Concoat Ltd. (Fleet, UK) has engineered a water-based conformal coating addition to its Humiseal range that can protect electronics assemblies at temperature extremes beyond the capabilities of existing resin-based alternatives. The performance characteristics of Humiseal 1H20 stem from a new water-based chemical formulation that was engineered by Concoat and took over a year of research and development to produce.

"1H20 is currently undergoing qualification testing between -65°C and +185°C," said Concoat's technical director, David Greenman. "Because the top end figure is at least 50°C higher than conventional resin materials, this product will be especially relevant to the automotive industry where upper performance limits are ideally rated at 180°C for engine bay electronics."

As water-based coatings, the series is also environment-friendly to meet with the drive in Europe to reduce volatile organic compounds (VOCs).

Concoat's chief chemist Phil Kinner, said, "The coating is both safe and easy-to-use, it has a superior 8kV breakdown voltage that is higher than conventional resin, it is extremely flexible and offers excellent chemical and mar resistance, and is repairable. And by being non-hazardous and low odor, it greatly reduces the demands on fume extraction equipment."

Managing director Graham Naisbitt said, "It also meets the growing demand for higher performance conformal coating materials capable of protecting modern printed circuit boards (PCBs) that exploit ever greater packaging densities allied with reduced conductor widths and spacings that are now being used in increasingly hostile operating environments."

1H20 AR7 Par 2 is qualified to MIL-I-46058C and IPC CC-830B. UR3 meets requirements for IPC-CC-830B and UR4 MIL-I and CC-830-B are pending.

www.concoat.co.uk

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