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Subject: UV stabilization of acrylic coatings

UV stabilization of acrylic coatings

From: Stephen Koob <koobs>
Date: Thursday, January 11, 1996
Mark Vine <100436.3447 [at] compuserve__com> writes

>I am told that Ciba-Geigy's "Tinuvin" range of ultra-violet
>stabilizers has less than 5 years life expectancy. Should UV
>stabilizers be added to clear acrylic coatings (such as
>Acryloid/Paraloid B67 or B72) and if so are there any stabilizers
>with a longer life expectancy.

I would discourage the addition of "Tinuvin" stabilizers to
Acryloid/Paraloid B-72 coatings as B-72 does not have a significant
susceptibility to UV damage.  I do not know the sensitivity of B-67,
but since you comment that the "Tinuvin" has less than 5 years' life
expectancy, I would doubt the benefits.  When possible, leave the
resins alone.  Plasticizers and additives tend to affect both
application and aging properties.

Stephen Koob
Department of Conservation and Scientific Research
Freer Gallery of Art
Smithsonian Institution
Washington DC 20560
202-357-4880 x276

                  Conservation DistList Instance 9:54
                Distributed: Thursday, January 11, 1996
                        Message Id: cdl-9-54-002
Received on Thursday, 11 January, 1996

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