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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> > -----------------------------------------------------
> > bed-of-nails testing to quickly identify failed components.
>
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