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March 2004

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 9 Mar 2004 09:03:53 -0800
Content-Type:
text/plain
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text/plain (125 lines)
        Thanks for the correction.
        Ramon

> -----Original Message-----
> From: Crepeau, Phil (Space Technology)
> Sent: Tuesday, March 09, 2004 10:44 AM
> To:   Dehoyos, Ramon
> Subject:      RE: [TN] FW: [TN] Pros and Cons on Type UR vice Type AR
Conformal Coating
>
> i think you meant type ar not ur.
>
> -----Original Message-----
> From: Dehoyos, Ramon (NG)
> Sent: Tuesday, March 09, 2004 6:08 AM
> To: [log in to unmask]
> Subject: [TN] FW: [TN] Pros and Cons on Type UR vice Type AR Conformal
> Coating
>
>
>         One of the disadvantages of UR coating is that it will not
withstand
> solvents. Besides  boards in  aircrafts that might be closed to the fuel
> tank or in automobile  engine compartments, most boards are not in
proximity
> to fuels, acetone or alcohol. So UR is plenty good. It saves a lot of
boards
> from being damaged during rework due to the simplicity of removal.
>         Regards,
>         Ramon
>
> > -----Original Message-----
> > From: Dehoyos, Ramon
> > Sent: Tuesday, March 09, 2004 8:15 AM
> > To:   [log in to unmask]
> > Subject:      Re: [TN] Pros and Cons on Type UR vice Type AR Conformal
> Coating
> >
> >         One thing to know is that AR can be coated to patch UR but not
the
> > other way around. Patching AR with UR creates a mix that takes too long
to
> > dry, stays soft. So to switch from UR to AR is recommended.
> >         Regards,
> >         Ramon
> >
> > > -----Original Message-----
> > > From: - Bogert [SMTP:[log in to unmask]]
> > > Sent: Monday, March 08, 2004 4:55 PM
> > > To:
> > > Subject:      [TN] Pros and Cons on Type UR vice Type AR Conformal
> Coating
> > >
> > > As a Class 3 customer we are considering mandating transition from
Type
> UR
> > to Type AR conformal coating, to make it easier to replace failed
> > components.  Are there any Class 3 users of Type AR coating?  What is
> track
> > record for using Type AR?  Are there any compatibility issues with
certain
> > types of solder masks?  Any input you have would help.  Another
advantage
> > with AR would be for returned equipment.  The OEM could remove all the
> > coating from an assembly using alcohol, then perform
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