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Dual Conformal Coating

IP.com Disclosure Number: IPCOM000239498D
Publication Date: 2014-Nov-12
Document File: 1 page(s) / 51K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for coating electronic hardware such as a Printed Circuit Board (PCB) with a dual layer of conformal coating.

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This is the abbreviated version, containing approximately 65% of the total text.

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Dual Conformal Coating

The feature spacings on printed circuit boards (PCBs) are becoming closer, some as small as 0.15 mm. Thus, the neighboring features on PCBs are becoming more prone to electrical short circuiting. Further, the miniaturization of surface mount components continues. Smaller components have less protection against the ingress and the corrosive action of airborne particulate matter and gaseous contamination. Information Technology (IT) equipment is proliferating in polluted geographies high in particulate matter and gaseous contamination. Thus, there is a need to protect the PCBs and the components soldered on them from the corrosive particulate matter and gaseous contamination. Silicone has generally been the conformal coating of choice to protect electronic hardware from ill effects of pollution. The advantage of silicone conformal coating is that it can be relatively easily peeled off to allow reworking of the PCBs. But silicone scavenges sulfur gases from air, which can attack underlying components of

the PCB that contain silver.

Disclosed is a conformal coating that protects the PCBs against particulate matter and gaseous contamination and allow rework of the PCB. . method for coating an electronic hardware such as a PCB with a dual layer of conformal coating.

Firstly, a thin conformal layer made of silicone and having a thickness of, but not limited to, less than 100 ┬Ám is used to deposit over the PCB or components of the PCB. The silico...