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Electromagnetic Interference (EMI)/Radio Frequency Interference (RMI) Shielding Products

Engineers designing electronic instruments many times must manage electromagnetic interference (EMI) that may cause an undesirable response, malfunctioning or degradation in the performance of electrical equipment. Electromagnetic interference (EMI) shielding is the process of blocking the induction of electromagnetic radiation, which is emitted by electrical circuits carrying rapidly changing signals, as a by-product of their normal operation to other circuits which causes unwanted signals (interference or noise). This is achieved by separating the circuits with a barrier made of conductive material. One of the best ways to protect from unwanted emissions is to contain the noise within an enclosure. The enclosure lid needs to make good contact with the enclosure itself to create a complete conductive path.

 

J.J. Short Associates, Inc. has several materials available to be custom molded or die cut into EMI shielding shapes and gaskets. As with our other product lines, J.J. Short Associates, Inc. offers custom designed, EMI-Shielded O-rings, seals gaskets and molded sheet stock for a variety of electronic applications from prototype to production, in small lots or long runs. Our EMI shielded O-rings and seals provide moisture/pressure sealing and EMI/EMP shielding when compressed in a properly designed groove. They are interchangeable with standard non-conductive seals of the same dimensions or designed to meet your exact specifications and dimensions.

J.J. Short Associates, Inc. offers conductive O-rings and seals utilizing commercial grade and military grade shielding elastomers and can produce EMI-Shielded seals and gaskets in an unlimited variety of shapes and sizes.

There are many types of EMI shielding materials and solutions available to the engineer. Conductive elastomers are an extension of our rubber capabilities. We can provide EMI parts and gaskets that are compression molded, die cut, or water jet cut from electrically conductive silicone rubber compounds. The main advantage of EMI shielding gaskets, seals and parts fabricated from conductive elastomers is the combined benefit of environmental sealing over a broad temperature range and EMI shielding. This conductive material is typically silicone rubber or fluorosilicone rubber with embedded silver plated aluminum particles, silver plated glass beads, silver plated copper particles, nickel-graphite particles or conductive carbon.

Many of our line of conductive silicone elastomers are designed around the Mil-DTL-83528C Specification.

A partial listing of our compounds include:

Custom Conductive Elastomers Mil-G-83528 Qualified and Commercial Materials

Type A = Silver (Ag) coated Copper (Cu) in Silicone 65 Shore A
Type B = Silver (Ag) coated Aluminum (Al) in Silicone 65 Shore A
Type C = Silver (Ag) coated Copper (Cu) in Fluorosilicone 75 Shore A
Type D = Silver (Ag) coated Aluminum (Al) in Fluorosilicone 70 Shore A
Type E = Silver (Ag) in Silicone 65 Shore A
Type F = Silver (Ag) in Fluorosilicone 75 Shore A
Type G = Silver (Ag) coated Copper (Cu) in Silicone 80 Shore A
Type H = Silver (Ag) in Silicone 80 Shore A
Type J = Silver (Ag) in Silicone 45 Shore A
Type K = Silver (Ag) coated Copper (Cu) in Silicone 85 Shore A
Type L = Silver (Ag) coated Nickel (Ni) in Silicone 75 Shore A
Type M = Silver (Ag) coated Glass in Silicone 65 Shore A
Nickel and Nickel coated Graphite (30 Shore A to 75 Shore A) in Silicone

Our conductive materials are used to produce shielding gaskets, seals, condiuctive o-rings, sheets and molded shapes for Military, Aerospace, electronics, and communications applications. Our range of conductive elastomers has expanded to include materials that are designed to balance requirements for electrical conductivity and cost performance for the commercial sector.

Some Common Questions Regarding Qualifying EMI/RFI Shielding Material

  1. What is the max ohms/cm in terms of volume resistivity do you need to achieve?
  2. What is the max ohms/cm in terms of surface resistivity you need to achieve?
  3. What environment will this material be exposed to? Or does this need to be a solvent resistant or fluorosilcione?
  4. Does this material need to meet the Mil-Dtl-83528C QPL spec? If yes what type or call out? (the specs go from type A to type M)
  5. Are you looking for a semi conductive or static dissipating material or is this a true EMI/RFI shielding application?
  6. What thickness do you need and at what thickness specification in terms of +/-

Contact us with your sketches, drawings and specifications and we will see if we can help!

If itís made from rubber, contact us!