--- On Mon, 6/21/10, Pat Horne <pat@hornesystemstx.com> wrote:
> From: Pat Horne <pat@hornesystemstx.com>
>
> Most of that kind of protective film is held on by static
> charge, so I
> wouldn't expect any adhesive to be present.
Not exactly true. For modern electronics, yes. In the past for electronics,
and still current for industrial and transportation applications, there is a
cross-linked adhesive, typically acrylic, used. Adhesive starts out as a low
tack removable, and the cross-linking helps to keep the adhesive on the
protective film and prevent transfer to the protected good.
Over time the two surfaces become more intimate, and the adhesive builds in
strength. Therefore, the longer it's there, the harder it is to remove. My
guess is that the cross-linking also boosted the chemical resistance, hence the
reduced effect of solvent now.
Heat to soften and letting solvent soak on the surface for a while are the best
chances. Maybe a light sanding?
Ron
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