ASG offers a wide range of non-metallic sealing and insulation products, thanks to a broad network of suppliers and material manufacturers, some of which are needed for specific applications. One such product range on offer from our vast catalogue is RFI/EMI/EMC pads. Each of these material types is manufactured in various standard sheet sizes and thicknesses, however as we carry out all our conversion on-site, we can cut these down to produce plastic pads. Regardless of the size and quantity of pads required, one of many presses, bandsaws or CNC machines can be used to manufacture the final product, from one-off samples to multiple batches runs, which depending on size can be supplied as loosely cut parts or kiss-cut on rolls where a high quantity is required or for use on fast-paced assembly lines.
What are RFI/EMI/EMC Gaskets?
Gaskets are used for sealing and insulating in many industries and can take the form of complex-shaped cut parts, pads, strips or washers. Gaskets produced using RFI/EMI/EMC materials are designed to protect electronic devices from disturbances from RFI (radio frequency interference) and EMI (electromagnetic interference) and also to insulate devices ensuring they aren’t causing the interference.
Why use RFI/EMI/EMC Gaskets?
All electronic devices can generate electromagnetic or radiation interference (RFI-Radio Frequency Interference and EMI-Electromagnetic Interference), these interferences can cause disturbances within electronic devices resulting in a reduction in the effectiveness of the circuit within the device. Electromagnetic Compatibility (EMC) is the term used to measure a device’s ability to operate within its environment whilst not affecting the operation of other equipment within its surroundings.
RFI/EMI/EMC Shielding Products Available
When choosing Advanced Seals & Gaskets Ltd for your gasket needs, you are sure to be offered a number of material options, thanks to our network of material manufacturers and suppliers. Each type of RFI/EMI/EMC gasket has its own range of properties, colours, thicknesses, etc – our most popular include:
Conductive Fabric is a polyester or nylon fabric that can be nickel/copper or silver-plated to create a highly conductive material. This fabric is wrapped around a sponge and formed into usable profiles such as gaskets.
Conductive Silicone gaskets are produced using a silicone or fluorosilicone material that has been impregnated with electrically conductive particles prior to being cured. Conductive Silicone gaskets not only provide EMI/RFI shielding but will also act as a seal against dust and water.
Gap Pads can also be called filler pads, made from a silicone polymer combined with a thermal substance such as ceramic and then cured. Gap pad gaskets are used to fill uneven surfaces and air gaps which provide a thermal interface between heat sinks and electrical devices.
Knitted Mesh or knitted wire mesh is created by knitting or weaving wires such as aluminium, steel, Monel or tin-plated copper-clad steel in sections or specifically shaped gaskets. This mesh can be used on its own or as a sleeve wrapped over a sponge such as neoprene, silicone or EPDM to create a compressible gasket.
Oriented Wire is manufactured using silicone sponge and solid variants, combined with a large number of wires which are embedded vertically into the polymer. Oriented wire gaskets provide a high level of oil-resistant shielding as well as environmental protection.
Sil-Pad gaskets perform in a similar way to gap-pads but are more flexible and comfortable as the material is constructed from a variety of material combinations including fibreglass, silicone rubber, polyimide/polyester films and fillers used to enhance performance. Sil pad gaskets are used to electrically isolate the semiconductor from the heat sink.
T-flex is a soft gap-filling interface pad composed of a silicone elastomer, boron nitride filler and reinforced with fibreglass. Tflex is naturally tacky and so doesn’t require additional adhesives to be applied. Tflex is a cost-effective gap filler thermal interface material with excellent thermal performance, it is used in applications such as cooling components, storage drives, heat pipes, engine control units and telecommunications.
Tgon is manufactured in various grades and thicknesses using synthetic graphite. Tgon gaskets are generally used for thermal transfer and conductivity as opposed to electrical isolation.
Tguard is produced using a glass fibre supported silicone elastomer with ceramic oxide filler, to create a thermally conductive and electrically insulating material.
Benefits of Using RFI/EMI/EMC Gaskets
Using RFI/EMI/EMC gaskets within electronic devices creates a shield, which in turn brings a number of benefits. These gaskets fill or cover gaps between conductive paths ensuring a smooth flow of current. They also prevent electromagnetic waves internal and external from interfering with devices and circuits. RFI/EMI/EMC gaskets shielding properties also allow for a number of electrical devices to operate correctly even in the presence of each other as the Radio Frequency Interference and Electromagnetic Interference levels are controlled.