Which gasket material

These materials meet all the requirements for EMI applications, but are useful when a small and precise gasket is required. EMI materials have the ability to shield between the two sides of the gasket and are very commonly seen in applications across a wide spectrum including test equipment, communications, satellites, and aerospace.

Designers no longer need to choose between an environmental seal or EMI shielding gasket. Silicone extrusions merge both types of gaskets into a single product. This category of material features a thin electrically conductive shield co-extruded on a high performance silicone rubber base. Silicone extrusions are typically selected when you have a groove you want to put a gasket into. If the groove is too small for an extrusion, FIP dispensing is likely the only option.

In addition, extrusion provides a lower compression force, as it is a softer material than that used in FIP dispensing. Typically, silicone products made for EMI shielding are made conductive by putting a conductive filler in the material, often silver, aluminum, copper, or nickel. This type of material is highly flexible and can be made to fit a wide variety of sizes and designs. As such, it is typically used primarily on print circuit boards PCB or as connector gaskets on ports in electronics.

Conductive fluorosilicone materials use a fluorinated silicone elastomer base instead, to prevent degrading with contact to the above-mentioned chemicals or environmental factors. Fluorosilicone products are also made conductive by putting a conductive filler in the material, often silver, aluminum, copper, or nickel. Gaskets made with fluorosilicone have a strong resistance to the hydrocarbons found in many of the harsher environmental conditions. Like silicone above, this material is commonly used in PCB applications, and is selected when a more chemically resistant material is required.

If you are concerned that the gasket material will come into contact with acetones or detergents that may erode the material, fluorosilicone is the right fit.

As such, it is also typically more expensive than silicone. This material is best fit in areas where very low compression forces are required. It is most commonly used for servers and in cabinets where electronics are slotted in layers on top of each other. It is generally less expensive than other EMI materials.

Dense rubber and foam based absorbers that are resistant to UV, ozone, extreme temperatures and flame. Typically these materials are thin, magnetically loaded sheet stock, having high loss at microwave frequencies, while maintaining the desirable characteristics of elastomeric binders. These materials are designed to help lower Q Factor in cavities and attenuate cavity oscillations. Thermal interface materials are used to dissipate heat in a part. The type of material you need will be based on the amount of power being output over a specific timeframe.

From there you can select the right conductivity of the material to dissipate the required heat. This group of materials is typically used for custom gasket production for chips or PCB applications.

Silicone is generally selected when there is a large gap here. The idea is that the gasket will transfer the heat to your aluminum metal housing which will then dissipate the heat.

This class of materials offers the same benefits as Silicone gap fillers above, but has added properties that prevent outgassing.

These acrylic pads have no siloxane VOC or oil bleeding, which are associated with silicone products and can often cause device failure. Silicone outgassing can cause contamination which may be a problem, particularly for hard drives in electronic applications. The pads offer the ability to fit into much smaller gaps, but offer the same material benefits.

Thermal tapes are best fit when you need to create a structural bond with your custom gasket. If you have two sides of a part that need to be stuck together and you want to dissipate heat, thermal tape is the way to go. These materials are commonly used to bond a heatsink to circuit boards and in electronic commodity production. Unlike pre-formed gap filling materials, Thermal Pastes offer infinite thickness options and eliminate the need for specific pad thicknesses or die-cut shapes for individual applications.

Thermal pastes can be used in the place of gap fillers when very low compression forces are required. They will create virtually zero stress on components during the assembly process. There is definitely a give and take with this class of materials as they are very messy. Your application must be able to tolerate this, and you have to be ready to immediately assemble the rest of the part before the paste dries. Most of the materials listed above are available with or without a pressure-sensitive adhesive PSA backing, depending on the needs of the customers.

While the addition of a PSA backing reduces the amount of time and labor required for the installation of a gasket, it is not recommended for the following applications:. When choosing a gasket material, there are several factors to keep in mind to ensure the one chosen is appropriate for the intended application.

Some of the key considerations are:. Custom Gasket Manufacturing specializes in providing custom gaskets, seals, and other rubber products. Our manufacturing capabilities include die-cutting, specialty cutting i. Whether a customer needs a custom gasket or other product, our team provides a high-quality solution on time and in budget. To find out more about our custom gaskets and other product solutions, contact us today. For pricing details, request a quote. Call or email your inquiry to sales customgasketmfg.

A Guide to Gasket Material Selection Gaskets are mechanical seals used in fluid processing and handling equipment to prevent process fluids from escaping and contaminants from entering sensitive areas. Rubber Rubber comes in several formulations and grades , making it ideal for a wide range of applications with varying environmental and operating conditions.

Rubber Molding Compounds Rubber molding compounds are utilized in molding operations—e. Closed-Cell Sponge Rubber Closed-cell sponge rubber features cells that are fully separated from surrounding cells to prevent the intrusion of fluids.

Open-Cell Sponge Rubber Open-cell sponge rubber features interconnected cells that allow gases, liquids, and other media to pass through the material. Compressed Non-Asbestos Compressed non-asbestos materials consist of non-asbestos fibers e. Cork Cork demonstrates high compressibility and flexibility. Electrical Insulation Electrical insulation refers to materials used in electrical applications for their lack of electrical conductivity.

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