EMI Waveguide Gaskets: Standard and Custom

SSP fabricates EMI waveguide gaskets from the electrically conductive silicones that we make. Many of our materials are M83528 QPL listed.

Our in-house toolroom has machinists on staff who make the molds, dies, jigs, and fixtures we use for EMI waveguide gasket fabrication.

We offer a full certificate of analysis (COA) for every batch. Parker Chomerics CHO-SEAL offsets are available, and in low minimum order quantities.

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What is an EMI Waveguide Gasket?

An EMI waveguide gasket provides shielding against electromagnetic interference (EMI) with waveguide systems that transmit high-frequency electromagnetic waves.  An EMI waveguide gasket combines environmental sealing with EMI shielding and is often used in military, aerospace, and satellite communications applications. SSP also makes EMI connector gaskets and other fabricated products.

EMI Waveguide Gasket Materials from SSP

The table below describes some of Specialty Silicone Products’ (SSP) most popular materials for EMI waveguide gaskets.

SSP Product

Base Material

Fill Material

Key Features

SSP2569-65

Silicone

Silver-Copper

MIL-DTL-83528, Type A

QPL Listed

Use instead of CHO-SEAL® 1215

SSP2573-75

Fluorosilicone

Silver-Copper

MIL-DTL-83528, Type C

QPL Listed

SSP2571-85

Silicone

Silver-Copper

MIL-DTL-83528, Type K

QPL Listed

Use instead of CHO-SEAL® 1212

SSP2368-65

Silicone

Silver-Aluminum

MIL-DTL-83528, Type B

Use instead of CHO-SEAL® 1285

SSP2486-70

Silicone

Silver-Aluminum

MIL-DTL-83528, Type D

QPL Listed

Use instead of CHO-SEAL® 1287 and 1298

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). Most of the SSP materials in the table above represent offsets to CHO-SEAL® products from Parker Chomerics.

EMI Waveguide Gasket Flanges

Specialty Silicone Products (SSP) makes EMI 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 MIL-SPEC and EIA waveguide sizes.

  • MIL-SPEC flanges are designated as UG-xxxx/U where the x’s represent a variable-length catalog number. 
  • CPR stands for Connector, Pressurizable, Rectangular and corresponds to EIA sizes. 
  • CMR stands for Connector, Miniature, Rectangular and corresponds to MIL-SPEC and EIA sizes.

 

The Electronics Industries Alliance (EIA) was a trade group that defined CPR and CMR flanges 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.  We can also mold EMI waveguide gaskets. 

Flat EMI Waveguide Gaskets

WR28

UG-599/U

M83528/013X001

M83528/013X002

WR42

EG-595/U

EG-597/U

M83528/013X003

WR62

UG-419/U

M83528/013X005

WR90

UG-1736/U

UG-1737/U

M83528/013X010

WR112

UG-1734/U

UG-1735/U

M83528/013X016

WR137

UG-1732/U

UG-1733/U

M83528/013X020

M83528/013X021

M83528/013X022

WR159

UG-1730/U

UG-1731/U

M83528/013X024

M83528/013X025

WR187

UG-1728/U

UG-1729/U

M83528/013X027

M83528/013X028

M83528/013X029

WR229

UG-1726/U

UG-1727/U

M83528/013X031

M83528/013X032

WR284

UG-53/U

UG-584/U

UG-1724/U

UG-1725/U

M83528/013X033

M83528/013X034

M83528/013X035

WR340

UG-533/U

UG-554/U

UG-435A/U

UG-437A/U

M83528/013X040

M83528/013X041

WR650

UG-417A/U

UG-418A/U

M83528/013X042

M83528 EMI Waveguide Gaskets

Die Cut Square and Rectangular (Configuration A)

Shaded area indicates optional raised lip. When included, the lip shall be a nominal of .187 (4.75 mm) wide. Thickness T1 shall be .004 (0.10 mm) ± .002 (0.05 mm). Lip is standard on configuration A dash numbers without footnote 1/ reference in table I. For dash numbers in table I with footnote 1/ reference, lip is optional.

emi waveguide gaskets

 

MIL-DTL-83528 Part NumberDimensions (Configuration A)
A
± .015 (0.38)		B
± .015 (0.38)		C
+ .015 (0.38) -.000 (0.00)		D
+ .015 (0.38) – .000 (0.00)		E
± .010 (0.25)		T
± .003 (0.08)		F Radius
± .010 (0.25)

