Have you tried "bubble gum remover" ?
Its basically a tin of freezer spray.

>-----Original Message-----
>From:  Graham Naisbitt [SMTP:[log in to unmask]]
>Sent:  Thursday, August 12, 1999 3:44 PM
>To:    [log in to unmask]
>Subject:       [TN] Cooked Latex Mask
>
>Fellow Techies,
>
>Hope someone out there can help with this one:
>
>We have a customer with a number of VERY EXPENSIVE assemblies onto which has
>been put some peelable latex masking material. (NOT OURS BTW!)
>
>These assemblies were then placed into an oven at 80Deg C (175Deg F - 176 for
>those who want precision :>) ) overnight. Unfortunately the fan in the oven
>broke so they were exposed to 130 Deg C for some time, estimated at 6 hours.
>
>As you might imagine, this has not done the latex any good at all. It pretty
>much resembles the gum you leave on the bedpost overnight (for 5 days!).
>
>We have tried up to and including MEK solvent without success. Of course we
>tried peeling it - but, having lost its molecular bond, it fragments too
>easily.
>
>As if that was not enough of a problem, it is inside through hole vias and
>empty sockets into which they must place some other leaded components and
>then solder them.
>
>Can anyone out there come up with a solution (liquid or metaphysical) that
>will allow total removal? Rudy, you got any suggestions?
>
>Regards,
>Graham Naisbitt
>
>[log in to unmask]
>
>WEB: http://www.concoat.co.uk
>
>CONCOAT Ltd
>Alasan House, Albany Park
>CAMBERLEY GU15 2PL UK
>
>Tel: +44 (0) 1276 691100  Fax: +44 (0) 1276 691227 << File: ATT00238.html >>

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