7900 series O-profiles

For EMI shielding applications in grooves

Several types of O-profiles have been developed for different applications, each with its own advantages. O-profiles were originally designed for high-performance shielding, mainly for military applications. They are used when environmental sealing and EMI screeningare required, and where there is not much space.

Four kinds of extrusion types are available: 1: hollow, 2: solid, 3 and 4: rectangular. These extrusion cores can be covered with metallized fabric foil or they can be made out of conductive rubber. For optimal shielding performance a compression of 5-10% is recommended for solid elastomers and 10-50% for hollow extrusions and sponge rubbers.


Compression

Solid elastomers cannot be compressed much. They are easily deformed but the volume does not change aswould be the case withsponge elastomers (PVC, EPDM, Neoprene) - see picture below, so thatallowance for material flow must be considered in the groove design.

How to use conductive o-profiels
Compression of sponge vs. solid elastomers

The figure below shows two different groove designs. On the left there is a typical rectangular groove, while the design on the right can mechanically retain circular cross-section gaskets by side friction.

The design for two different grooves
The design for two different grooves
Example image of conductive O-profiles extrusion types
Conductive O-profiles, extrusion types
Conductive O-profiles for EMI shielding applications in grooves
Conductive O-profiles for EMI shielding applications in grooves
Conductive O-profiles for EMI shielding applications in grooves
Conductive O-profiles for EMI shielding applications in grooves

Material options

7900 series Conductive O-profiles can be delivered in the following materials:

7900 series Conductive O-profiles materials

7900 series Conductive O-profiles materials

Shielding performance (dB)

Shielding effectiveness depends on the surface, the shape of gaskets and the materials used.

 Materials
 5-55-45-3X-2 *X-1 *
FrequencyGraphite
filled silicone rubber
Nickel
filled silicone rubber
Silvered
particles
filled silicone rubber
Conductive fabricAmucor
foil
200 KHz 70 75 70 65 70
100 MHz 95 110 115 103 110
500 MHz 90 110 115 92 98
2 GHz 90 105 115 89 91
10 GHz 90 100 115 87 89
These values are measured under laboratory conditions.
In other situations, results may differ; please read our Guarantee.

* Xis a placeholderfor the desired core material (1: Neoprene, 2: Silicone, 3: PVC, 4: EPDM).

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Please note: These values are measured under laboratory conditions. Results may vary in other situations; please read our Guarantee.


Technical specifications for solid silicone rubbers

 Filler
 NickelSilvered particlesGraphite (for ESD)*
Upper operating temp. °C +160 +160 +160
Lower operating temp. °C -50 -50 -50
Specific gravity (±5%) 4.60 3.20 1.99
Hardness shore A (±5%) 80 75 60
Elongation % (min) 100 100 100
Compression set % 30 30 30
Tensile strength Mpa (min) 1.25 1.25 1.00
Volume resistivity Ohms/cm (max) 0.005 0.002 0.1
These values are measured under laboratory conditions.
In other situations, results may differ; please read our Guarantee.

* Please note, the Graphite filled rubber is intended for ESD applications, not for shielding electromagnetic radiation.


Special materials (on request)

These O-profiles are also available in special materials for special applications for example applications with chemicals. Below is a list of special materials. For availability and delivery please email info@hollandshielding.com.

  • Silicone Carbon
  • Fluorosilicone Nickel Graphite
  • Silicone Nickel Graphite Flame Retardant
  • Silicone Silver Aluminium
  • Fluorosilicone Silver Aluminium
  • Fluorosilicone Nickel
  • Silver Plated Nickel
  • Silver Glass

Standardextrusions (click on the extrusion for more information)

