Black opaque conformal coating enhances PCB security

To enhance security of electronic products, the Dymax Multi-Cure 9451 is a black, opaque conformal coating from Intertronics. By hiding the PCB and components from visual inspection, security is enhanced, says the company. It is an effective barrier to loss of confidentiality and possible copying or reverse engineering of proprietary designs, as well as improving circuit reliability in harsh conditions.

The UV/light and heat cure coating is suitable for most circuit assemblies. It may be applied manually or in automatic spray equipment, in a single pass of up to 0.125mm thickness. Coating which finds its way into shadowed areas is cured using a secondary heat process.

For thicker coating requirements, the material can be applied in multiple passes. It becomes immediately tack-free after light curing, helping to avoid handling defects, such as fingerprints, which may be left on boards if they are handled too soon, and protecting against other damage caused by stacking and arranging PCBs during processing. The coating can be applied to a variety of substrates including glass reinforced epoxy laminates, glass and stainless steel with a good adhesion. Whilst the coating has been developed to cover sensitive information, it can be reworked/removed without damage to the underlying circuitry.

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