performance of the seal under service conditions.
