470-0016-2250-10000

ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER Product Overview Oriented wire in silicone is an RFI/EMI/EMP shielding gasket material. The sheets are available in a range of thicknesses. Each sheet contains thousands of thin monel or aluminium wires that pass through the sheets thickness. These wires are crimped to form a slight zigzag which means that they do not drastically affect the compression forces required to make a seal. The wire types allow the designer to select the product best suited to their galvanic compatibility requirements. The softer blocks have a wire density of 100 wires/cm2. The harder blocks have a wire density of 140 wires/cm2. The wires are chemically bonded to the silicone or fluorosilicone during the manufacturing process. The elastomer provides the environmental sealing component, while the wires provide electrical grounding and the shielding aspect of the product. Under compression, the wires have bite into the mating surface and penetrate through thin oxide layers providing low contact resistance A choice of silicone and wire variants are available allowing this product to be used in a wide range of applications. The three material groups are 410/420, 450/460, and 470/480. 410/420 grades are 40 Shore A solid silicone with monel/aluminium wires. These grades are for use in applications where higher compression forces allow for better environmental sealing. 450/460 grades are 50 Shore A solid fluorosilicone with monel/aluminium wires. These grades are available for use in environments where fuels/oils/hydraulic fluids and other contaminants are present. 470/480 grades are 20 Shore A soft silicone with monel/aluminium wires. These grades are for applications that require lower compression forces. Kemtron Ltd developed these new grades of materials to fulfil a need that meets the performance of silicone sponge materials but with improved environmental sealing qualities. We have achieved this by using a very soft solid silicone with a reduced wire count of 100 wires per cm2 which is the same as silicone sponge. The advantages of these new materials over silicone sponge are that we can manufacture increased sheet widths of up to 225mm with a minimum thickness of 0.8mm. Material consistency is a great advantage over silicone sponge as there is no uneven cell structure to consider that can affect moisture ingress and closure force. Application • A good solution for achieving RFI/EMI/EMP and environmental sealing in a single gasket • Ideal for use as access panels, seals, connector gaskets etc • Good conformity to allow for uneven surfaces PERFORMANCE MATERIALS / ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER 2 Availability Kemtron Ltd. is now part of TE Connectivity, can offer a wide variety of options as the in-house manufactured material is cut from large blocks. The blocks are manufactured in either 150mm or 225mm widths. The sheets are cut using our high-speed slicer, enabling us to offer all thicknesses (subject to material type) to suit the customer’s exact design requirement. • Die-cut gaskets • Large fabricated gaskets • Sheet material • Strip material available in continuous lengths • Self-adhesive backing to allow for easy assembly • Can be fitted with compression limit stops or collars • Small gaskets can be punched in one operation, keeping production costs to a minimum • Larger gaskets can be produced cost effectively and without the constraint of sheet size limitation from strips of material fabricated into the required finished shape, thus avoiding waste material from the centre of the gasket • A fluorosilicone version is available for use in environments where fuels/oils/hydraulic fluids and other contaminants are present • Solid silicone 410/420, for use in applications where higher compression forces allow for better environmental sealing • Soft solid silicone 470/480 for applications that require lower compression forces Design Considerations It is important that oriented wire in silicone isn’t over compressed. If the design of the equipment does not allow for any mechanical method of preventing over-compression, by means of a compression limiting stop, the gasket should be fitted with compression limiters. These can be either compression stops or collars. Stops and collars are normally manufactured in a material that is suitable for the galvanic compatibility requirements and take the form of precisely manufactured cylinders or washers. There is no need for a conductive connection where strips or sheets are joined. This is because the wires forming the EMC contact run through the thickness of the sheet. An environmental seal is achieved by vulcanising the mating join with the corresponding silicone or fluorosilicone adhesive. The material is not suitable for frequent opening/closing or sliding applications. If your application requires this functionality, please contact your customer services representative at TE Connectivity or Kemtron Ltd. Recommended compression: 15% to 20% Tolerances: Sheet Widths +0.0/-5mm Thickness ± 0.13mm When specifying an oriented wire in fluorosilicone (450/460): self-adhesive backing (SAB) is not recommended for use with this type of elastomer. This is due to the SAB’s component chemical’s ability to perform in line with the fluorosilicone elastomer. Typically, SAB is supplied with a shelf life of 6 months. Minimum material width should not be less than 2mm or at least the material thickness in any part of the gasket. If this cannot be achieved around fixing holes, consider using a slot. Particular attention is required if specifying compression collars in holes. Particular consideration must be given to compression forces (see data in this section) hole centres, size and number of fixings and rigidity