M83528/013X001

.75019.05.75019.05.1453.68.2857.24.1162.95.027.69.46911.91

M83528/013X003

.87522.23.87522.23.1754.45.42510.80.1162.95.027.69.56314.30

M83528/013X005

1.31333.351.31333.35.63016.00.3208.13.1403.56.027.69.87522.23

M83528/013X007

1.49638.001.49638.00.76019.30.3859.78.1553.94.027.69.45011.43

M83528/013X009

1.62541.281.62541.28.90522.99.40510.29.1694.29.027.69.46911.91

M83528/013X010

1.59440.492.09453.19.40510.29.90522.99.1694.29.027.69.2506.35

M83528/013X015

1.87547.631.87547.631.13028.70.50512.83.1804.57.027.691.1529.21

M83528/013X016

1.75044.452.50063.50.50512.831.13028.70.1714.34.027.69.2506.35

M83528/013X020

1.93749.202.68768.25.63316.081.38035.05.2065.23.027.69.2506.35

M83528/013X021

1.53138.892.28157.94.63216.051.38235.10.1503.81.027.69.1253.18

M83528/013X024

2.43861.933.18880.98.80520.451.60040.64.2576.53.027.69.3137.95

M83528/013X025

1.75044.452.50063.50.80020.321.60040.64.160
.150		4.06
3.81		.027.69.1253.18

M83528/013X027

3.50088.902.50063.501.88047.75.88022.35.2666.76.027.69.3137.95

M83528/013X028

1.78445.312.78170.64.88222.401.88247.80.156
.141		3.96
3.58		.027.69.1253.18

M83528/013X031

2.75069.853.87598.431.15529.342.30058.42.2706.86.027.69.3127.92

M83528/013X032

2.00050.803.15680.161.15529.342.30058.42.1503.81.027.69.1253.18

M83528/013X034

4.500114.303.00076.202.85072.391.35034.29.2666.76.027.69.3137.95

M83528/013X035

3.84497.642.34459.542.85072.391.35034.29.172
.188		4.37
4.78		.027.69.1253.18

M83528/013X038

3.75095.255.440138.181.71043.433.41086.61.264
.250		6.71
6.35		.027.69.2506.35

M83528/013X039

3.75095.255.438138.131.71043.433.41086.61.2666.76.027.69.2506.35

M83528/013X040 

4.188106.386.344161.142.16054.864.310109.47.266
.281		6.76
7.14		.027.69.2506.35

M83528/013X041

6.344161.144.188106.384.310109.472.16054.86.2666.76.027.69.2506.35

M83528/013X042

5.438138.138.688220.683.26082.806.510165.35.250
.328		6.35
8.33		.027.69.2506.35

Die Cut Circular (Configuration B)

Shaded area indicates optional raised lip. When included, the lip shall be a nominal of .187 (4.75 mm) wide. Thickness T1 shall be .004 (0.10 mm) ± .002 (0.05 mm). Lip is standard on configuration B dash numbers without footnote 1/ reference in table I. For dash numbers in table I with footnote 1/ reference, lip is optional.

emi waveguide gaskets

 

MIL-DTL-83528
Part Number

Dimensions (Configuration B)

A
± .015 (0.38)

B
± .015 (0.38) -.000 (.00)

C
± .015 (0.38) -.000 (.00)

D
± .010 (.25)

T
± .005 (.13)

M83528/013X019

3.125

79.38

.632

16.05

1.382

35.10

.234

5.94

.027

.69

M83528/013X026

3.625

92.08

.882

22.40

1.882

47.80

.234

5.94

.027

.69

M83528/013X033

5.312

134.92

1.350

34.29

2.850

72.39

.290

7.37

.027

.69

Molded Rectangular with O-Shaped Cross Section (Configuration C)

M83528 rectangular EMI waveguide gaskets with an O-shaped section gaskets come in five sizes. They’re ideal for use with rectangular connectors.  These EMI gaskets can be molded out of standard compounds and used with or without a groove. Additional sizes available.

emi waveguide gaskets

 

MIL-DTL-83528 Part NumberDimensions (Configuration C)
ABT

M83528/013X013

1.368
± .012		34.75
.03		.86822.05
.25		.103
±.003		2.62
.08

M83528/013X018

1.616
± .015		41.05
.38		.99125.17
.25		.103
±.003		2.62
.08

M83528/013X023

1.866
± .015		41.05
.38		1.11628.35
.30		.103
±.003		2.62
.08

M83528/013X030

2.449
± .020		62.20
.51		1.44936.80
.33		.139
±.004		3.53
.10

M83528/013X037

3.451
± .024		87.66
.61		1.95149.56
.46		.139
±.004		3.53
.10

Molded Circular with O-Shaped Cross Section (Configuration D)

Note: Molding flash of .003 (0.08 mm) in width (maximum) and .005 (0.13 mm) in thickness (maximum) is allowed.

emi waveguide gaskets

Molded Circular with D-Shaped Cross Section (Configuration E)

NOTE: Molding flash of .003 (0.08 mm) in width (maximum) and .005 (0.13 mm) in thickness (maximum) is allowed.

emi waveguide gaskets

EMI Waveguide Gasket Examples

The images below are examples of EMI waveguide gaskets that SSP has fabricated from the electrically conductive shielding elastomers that we make.

Rectangular Waveguide - Fixture
Rectangular Waveguide - White Background
Rectangular Waveguide - Wood Background