Description
DESCRIPTION :
A range of knitted wire seals with excellent electromagnetic and radio frequency interference (EMI/RFI) shielding characteristics.
Knitted gaskets reduce the leakage of unwanted fields through a joint between two parts of a metal enclosure (or metal coated plastics) by providing a continuous low resistance path between the parts (ie. a box and lid). They are also resilient enough to conform to large joint unevenness and the wiping action of the wires can improve surface contact.
APPLICATION :
The main applications are:-
- Doors and panels in enclosures and cabinets.
- Mounting conductive windows into housings.
- Mounting vents on cabinets.
OTHER FEATURES AND BENEFITS :-
- Widely available in a variety of configurations to counter most RFI/EMI shielding problems.
- Modified types available to give enhanced environmental sealing as well as RFI/EMI shielding.
- Highly resilient wire mesh used giving low compression set properties.
- Wide service temperature range possible.
- Long lasting, in service, long shelf-life in storage.
GASKET RANGE AVAILABLE
- ALL METAL MESH TYPES
ECP No. 600K.. All metal mesh, circular section
Size range : 2.0mm to 13.0mm diameter.
ECP No. 610K.. All metal mesh, square/rectangular section
Size range : Width 2.0mm to 32.0mm
Thickness : 2.0mm to 10mm
ECP No. 606K..All metal mesh, circular section + fin ( P-section)
Size range : 3.0mm to 10mm diameter
13.0mm to 25mm overall width
This number also cover a range of double circular sections joined by a fin.
Size range : 3.0mm to 10mm diameter
10mm to 32mm overall width
ECP No. 624K All metal flat bandage, about 0.5mm thick.
Size range : 6.0mm to 330mm.
- METAL MESH ON ELASTOMER SPONGE
ECP No. 602K. Metal mesh on sponge core, circular section
Size range : 2mm to 19mm diameter
ECP No. 608K. Metal mesh on sponge core, circular section plus mesh fin (P-section).
Size range : 3.0mm dia + 13mm overall width
13.0mm dia + 25mm overall width
This number also covers a range of double circular cores jointed by a fin.
Size range : to 10mm diameter core
13mm to 32mm overall width
ECP No. 612K………….. …………. Metal mesh on sponge core, square/rectangular section.
Size range : Width 3.0mm to 19mm
Height 3.0mm to 13mm
- METAL MESH ON SOLID ELASTOMER TUBING
ECP No. 604K Metal mesh on elastomer tubing, circular section.
Size range : 3.0mm to 13.0mm outside diameter.
ECP No. 609K. Metal mesh on elastomer tubing, circular section plus mesh fin.
Size range : 3.0mm to 10mm tubing
7.5mm to 28mm overall width .
This number also covers a range of double cores joined by a mesh fin.
Size range : 3.0mm to 10mm tubing
13.0mm to 32mm overall width
- CONSTRUCTIONS WITH ADDED NEOPRENE OR SILICONE SPONGE FLUID SEALS
CAN BE SUPPLIED WITH SELF-ADHESIVE BACKED TAPE.
ECP No. 614K.Metal mesh on silicone tube bonded to a rectangular silicone or neoprene sponge seal.
Size range : 3.0mm to 13.0mm tubing
3.0 x 3.0mm to 9.0 x 19.0mm seal
ECP No. 616K.Metal mesh on silicone sponge core bonded to a silicone or neoprene sponge seal.
Size range : 3.0mm to 19.0mm core
3.0 x 3.0mm to 9.0 x 19.0mm seal
ECP No. 618K.A square / rectangular metal mesh bonded to a silicone or neoprene sponge seal.
Size range : 2.0 x 3.0 mesh + 2.0 x 6.0 seal
9.0 x 6.0 mesh + 9.0 x 19.0 seal.
MATERIALS CHOICE
- Metals The majority of shielding requirements can be satisfied by using the materials below. Other speciality metals can be used.
| WIRE SPECIFICATION | DIAMETER MM | REF. |
| MONEL (BS3075-NA13) | 0.112 | MO |
| STAINLESS STEEL | 0.112 | SS |
| TIN PLATED COPPER CLAD STEEL | 0.112 | TCS |
| ALUMINIUM | 0.140 | AL |
Most applications require 2 layers of wire to achieve optimum shielding effectiveness.
Designate number of layers in mesh by prefix, e.g. 2MO (2 layers Monel).
Elastomer Core Materials EXPANDED NEOPRENE CLOSED CELL SPONGE (ASTM D-1056). This materials can be used in the temperature range of -20C to +100C. It has unlimited shelf life, but should not be exposed to direct sunlight.
