Andy

Graham is correct. HDBK-830 is the better choice. It is a guide to help
people understand everything about the coating application. It even
includes a section on measuring, 8.11.1. The CC-830 is a material
qualification spec only. It is the spec outlining all the testing
requirements of conformal coatings. It is what the coating manufacturers
follow to qualify their products. Actually, the handbook does a great job
of explaining the relationship of the different IPC specs in sections 2.15
& 2.16.

We are like Jeff. We measure with coupons for thickness verification after
the coating is dry to the touch. You can use a micrometer or as many do, a
device like the Defelsko Positector.

Lloyd Duso
Diamond-MT
(814) 535-3505
www.Diamond-mt.com


On Mon, Aug 17, 2020 at 7:49 AM Andrew Hoey <[log in to unmask]>
wrote:

> Hi Graham,
>
> Thanks for the help,
>
> We overlooked micrometers to be honest!
>
> I have a copy of the HDBK-830, is the CC-830 more suitable?
>
> We conformal coat a variety of boards due to customer requirements - most
> of them are flying or going underwater.
> We've been conformally coating for about 6 years now but it recently got
> picked up by an auditor that our verification methods were not adequate,
> hence our attempts to put proper controls in place before those pesky
> auditors return!
>
> Thanks,
>
> Andy
>