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Electrically conductive coatings for EMI shielding

24 January 2008

Chomerics Europe, a division of Parker Hannifin Corporation, has introduced two new electrically conductive epoxy coatings for shielding of electronic enclosures. Both CHO-SHIELD 576 and CHO-SHIELD 579 offer shielding performance of up to 60 - 80dB in the 30MHz to 1GHz range.

The two component, silver-filled epoxy materials provide excellent EMI and environmental protection, and may be applied to a target surface using either conventional spray equipment or a brush. They are dry to the touch in less than one hour at room temperature and may be fully cured at elevated temperatures.

CHO-SHIELD 576 can be applied to glass, plastic or epoxy substrates and is suitable for copper/tin plating. CHO-SHIELD 579 offers a low-VOC (volatile organic compounds) rating of 357 grams/litre, 40% lower than its predecessor.

Both materials have a volume resistivity of 0.06 ohm/sq. and a shelf life (at 24ºC) of 9 months.


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