of mating flanges. PERFORMANCE MATERIALS / ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER 3 Production Capabilities Kemtron Ltd. holds large stocks of raw material blocks, which are cut in-house on one of the most advanced slicing machines in Europe, and which enables us to produce bespoke gaskets economically and on time. We are able to cut sheets up to 228mm wide by 1000mm long, whilst holding a parallel tolerance of ± 0.2mm and can apply self-adhesive backing prior to die cutting and or fabrication. Gasket fabrication is a routine feature of our work, enabling us to produce economic gaskets by maximising material usage, without the limitations of sheet width. Joins are vulcanised using a silicone compound and overcompression stops or collars can be fitted to the gasket if required. Our in-house production facilities are suitable for prototype, short and medium production runs, up to commercial quantities. Compression Limit Applications 10mm 10mm Limit stops min Ø 3.0mm Limit collars Horseshoe Slot Horseshoe slot Insufficient land Minimum Land 2mm Land are (or thickness of material if over 2mm) PERFORMANCE MATERIALS / ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER 4 Typical Shielding Performance Frequency 410/450 Dimensional Tolerances 420/460 430/470 440/480 20 Mhz 94 95 94 94 40 Mhz 96 96 99 96 60 Mhz 100 97 99 100 100 80 Mhz 99 98 100 100 Mhz 111 105 109 111 200 Mhz 111 105 109 111 400 Mhz 112 107 105 110 600 Mhz 110 103 102 108 800 Mhz 116 110 109 116 1 Ghz 111 111 107 111 2 Ghz 106 112 112 112 4 Ghz 98 97 95 101 6 Ghz 91 90 89 90 8 Ghz 90 90 87 92 10 Ghz 84 89 84 88 Typical Closing Force Required Code Material Thickness Compression % N/cm2 410/420 0.8mm 10% 17 0.8mm 15% 36 0.8mm 20% 49 1.6mm 10% 20 1.6mm 15% 45 1.6mm 20% 81 2.4mm 10% 58 2.4mm 15% 83 2.4mm 20% 97 0.8mm 10% 15 0.8mm 15% 38 0.8mm 20% 61 1.6mm 10% 22 450/460 470/480 • Linear ± 0.8mm • Hole Centres ± 0.4mm • Thickness ± 0.13mm • Sheet length +/- 10 mm Handling Considerations Care should be taken when handling this material as any exposed metal points may scratch unprotected skin. Material Types and Sizes Part No. Material Min Thickness Sheet Width(s) Max Sheet Length 410 Monel wires in solid silicone 0.8mm 225mm (+0/-5) 1000mm 420 Aluminium wires in solid silicone 0.8mm 225mm (+0/-5) 1000mm 450 Monel wires in solid Fluorosilicone 0.8mm 150mm (+0/-5) 1000mm 460 Aluminium wires in solid Fluorosilicone 0.8mm 150mm (+0/-5) 1000mm 470 Monel wires in Soft solid Silicone 0.8mm 225mm (+0/-5) 1000mm 480 Aluminium wires in soft solid silicone 0.8mm 225mm (+0/-5) 1000mm How to Order To order strips use the material type number followed by the thickness and width (expressed as 4 digits to one decimal place). Add SAB to the end of the part number if you require self-adhesive backing. Examples 420-0008-0032SAB = 0.8mm thick aluminum wires in solid silicone, width 3.2mm with self-adhesive backing. 1.6mm 15% 52 1.6mm 20% 88 2.4mm 10% 78 2.4mm 15% 102 Material 2.4mm 20% 129 Monel wire in solid silicone 410 0.8mm 10% 14 Aluminium wire in solid silicone 420 Standard Strip Material Material Code 0.8mm 15% 27 Monel in Solid Fluorosilicone 450 0.8mm 20% 36 Aluminium in Solid Fluorosilicone 460 1.6mm 10% 37 Monel wire in soft solid silicone 470 1.6mm 15% 43 Aluminium wire in soft solid silicone 480 65 1.6mm 20% 2.4mm 10% 41 2.4mm 15% 45 2.4mm 20% 55 * The above data is representative of results from tests and show forces that you should expect to experience. When using these figures you should allow for tolerances in the gasket material and also on the hardware. These figures are given as a guide only. PERFORMANCE MATERIALS / ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER 5 Material Code Height Width Part No. 410 420 450 460 470 480 0.8mm 3.2mm 0008-0032 0.8mm 4.8mm 0008-0048 0.8mm 6.4mm 0008-0064 0.8mm 9.5mm 0008-0095 0.8mm 12.7mm 0008-0127 1.6mm 4.8mm 0016-0048 1.6mm 6.4mm 0016-0064 1.6mm 9.5mm 0016-0095 1.6mm 12.7mm 0016-0127 1.6mm 15.9mm 0016-0159 1.6mm 19.1mm 0016-0191 2.4mm 4.8mm 0024-0048 2.4mm 6.4mm 0024-0064 2.4mm 9.5mm 0024-0095 2.4mm 12.7mm 0024-0127 2.4mm 15.9mm 0024-0159 2.4mm 19.1mm 0024-0191 Material Specifications Wire Monel BS 3075 NA13 – QQ-N-281-B Aluminium BS EN 573 pt3 – Alloy 5056 Elastomers Specifications Temp Range Colour Silicone Solid A-A-59588 -60°C to 200°C Light Grey Soft Silicone Solid A-A-59588 -60°C to 200°C Light Grey Fluorosolicone MIL-R-25988 G 50 -55°C to 200°C Blue Test Standard Solid Silicone Tensile strength ASTM D412 2.5 MPa Elongation ASTM D412 250% PERFORMANCE MATERIALS / ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER 6 Notice Information supplied in these data sheets is based on independent and laboratory tests which Kemtron believes to be reliable. Kemtron Ltd. has no control over the design of customer’s product which incorporates Kemtron’s products, therefore it is the responsibility of the user to determine the suitability for his particular application and we recommend that the user make his own test to determine suitability. The product described in this data sheet shall be of standard quality, however the products are sold without warranty of fitness for a particular purpose, either expressed or implied, except to the extent expressly stated on Kemtron’s invoice, quotation or order acknowledgement. Kemtron does not warrant that products described in this data sheet will be free of conflict with existing or future patents of third parties. All risks of lack of fitness, patent infringement and the like are assumed by the user. 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TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application. ©2022 TE Connectivity. All Rights Reserved. 08/22   Original PERFORMANCE MATERIALS / ORIENTED WIRE IN SILICONE AND FLUOROSILICONE RUBBER