Most of the Kemtron conductive elastomer profile range is available as O-Rings in all electrically conductive silicone & fluorosilicone grades. Non-conductive silicone and fluorosilicone O-Rings are also available.

Small solid section O-Rings up to 15mm inside diameter will normally be compression moulded using multi cavity flash free tooling. This manufacturing method ensures very fast delivery for large volumes. Larger O-Rings are made by joining extruded strip, the jointing compound is electrically conductive ensuring good shielding integrity. Tube section O-Rings must extruded and jointed. Extruded and jointed O-Rings can be any size with developed length of many meters.

Performance

Kemtron’s Electrically Conductive Silicone Elastomer materials tests are performed in house and by external laboratories all using calibrated equipment, testing to the standard specified in MIL-DTL-83528. Kemtron offer the performance data and methods of testing to MIL-DTL-83528 for comparison only.

All of Kemtron’s test certificates and reports are available upon request. The results were obtained in laboratory conditions and should be used as a guide only. Customer hardware and many other factors are beyond our control. Therefore, customers should perform their own tests to ensure suitability of the product for the desired performance.

Materials

• Silver-plated aluminium in silicone or fluorosilicone
• Silver plated copper in silicone or fluorosilicone
• Silver plated glass in silicone or fluorosilicone
• Nickel coated graphite in silicone or fluorosilicone
• Pure nickel in silicone or fluorosilicone
• UL94V0 grade of nickel coated graphite in silicone

Applications

O-Rings are the most cost-effective form of seal and can be small section and small diameter for applications such as jam nut seals for connectors, waveguide flange seals, sealing screw fixings and more. Large diameter O-Rings need to located in a groove or channel in the enclosure sealing face. This groove can take a complex route around the enclosure sealing off fixing screws. The groove also forms a compression stop for the O-Ring gasket and has the added advantage of improving shielding effectiveness by achieving metal to metal contact. Moisture or pressure sealing will also be achieved by using O-Ring seals however they are only designed for static applications.

• Industrial controls
• Instruments
• Military equipment
• Avionics
• Medical electronics
• Electronic equipment enclosures’

Flat gaskets are cut from moulded sheet using state of the art reciprocation knife cutting technology or rule dies. Larger gaskets can be cut from moulded or fabricated picture frames. This option has the advantage of saving material and allows larger gaskets to be produced most efficiently. Fabricated frames use either extruded or moulded flat section that is joined by vulcanizing the polymer. We use the same conductive polymer compound to vulcanize the joints ensuring complete electrical conductivity is maintained across the joint. This process has allowed Kemtron to produce gaskets up to 2 metres long, with the same mechanical and electrical integrity as found in a single part gasket cut from sheet. This method of manufacture often offers cost savings over cutting from sheet which creates significant loss of waste material. Our in-house production facilities are suitable for prototype, short and medium production runs, as well as commercial quantities.

Performance

Kemtron’s Electrically Conductive Silicone Elastomer materials tests are performed in house and by external laboratories all using calibrated equipment, testing to the standard specified in MIL-DTL-83528. Kemtron offer the performance data and methods of testing to MIL-DTL-83528 for comparison only.

All of Kemtron’s test certificates and reports are available upon request. The results were obtained in laboratory conditions and should be used as a guide only. Customer hardware and many other factors are beyond our control. Therefore, customers should perform their own tests to ensure suitability of the product for the desired performance.

Materials

• Silver-plated aluminium in silicone or fluorosilicone
• Silver plated copper in silicone or fluorosilicone
• Silver plated glass in silicone or fluorosilicone
• Nickel coated graphite in silicone or fluorosilicone
• Pure nickel in silicone or fluorosilicone
• UL94V0 grade of nickel coated graphite in silicone

Applications

Surface mounted gaskets are to be used where groove mounted gaskets such as O-Rings cannot be accommodated.

With surface mounted elastomeric gaskets, the aim should be to limit the compression of the gasket to between 10% and 20%. 10% is the minimum recommended compression with a solid silicone style of gasket. (Some form of compression stop or limit is essential with surface mounted gaskets to prevent over compression). Compression stops can be built into many styles of gasket or made as an integral part of the flange. Their height should equal that of the maximum compressed height of the gasket. Compression stops fitted into gaskets can be in the form of collars or washers so that fixing bolts can pass through them or as solid studs located either side of a fixing bolt. We can supply a range of standard stops and collars in stocked materials. We are also able to offer special sizes and materials as required.

• Industrial controls
• Instruments
• Military equipment
• Avionics
• Medical electronics
• Electronic equipment enclosures’

Kemtron manufacture a wide range of extruded profiles from our standard tooling. We are also able to produce to your exact requirement with minimal tooling cost.

