Hi David

Fair question, but a Gage test shouldn’t be pertinent to a device such as this, I simply requires calibration from time-to-time.

The last time I investigated this topic, such instruments struggled for accuracy when dealing with transparent coatings, so it would be advisable to check they can do that.

Graham Naisbitt
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P: +44 12 5252 1500

IPC
Vice Chair 5-30 Cleaning & Coating
Chair 5-32b - SIR & ECM
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GEN3 - Chairman & CEO

> On 17 Aug 2020, at 13:31, David Bealer <[log in to unmask]> wrote:
> 
> Has anyone been able to run a passing Gauge R&R on a device like the Defelsko Positector?
> 
> David Bealer
> Sr. Process Engineer
> office 800-637-2645 x6022   cell 217-474-8760
> 
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of lduso - Diamond-MT.com
> Sent: Monday, August 17, 2020 7:22 AM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal coat wet to dry evaporation
> 
> [External Sender]
> 
> 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
>> 
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