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Waveguide Gasket and O-Ring

Waveguide gaskets and O-rings are essential components for ensuring airtight and moisture-resistant seals in waveguide assemblies. These sealing solutions are critical for maintaining the integrity and performance of microwave and RF systems, preventing leakage and ensuring reliable signal transmission in various environmental conditions.

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Waveguide sealing components

Waveguide Gasket and O‑Ring

Silicone gaskets and O‑rings for sealing waveguide flange joints. The published range includes conductive and non‑conductive options for PAR, PBR and CPR/PDR style interfaces, with listed models from WR650 down to WR28. Custom D‑type and O‑type dimensions can also be quoted against your flange drawing.

Check model dimensions What to send for a quote
WR650–WR28 models shown in the table D‑type & O‑type sealing forms Conductive / non‑conductive silicone options
Non-conductive rectangular D-type waveguide gaskets and O-rings
D‑type rectangular gaskets and O‑rings shown in Dolph Microwave’s gasket selection reference.

Start with the sealing job

Pressure seal only, or pressure and RF seal?

This is the first choice to make before matching a model. Then confirm the waveguide size, flange designation and the groove or sealing face that the gasket has to fit.

Pressure seal only

Non‑conductive gasket

The published selection guidance calls for a non‑conductive gasket when the joint only needs a pressure seal. Silicone or neoprene O‑rings and rectangular seals are used to fit the matching flange groove.

Pressure + RF seal

Conductive gasket

For a joint that also needs an electrical contact path, the published guidance points to conductive gasket material. Conductive elastomers may use metallic filler; the required material should be confirmed with the quoted configuration.

Do not select by WR size alone. The same waveguide size can use different flange faces and sealing arrangements. Send the complete flange designation or a dimensioned drawing when it is available. No pressure rating, insertion loss or shielding value should be assumed from the gasket type alone unless it is stated on the approved drawing or test requirement.

Product details in pictures

See the seal styles before you match the flange.

The photos below show the main forms discussed in the product and selection guidance. They are useful for identification, but the final size still comes from the model data or approved drawing.

Rectangular D-type and O-ring waveguide seals
D‑type and O‑ring forms. Groove-fitting shapes used with the corresponding waveguide flange geometry.
Conductive waveguide O-rings in several sizes

Conductive O‑rings

Shown in several sizes. Match the ring cross-section and inside diameter to the approved flange groove.

Conductive flat waveguide gaskets

Flat gasket is a different style

For a flange-face gasket rather than a groove-fitting O‑ring or D‑type seal, review the separate die‑cut gasket product.

View Waveguide Gasket, Die Cut

Published product overview

What is listed on the current product page

The summary below keeps the original specification fields. The model table further down retains every published row and dimensional entry.

17 modelsRows in the current product table
WR650–WR28Waveguide sizes shown by the model table
PAR / PBRPublished O‑ring flange references
CPR / PDRPublished full or half gasket references
Flange Type
MFO, MFD, MFOA (FBM/FBE, FDM, FAM/FAE)
Waveguide Sizes
WR650 to WR62 (custom sizes available)
Material
Conductive silicone rubber, Ordinary silicone rubber
Flange Compatibility
UG and CPR style flanges
Customization
Dimensions customizable per client requirements

Range note: the overview text says WR650 to WR62, while the published model table continues through WR51, WR42, WR34 and WR28. Use the model row and approved drawing when confirming the actual order.

The current page also mentions low insertion loss, reduced flange leakage, heat transfer and reduced outgassing as design objectives, but it does not publish numeric limits or test conditions for those statements. They are therefore not presented here as guaranteed performance values.

Drawing example

WR284 shows why the seal form matters.

The selection article includes separate WR284 examples for a rectangular D‑type gasket and an O‑ring. These are identification examples, not substitutes for the production drawing.

WR284 DH-32MFD D-type waveguide gasket dimensional drawing
WR284 D‑type example — DH‑32MFDThe source drawing shows 79.4 mm, 41.3 mm, 4.9 mm and 3.5 mm callouts.
WR284 waveguide O-ring dimensional drawing
WR284 O‑ring exampleThe source drawing shows an inside diameter callout of φ101 and a ring diameter callout of φ5.4.

For the live order, match the drawing to the required flange style and the corresponding row in the model table below.

Complete published model data

Model, flange and gasket dimensions

All 17 product-page rows are retained here, including blank cells, flange designations, dimensions, electrical conductivity choices, material and document links. Scroll horizontally on smaller screens.

