Rectangular Waveguide Gaskets for EMI Shielding

Specialty Silicone Products (SSP) makes rectangular waveguide gaskets that combine environmental sealing and insulation with shielding against electromagnetic interference (EMI). This includes EMI waveguide gaskets for UG, CPR, and CMR flanges in EIA waveguide sizes. If you’re looking for rectangular EMI waveguide gaskets for military or civilian applications, ask SSP. 

Rectangular Waveguide Gaskets for UG Flanges

Several U.S. military detail specifications describe choke, cover, and contact flanges for rectangular waveguides. These MIL-SPEC flanges are designated as UG-xxxx/U where the x’s represent a variable-length catalog number. SSP can use our CNC knife cutter to produce rectangular waveguide gaskets for UG flanges from the shielding silicones that we make.  

The table below describes some of our most popular materials for EMI waveguide gaskets.

Note that all these EMI gasket materials comply with lettered sections in MIL-DTL-83528 and are part of the M83528 Qualified Product List (QPL) from the Defense Logistics Agency (DLA). In addition, most of the SSP materials in the table above represent offsets to CHO-SEAL® products from Parker Chomerics.

Contact SSP if you’re sourcing EMI waveguide gaskets for choke flanges like UG-148C/U, cover flanges like UG-149A/U, or contact flanges like UG-1730/U that are made from CHO-SEAL® materials. Many of SSP’s EMI silicones are third-party tested, and we offer low minimum order quantities (MOQs) and a certificate of analysis (COA) with every batch.

Rectangular Waveguide Gaskets for CPR and CMR Flanges

There are two flange styles for rectangular waveguide gaskets in EIA waveguide sizes.

• CPR stands for Connector, Pressurizable, Rectangular
• CMR stands for Connector, Miniature, Rectangular

The Electronics Industries Alliance (EIA) was a trade group that defined these styles along with standard sizes for rectangular waveguides. Each EIA size starts with the letters WR (waveguide rectangular) followed by the waveguide’s broad wall dimension in hundredths of an inch rounded off. Examples of EIA waveguide sizes include WR28, WR112, and WR137.

EMI waveguide gaskets with CPR and CMR flanges begin with the letters CPR or CMR followed by the numbers (but not the letters WR) in the EIA waveguide size. For example, CMR-137 refers to an EMI waveguide gasket with a CMR flange and EIA waveguide size of WR137. SSP can produce gaskets like this for you from the materials we make and using our CNC knife cutter.   

For EMI silicones and fabricated EMI products like rectangular waveguide gaskets, contact SSP.