EMC & Circuit Protection
resistance to galvanic corrosion allowing use even in harsh salt-spray or salt-fog conditions. Ann innovative nickel- aluminium filler ensures EMI shielding of greater than 90dB. In applications requiring only sealing
properties, products such as non- conductives can be used. These form-in- place materials provide high resistance to a wide variety of fluids, excellent substrate adhesion, low hardness, and outstanding compression-set properties.
Dispensing process Gasket dispense systems are available from various manufacturers, and are
typically compatible with most form-in- place gasket materials. Making the best material selection for a given application, and programming the dispenser, are both important to achieve a controlled, repeatable process for forming the gasket. To assist selection and process design, some material manufacturers offer guidance and numerous guidebooks are available. In addition to providing detailed specifications to aid material selection, handbooks will provide useful design guidance including information on how to optimise the housing design onto which the material will be applied, as well as design considerations relating to gasket
Figure 3: Comprehensive help is available to optimise the deposition process for a given enclosure design
bead profiles and material application (Figure 3).
Conclusion Figure 2: Perfect joins can be achieved when sealing multi-compartment enclosures
Form-in-place gaskets are increasingly the solution of choice for applications requiring high shielding or sealing performance, combined with per-unit cost savings, simplified logistics, and efficient end-to-end automated assembly. Form-in- place gaskets also give the flexibility to build prototype assemblies or short production runs, and to adapt to product- design changes if necessary. A growing range of materials is now available in the market, giving designers a
broad choice of properties such as deflection force, solvent resistance, and indoor or outdoor use. High positional accuracy makes form-in-place technology ideal for use with highly miniaturised or densely populated assemblies, and perfect gaskets can be formed, even in complex shapes, given the correct choice of material and a properly optimised dispensing process.
Chomerics |
www.phstock.com
Christoph Loret is Conductive Compounds Product Manager at Chomerics Division Europe
www.cieonline.co.uk
Components in Electronics
September 2014 43
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