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Conductive plastic enclosures have inherent EMC properties

Posted: 16 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:hammond electronics? 1594? enclosure?

Hammond Electronics announced a significant market advance with the introduction of RFI-capable versions of its 1594 heavy-duty small enclosure family. The 1594 cases are molded in a metal-loaded plastic that gives attenuation levels of more than 50dB from 100MHz to 1,000MHz.

According to the company, the light weight, low cost and style of a plastic enclosure can now be combined with EMC screening capability for applications where it is needed. The performance of the loaded material is far in excess of anything that can be achieved by spraying or painting a conductive layer onto a normal box, and as the screening is an intrinsic property of the material itself, there is less susceptibility to damage during assembly or normal use, added Hammond. Screening is achieved by loading the plastic with steel to give a hybrid material that exhibits the characteristics of its constituent parts. By closely controlling the ratios between the metallic and plastic materials, the company was able to overcome one of the most significant manufacturing issueexcessive tool wearwhile maintaining attenuation levels that are high enough to be useful in the real world.

The 1594 has a 3mm thick wall to give good mechanical and EMC protection. It is available in five sizes, ranging from 56-by-56-by-40mm to 167-by-107-by-65mm.

- Henri Arnold

Electronics Express Europe


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