Expanded Silicone Rubber Sponge. This material has good compression characteristics and is water repellent. It can be used in temperature range -60C to +200C (intermittent maximum temperature of +250C). It has unlimited shelf life when used in the range stated but not when used above +200C.
Solid Silicone Rubber. Has good compression characteristics (in tubular form) and is water repellent. It has the same temperature range tolerances as the expanded silicone rubber sponge.
GASKET COMPRESSIBILITY
Optimum Shielding and Sealing performance is obtained within the compressibility range quoted below.
| TYPE | COMPRESSION %
|
| ALL METAL MESH | 5 – 30 |
| MESH OVER SPONGE | 5 – 40 |
| MESH OVER TUBING | 10 – 40 |
| GASKETS WITH ENVIRONMENTAL SEAL
ALL METAL MESH MESH ON TUBE |
10 – 25 10 – 40 |
TYPICAL GASKET SHIELDING EFFECTIVENESS DATA (DECIBELS)
FIGURES ACHIEVED BY INDEPENDENT TESTING TO MIL-STD 285
| H – FIELD | E – FIELD |
| Frequency
MHz 0.01 0.1 1.0 10 |
0.1 1.0 10 100 400 1000 10,000 |
| Monel 28 45 64 >104 | >118 >136 123 99 96 84 46 |
| Aluminium 36 47 64 >104 | >118 >136 >120 91 76 72 34 |
| TCS 47 67 88 >104 | >118 >136 >126 109 98 77 43 |
ELECTROCHEMICAL COMPATIBILITY
To avoid galvanic action between contacting metals refer to the following chart. Materials in adjacent groups may be safely used together. Choosing materials from within a single group in the table will provide the least corrosion due to galvanic action, when the materials are in contact for an extended period of time with appropriate protective finish.
Grouping of Metals by Decreasing Galvanic Activity
| Group 1
|
Group 2
|
Group 3
|
Group 4
|
| Magnesium
Magnesium Alloys Aluminium Aluminium Alloys Beryllium Zinc & Zinc Plating Chromium Plating
|
Aluminium
Aluminium Alloys Beryllium Zinc & Zinc Plating Chromium Plating Cadmium Plating Carbon Steel Iron Nickel & Nickel Plating Tin & Tin Plating Tin / Lead Solder |
Cadmium Plating
Carbon Steel Iron Nickel & Nickel Plating Tin & Tin Plating Tin / Lead Solder Brass Stainless Steel Copper &Copper Alloys Monel |
Brass
Stainless Steel Copper &Copper Alloys Nickel / Copper Alloys Monel Silver
|
ORDERING INFORMATION
A “line call-out” is used when ordering gaskets. Dimensions are given as a four figure number, e.g. 5.0mm is expressed as -0050, etc. Metal wire references used :- Monel – MO, Stainless Steel – SS, Copper – C, Tinned Copper – TC, Tin Plated Copper Clad Steel – TCS, Aluminium – AL, Silver Plated Copper – SC.
Elastomer Core/Fluid Seal references :- Neoprene – NEO, Silicone – SIL.
The sizes and materials given for each gasket type are not exhaustive – for other sizes/materials required consult works.
Ordering Examples
Circular, All monel wire, 5.0mm diameter.
Order : ECP 600K-0050-MO.
Twin Neoprene sponge cores, 6.0mm diameter, stainless steel wire mesh, 19.0mm overall width.
Order : ECP 608K-0060 x 2 – 0190-SS-NEO.
Silicone Tube, 5.0mm diameter, aluminium wire + neoprene sponge fluid seal,
3.0 x 12.0mm with self adhesive backing.
Order : ECP 614K-0050SIL-0030-0120-AL-NEO/SAB.
ECP 614K, 616K, and 618K are supplied in lengths up to 10 metres long or as finished gaskets to customers specifications. The sponge can be accurately die cut to size and compression stops/collars fitted to eliminate the risk of overtightening the gaskets.
Tolerances on Dimensions
Long length gaskets : body size + 0.8mm, fin. size + 1.6mm.
ECP 614K, 616K and 618K – gaskets with fluid seals.
Mesh size + 0.8mm fluid seal size + 0.8mm.
Finished gaskets : + 0.8mm up to 300mm. Hole centres + 0.4mm.
Information in this publication and otherwise supplied to users is based on our general experience and is given in good faith, but because of particulars which are outside our knowledge and control and affect the use of product, no warranty is given or is to be implied with respect to such information. Freedom from patent rights must not be assumed.
