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Oriented Wires in Silicone | Silshield

Oriented Wires in Silicone | Silshield

Specifications

Solid Silicone rubber ZZ-R-765 2b 40   
Sponge Silicone rubber AMS 3195  
Fluorosilicone rubber Mil-R-25988 Gr 50  
Monel wire BS3075 – NA13 (0.11mm diameter)
Aluminium 5056 AMS 4182 (0.13mm diameter)
Phosphor Bronze Cu Sn 6% (0.114mm diameter)

 

Temperature range

- 55 to + 250°C



Performance

Frequency Field Type SP
10 KHz H 55
100 KHz H 83
1 MHz H >100
1 MHz E >120
10 MHz E >120
100 MHz E >120
400 MHz E >100
1 GHz P 95
10 GHz P 85

Technical Drawings

SE Silshield Silshield cut gasket forms Silshield limit stops
Silshield SE Silshield Cut Gasket Silshield Limit Stops
Silshield NW Silshield Sheet Silshield Strip
Silshield NW Silshield Sheet Silshield Strip

 

 

Tolerances

  • Thickness up to 1.0mm +0.25mm –0.15mm
  • Thickness over 1.0mm ± 0.25mm

  • Width tolerance on sheet material ±1.0mm

How to order

Standard sizes may be specified from the following table.
Alternatively specify: Series-Wire Type-Thickness-Width-Adhesive backing (if required).

Shielding Series Wire Code Thickness/Width Finish
SP=Solid Silicone M=Monel xxxx-xxxx S/A=Self-adhesive
SS=Sponge Silicone A=Aluminium   N/A=No adhesive
SR=Flame Retardant Solid Silicone P=Phosphor Bronze    
SG=Flame Retardant Sponge Silicone       
SF=Fluorosilicone      
SE=Solid Silicone with Flourosilicone Edge      

Examples / Notes

Note:
Standard material length is 900mm
Examples:
SP-M-0016-0127-S/A is Solid Silicone with Monel wire 1.6 mm thick x 12.7 mm wide with self-adhesive.
SS-A-0032-1140-N/A is Sponge Silicone with Aluminium wire 3.2 mm thick x 114 mm wide no adhesive.

For strip material not shown, or specific shapes, made up gaskets and for fixing hole positions, please send a drawing and we will allocate a part number with our quotation.

Please note:

  • Strip material is available in 900mm nominal lengths and can be factory bonded into longer sections.
  • Sheet material is generally 114mm or 228mm nominal widths and can be edge bonded to greater widths.

Silshield NW EMI Shielding

Wire-free widths can be ordered where the material cross-section has wires along just one edge, or along both edges with no wires in the centre. This provides a pressure seal and EMI shield in one component but reduces the compressive force needed to fit the gasket. Please contact us to discuss your precise requirements.

Silshield SE (Duo) EMI Shielding

Silshield SE (Duo) provides the advantages of a fluorosilicone gasket with the cost-effectiveness of plain silicone. This is achieved by bonding a wire-free fluoro-edge to a standard sheet or strip during the moulding process. Fabricated gaskets have a wire-free, contaminant resistant outer edge suitable for applications where loose wires could cause problems when gaskets are subjected to solvents or hydrocarbons and are liable to soften and swell.

Download the Oriented Wires in Silicone Range as a PDF

General Information

SP, SR, SS, SG, SF and SE Shielding

Our S Shielding silicone rubbers combine excellent environmental protection with a high level of shielding effectiveness. These products incorporate a matrix of vertically oriented wires which pierce both flat faces of the elastomer and provide around 100 contact points per square centimetre.

The materials, which include solid silicone (SP Shielding) and sponge silicone (SS Shielding) variants as well as Fluorosilicone (SF Shielding), sponge silicone flame retardant (SG Shielding), solid silicone flame retardant (SR Shielding) and solid silicone with a fluorsosilicone edge (SE Shielding) options, are produced in sheet or strip form and are usually factory fabricated and diecut into gasket profiles to customers specifications.

Applications

S Shielding is probably the most versatile of gasket materials. They provide good environmental protection and are regularly used where long service life, high performance fixed gaskets are needed. Because of the harder nature of the material, and because it needs a strong closing force through a relatively rigid cover which is screw fixed at regular intervals, they are not generally suitable for doorseals or other applications where a regular opening and closing application applies. The possible exception to this is the SS Shielding.

They are usually supplied in gasket, strip or sheet form with a pressure sensitive adhesive backing which holds the gasket in the absence of a groove or channel. If a groove is available the gasket form is often a jointed 'o' ring without the adhesive backing.

Because S Shielding elastomers are wider than they are high when specifiying the thickness should be stated first as this will be the length of the embedded wires. Then, if the height needs to be greater than the width (i.e. to fit into a groove), there will be no doubt about your actual needs.

Particular care needs to be taken over the design of gaskets to ensure that fixing covers or doors do not distort during compression. It is often necessary to incorporate 'limit stops' into the gaskets to prevent over-compression. The material should be compressed by approximately 15% of its relaxed height. Please contact us for technical advice.