Hollow O-profiles

Hollow extrusion
Hollow
Part numberOutside (mm)Inside (mm)
79-1-X-X-0.9/0.3 0.9 0.3
79-1-X-X-1.2/0.5 1.2 0.5
79-1-X-X-1.6/0.5 1.6 0.5
79-1-X-X-1.8/0.5 1.8 0.5
79-1-X-X-1.9/0.7 1.9 0.7
79-1-X-X-2.0/0.5 2.0 0.5
79-1-X-X-2.0/0.8 2.0 0.8
79-1-X-X-2.4/0.8 2.4 0.8
79-1-X-X-2.4/1.0 2.4 1.0
79-1-X-X-2.6/1.5 2.6 1.5
79-1-X-X-3.0/0.5 3.0 0.5
79-1-X-X-3.0/0.8 3.0 0.8
79-1-X-X-3.0/1.0 3.0 1.0
79-1-X-X-3.0/1.6 3.0 1.6
79-1-X-X-3.2/0.8 3.2 0.8
79-1-X-X-3.2/1.1 3.2 1.1
79-1-X-X-3.2/1.5 3.2 1.5
79-1-X-X-3.5/0.8 3.5 0.8
79-1-X-X-3.5/1.6 3.5 1.6
79-1-X-X-3.6/1.5 3.6 1.5
79-1-X-X-4.0/1.1 4.0 1.1
79-1-X-X-4.0/1.3 4.0 1.3
79-1-X-X-4.0/1.6 4.0 1.6
79-1-X-X-4.0/2.0 4.0 2.0
79-1-X-X-4.1/2.0 4.1 2.0
79-1-X-X-4.5/1.6 4.5 1.6
79-1-X-X-4.8/2.4 4.8 2.4
79-1-X-X-5.0/1.6 5.0 1.6
79-1-X-X-5.0/3.0 5.0 3.0
79-1-X-X-5.5/1.6 5.5 1.6
79-1-X-X-5.5/3.2 5.5 3.2
79-1-X-X-6.0/1.6 6.0 1.6
79-1-X-X-6.0/3.2 6.0 3.2
79-1-X-X-6.0/4.0 6.0 4.0
79-1-X-X-6.4/1.6 6.4 1.6
79-1-X-X-6.4/3.2 6.4 3.2
79-1-X-X-8.0/5.0 8.0 5.0
79-1-X-X-8.0/6.0 8.0 6.0
79-1-X-X-9.0/6.4 9.0 6.4
79-1-X-X-9.5/6.4 9.5 6.4
79-1-X-X-10.0/7.0 10.0 7.0
79-1-X-X-10.0/8.0 10.0 8.0
79-1-X-X-12.0/8.0 12.0 8.0
79-1-X-X-15.0/12.0 15.0 12.0
79-1-X-X-16.0/12.0 16.0 12.0
79-1-X-X-20.0/16.0 20.0 16.0

The X must be replaced for the desired base material code and conductive material code

Solid extrusionSolid O-profiles

Solid extrusion
Solid
Part numberDiameter (mm)
79-2-X-X-1.0 1.0
79-2-X-X-1.2 1.2
79-2-X-X-1.4 1.4
79-2-X-X-1.6 1.6
79-2-X-X-1.8 1.8
79-2-X-X-2.0 2.0
79-2-X-X-2.4 2.4
79-2-X-X-2.6 2.6
79-2-X-X-2.8 2.8
79-2-X-X-3.0 3.0
79-2-X-X-3.2 3.2
79-2-X-X-3.5 3.5
79-2-X-X-4.0 4.0
79-2-X-X-4.5 4.5
79-2-X-X-4.8 4.8
79-2-X-X-5.0 5.0
79-2-X-X-5.4 5.4
79-2-X-X-5.5 5.5
79-2-X-X-6.0 6.0
79-2-X-X-6.4 6.4
79-2-X-X-7.0 7.0
79-2-X-X-7.5 7.5
79-2-X-X-8.0 8.0
79-2-X-X-8.5 8.5
79-2-X-X-9.0 9.0
79-2-X-X-9.5 9.5
79-2-X-X-10.0 10.0
79-2-X-X-11.0 11.0
79-2-X-X-12.0 12.0
79-2-X-X-15.0 15.0
79-2-X-X-18.0 18.0
79-2-X-X-20.0 20.0

The X must be replaced for the desired base material code and conductive material code