Extruded profiles are available in continuous lengths, cut lengths or fabricated to your requirements, such as O-Rings or rectangles by vulcanizing the joints. The vulcanising process uses the same conductive polymer compound ensuring complete electrical conductivity is maintained across the joint.

Performance

Kemtron’s Electrically Conductive Silicone Elastomer gasket material tests are performed in house and by external laboratories all using calibrated equipment, testing to the standard specified in MIL-DTL-83528. Kemtron offer the performance data and methods of testing to MIL-DTL-83528 for comparison only.

All of Kemtron’s test certificates and reports are available upon request. The results are obtained in laboratory conditions and should be used as a guide only. Customer hardware and many other factors are beyond our control. Therefore, customers should perform their own tests to ensure suitability of the product for the desired performance.

Profiles

Tube, Cord, Solid D, Hollow D, Channel, Strip and custom profiles.

Materials

• Silver-plated aluminium in silicone or fluorosilicone
• Silver plated copper in silicone or fluorosilicone
• Silver plated glass in silicone or fluorosilicone
• Nickel coated graphite in silicone or fluorosilicone
• Pure nickel in silicone or fluorosilicone
• UL94V0 grade of nickel coated graphite in silicone

Applications

Extruded profiles are normally mounted into grooves or channels of a clam shell style enclosure, the groove will hold the conductive Silicone gasket strip in place and also provide a compression stop to prevent the custom gasket from being over compressed when the enclosure is closed, another advantage is that with metal to metal contact of the 2 faces of the clam shell will enhance shielding effectiveness.

Flat strip profiles can be applied as a surface mount gasket, electrically conductive or non-conductive self-adhesive backing can be applied to the gasket strip but this should only be considered as an aid to assembly.

• Industrial controls
• Instruments
• Military equipment
• Avionics
• Medical electronics
• Electronic equipment enclosures’

MAJR’s Honeycomb Ventilation Panels provide optimum electromagnetic/radio frequency interference (EMI/RFI) shielding with minimum pressure drop while ventilating air. Shielding effectiveness is accomplished using waveguide design principles.

Product Features:

• Built to Your Specifications: MAJR’s engineering team can assist with applications requiring special mounting or shape.
• Optimum Shielding and Air Flow: Installation of the honeycomb filter—with its 4:1 opening-to-depth ratio—provides the waveguide below cut-off effect required to attenuate EMI/RFI interference while not impeding the air flow required to cool the packaged enclosure.
• Standard Configurations: MAJR offers a wide variety of standard sizes, as seen below, which can reduce lead-time and setup charges for our customers.

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Honeycomb Waveguide Panels special design lets air flow into and out of an EMI/RFI shielded enclosure. This feature allows for the cooling of electronics as well as air circulation for manned military shelters as well as electronic boxes and cabinets.

Honeycomb Waveguide Panel Features:

• Designed to meet specific shielding, airflow, and mounting requirements.
• Available in Aluminum, Steel, Brass and Stainless Steel to meet specific attenuation and environmental requirements of MIL-STD-461 and MIL-STD 810.
• High permeability steel honeycomb available for magnetic (H-Field) shielding to 60 dB attenuation levels. (>80 dB attenuation using 1 in. thick tin plated steel honeycomb).
• Standard and custom sizes and mounting configurations available.
  An EMI/RFI gasket is always supplied as an integral part of the honeycomb vent panel assembly.
• Mounting via frame thru-holes or captive fasteners.
• Metal honeycomb core provides shielding to electromagnetic waves, facilitating waveguide beyond cuttoff.

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Shielded Air Filtration Panels filter the intake air of electronic equipment where electromagnetic/radio frequency interference (EMI/RFI) shielding is a criteria. Our filter media can be supplied as either dry or oil coated. Impingement of fine dust particles on filters with a glutinous oil coating is greatly enhanced.

Product Features:

• Multi-Purpose: Shielding, Air flow, and Dust filtration – Installation of the shielded air filter into the electronic enclosure provides an effective dust filter with minimal resistance to air flow while simultaneously providing some attenuation of electromagnetic interference.
• Standard Configurations: MAJR offers a wide variety of standard sizes, as seen below, which can reduce lead time and setup charges for our customers.
• Ease of Installation: Our Shielded air filters are supplied with EMI/RFI gasket and mounting holes or captive fasteners — ready for installation into any electronic cabinet.
• Built to Your Specifications:Many applications require a unique shape or mounting configuration. MAJR’s engineering group can assist with custom shielded air filter designs to accommodate any size requirement.

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EMI Shielded Fan Ventilation Panels are manufactured to meet the commercial market’s requirements for a low-cost, high-quality electromagnetic/radio frequency shielded ventilation panel. These units are available in five standard sizes using a 0.250″ thick honeycomb material and have an overall thickness with gasket of 0.407″.

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