I strongly agreed with you on the last statement. Potting and conformal coating served two different
applications altogether :8)

Regards - Wee Mei

Hinners Hans M Civ WRALC/LUGE wrote:

> Hi Wee Mei,
>
> To echo what others have already said.
>
> Your colleague can also check the manufacturer's coating thickness
> recommendation for a specific product.  (I'm sure that's where IPC-A-610 got
> the numbers.)
>
> I strongly recommend staying within the acceptable range.  My personal
> preference is to target slightly higher than the middle of the spec., if the
> range is broad enough.  I've run into problems, on the processing side, when
> someone specified well above the max. and we had hideous solvent retention.
> Folks using conformal coating as a potting compound are not my friends.
>
> Hans
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Hans M. Hinners
> Electronics Engineer
> Warner Robins - Air Logistics Center (WR-ALC/LUGE)
> 226 Cochran Street
> Robins AFB GA 31098-1622
>
> mailto:[log in to unmask]
>
> Com: (478) 926 - 5224
> Fax:   (478) 926 - 4911
> DSN Prefix: 468
>
> -----Original Message-----
> From: fullname [mailto:[log in to unmask]]
> Sent: Thursday, May 30, 2002 10:27 PM
> To: [log in to unmask]
> Subject: [TN] Coating thickness
>
> IPC-A-610C section 9.1.3 mentioned the following coating thickness :
> Type AR Acrylic resin    0.03 - 0.13mm
> Type ER Epoxy resin    0.03 - 0.13mm
> Type UR Urethane resin    0.03 - 0.13mm
> Type SR Silicon resin    0.05 - 0.21mm
> Type XY Paraxlyene resin    0.01 - 0.05mm
>
> Questions asked on behalf of my colleague are :
> 1. How does one arrive at the coating thickness for each types of
> coating material?
> 2. What is the impact to my board or components if my coating thickness
> exceed or below the range stated above?
>
> Regards - Wee Mei
>
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