Cell rubberCell rubber O-profiles

Cell rubber
Cell Rubber
Part numberDiameter (mm)
79-3-X-X-2.1 2.1
79-3-X-X-3.0 3.0
79-3-X-X-3.5 3.5
79-3-X-X-4.0 4.0
79-3-X-X-4.5 4.5
79-3-X-X-5.0 5.0
79-3-X-X-5.5 5.5
79-3-X-X-6.0 6.0
79-3-X-X-6.5 6.5
79-3-X-X-7.0 7.0
79-3-X-X-7.5 7.5
79-3-X-X-8.0 8.0
79-3-X-X-8.5 8.5
79-3-X-X-9.0 9.0
79-3-X-X-9.5 9.5
79-3-X-X-10.0 10.0
79-3-X-X-11.0 11.0
79-3-X-X-12.0 12.0
79-3-X-X-15.0 15.0
79-3-X-X-18.0 18.0
79-3-X-X-20.0 20.0
79-3-X-X-22.0 22.0
79-3-X-X-25.0 25.0

The X must be replaced for the desired base material code and conductive material code

Rectangular extrusionRectangular

Rectangular extrusion
Rectangular
Part numberWidth (mm)Height (mm)
79-4-X-X-0.25/1.0 0.25 1.0
79-4-X-X-0.25/1.5 0.25 1.5
79-4-X-X-0.25/2.0 0.25 2.0
79-4-X-X-0.25/2.5 0.25 2.5
79-4-X-X-0.25/3.0 0.25 3.0
79-4-X-X-0.5/1.0 0.5 1.0
79-4-X-X-0.5/1.5 0.5 1.5
79-4-X-X-0.5/2.0 0.5 2.0
79-4-X-X-0.5/2.5 0.5 2.5
79-4-X-X-0.5/3.0 0.5 3.0
79-4-X-X-0.8/1.0 0.8 1.0
79-4-X-X-0.8/1.5 0.8 1.5
79-4-X-X-0.8/2.0 0.8 2.0
79-4-X-X-0.8/2.5 0.8 2.5
79-4-X-X-0.8/3.0 0.8 3.0
79-4-X-X-1.0/1.0 1.0 1.0
79-4-X-X-1.0/1.5 1.0 1.5
79-4-X-X-1.0/2.0 1.0 2.0
79-4-X-X-1.0/2.5 1.0 2.5
79-4-X-X-1.0/3.0 1.0 3.0
79-4-X-X-1.5/1.0 1.5 1.0
79-4-X-X-1.5/2.0 1.5 2.0
79-4-X-X-1.5/3.0 1.5 3.0
79-4-X-X-1.6/1.0 1.6 1.0
79-4-X-X-1.6/1.6 1.6 1.6
79-4-X-X-1.8/1.0 1.8 1.0
79-4-X-X-1.8/1.6 1.8 1.6
79-4-X-X-2.0/1.0 2.0 1.0
79-4-X-X-2.0/1.6 2.0 1.6
79-4-X-X-2.0/2.0 2.0 2.0
79-4-X-X-2.0/3.0 2.0 3.0
79-4-X-X-2.4/2.0 2.4 2.0
79-4-X-X-3.0/2.0 3.0 2.0
79-4-X-X-3.2/1.6 3.2 1.6
79-4-X-X-12.7/1.6 12.7 1.6
79-4-X-X-12.7/2.0 12.7 2.0
79-4-X-X-12.7/3.0 12.7 3.0
79-4-X-X-12.7/4.8 12.7 4.8
79-4-X-X-15.9/1.6 15.9 1.6
79-4-X-X-15.9/2.0 15.9 2.0
79-4-X-X-19.0/2.0 19.0 2.0
79-4-X-X-22.35/1.6 22.35 1.6
79-4-X-X-22.35/2.0 22.35 2.0
79-4-X-X-25.4/6.4 25.4 6.4

The X must be replaced for the desired base material code and conductive material code


Advantages

  • Easy to fit into grooves
  • Deflection up to 50%
  • Low closure force

Options (on request)

  • Cut into accurate lengths or endless O-rings
  • Drop-out prevention fixtures
  • UL94V-0 flame-retardant version
  • High temperature-resistantSilicone core (up to 220°)
Holland Shielding Systems B.V. Holland Shielding Systems B.V.
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