Dolph Microwave waveguide gasket and O-ring original model chart, dimensions in millimetres
Model WG size Gasket, full O-ring type for PAR style flanges Gasket, full O-ring type for U/G, PBR style flanges Gasket, full or half for CPR/PDR style flanges Electrical conductivity Material Datasheet
PAR I.D Φ1*Φ2(mm) PBR SQ Cover Groove I.D Φ1*Φ2(mm) PDR CPRG I.D A*B*T (mm)
DH-14MFD…WR650————CPR650G174*92.2*8.5Conductive
Non-conductive		SiliconePDF · STEP
DH-18MFD…WR510————CPR510G136*72*5Conductive
Non-conductive		SiliconePDF · STEP
DH-22MFD…WR430————CPR430G117*63*5Conductive
Non-conductive		SiliconePDF · STEP
DH-26MFD…WR340————CPR340G94*51.5*5Conductive
Non-conductive		SiliconePDF · STEP
DH-32MFD…WR284PAR32φ101*φ5.4——CPR284G79.4*41.3*3.5Conductive
Non-conductive		SiliconePDF · STEP
DH-40MFD…WR229PAR40φ82*φ5.4——CPR229G63*34.5*3.5Conductive
Non-conductive		SiliconePDF · STEP
DH-48MFD…WR187PAR48φ68.5*3.5——CPR187G53.9*28.5*3.5Conductive
Non-conductive		SiliconePDF · STEP
DH-58MFD…WR159PAR58φ60*3.5——CPR159G46.7*26.5*4.9Conductive
Non-conductive		SiliconePDF · STEP
DH-70MFD…WR137PAR70φ53*φ3.5——CPR137G41.2*22.2*4.9Conductive
Non-conductive		SiliconePDF · STEP
DH-84MFO…WR112——PBR84φ40*φ2.6CPR112G34.9*19*4.9Conductive
Non-conductive		SiliconePDF · STEP
DH-100MFO…WR90——PBR100φ33*φ2.6CPR90G28.6*15.9*4.9Conductive
Non-conductive		SiliconePDF · STEP
DH-120MFO…WR75——PBR120φ28*φ2.6CPR75G23.77*14.25*2Conductive
Non-conductive		SiliconePDF · STEP
DH-140MFO…WR62——PBR140φ23.5*φ2.6CPR62G20.6*12.7*4.9Conductive
Non-conductive		SiliconePDF · STEP
DH-180MFO…WR51——PBR180φ20*φ2.4——Conductive
Non-conductive		SiliconePDF · STEP
DH-220MFO…WR42——PBR220φ15.5*φ1.8——Conductive
Non-conductive		SiliconePDF · STEP
DH-260MFO…WR34——PBR260φ14.0*φ1.8——Conductive
Non-conductive		SiliconePDF · STEP
DH-320MFO…WR28——PBR320φ10.5*φ1.8——Conductive
Non-conductive		SiliconePDF · STEP

Dimensions and symbols are kept as printed on the current product page; “—” represents a blank source-table cell and should not be read as a confirmed incompatibility. The product-family PDF remains linked in every row. The web table and PDF can differ on individual dimensions, so the approved model drawing should control production dimensions.

Part-number guide

Read the published order code.

DH‑100MFDC
  • 100Waveguide Size | WR90
  • MFDGasket Style | For Rectangular Sealing Flanges
  • MFOGasket Style | For Square Sealing Flanges
  • CElectrical Conductivity | Conductive Materials
  • NCElectrical Conductivity | Non-Conductive Materials

This example and the code meanings come from the original listing. Confirm the complete orderable suffix and final configuration on the quotation or drawing.

Applications listed by Dolph Microwave

Typical systems where these seals are used

The current product page names the following application areas. The gasket itself should still be selected from the actual flange interface and sealing requirement.

Telecommunications

Waveguide connections used in cellular and satellite communication systems.

Radar systems

Waveguide assemblies in air traffic control and maritime navigation radar systems.

Aerospace & defense

Waveguide sealing in communication and surveillance equipment.

Research & development

Laboratory and engineering setups where waveguide sections are repeatedly assembled or changed.

Industrial processing

Waveguide joints used in industrial microwave equipment and transmission runs.

Useful internal references

Check the flange and sealing method before you order.

These pages are useful when the existing part number is missing, the flange family is unclear, or you need a different gasket style.

How to choose a Waveguide Gasket and O‑Ring Selection guide covering waveguide size, flange type and pressure-only versus pressure + RF sealing. Waveguide Flange Standard EIA & IEC Use the flange reference when the mating interface is known by a standard designation rather than a gasket model. Waveguide Gasket, Die Cut Review the separate flat gasket family when the design calls for a flange-face gasket instead of a groove-fitting D‑type or O‑ring. Straight Waveguide Sections Useful when the gasket is being selected as part of a complete replacement waveguide run or new flange-to-flange section. Standard Waveguide Products Browse other standard waveguide components that may share the same interface family. Waveguide Conductive Gasket Selection Guide Additional reading on conductive gasket structure and selection. Confirm project-specific values separately before using them as acceptance criteria.

Customers also review

These are separate products. They are included here because flange type, sealing style and the adjoining waveguide hardware are often checked together during an RFQ.

Waveguide gasket die-cut product family

Waveguide Gasket, Die Cut

Flat flange-face gasket option to review when the joint does not use the same groove-fitting D‑type or O‑ring geometry.

View product →
Waveguide flange standard EIA and IEC product image

Waveguide Flange Standard EIA & IEC

Use the flange reference to identify the mating face, hole pattern and standard designation before releasing a gasket size.

View product →
Seamless flexible waveguide product family

Seamless Flexible WG

Consider a flexible section when routing, vibration or installation alignment makes a fully rigid waveguide connection unsuitable.

View product →

Technical documents

Use the PDF for reference, then confirm the exact model on the drawing.

The original product page provides the gasket specification sheet, flat gasket sheet and flange designation reference. These links are kept here so the technical files stay easy to reach.

Waveguide Gasket Specification PDF ↗ Waveguide Flat Gasket PDF ↗ Flange Designations PDF ↗
Waveguide size / existing model
Mating flange designation
Groove or sealing-face dimensions
Pressure-only or pressure + RF seal
Conductive / non-conductive material
Quantity, drawing and required documents

Dolph Microwave’s published warranty states one year from the date of delivery against defective material and workmanship, subject to the company’s warranty terms. For final supply, the quotation and approved drawing should define the exact configuration and acceptance scope.

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