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  1. #1
    chuck94022's Avatar
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    Scotch PMA opinion?

    Does anyone have experience using Scotch Positionable Mounting Adhesive? It claims to be "Acid-Free", which they qualify to be "Ph of 7 or greater as determined by modified ASTM D778-97 (by extraction)", whatever that means.

    They also say it is "Photo Safe".

    Does "Acid-Free" mean archival? They don't use that word anywhere on the box, so I'm suspicious.

  2. #2
    Ole
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    I guess it means they think it's safe, are willing to assume it's safe, and even willing to say it's safe - but don't want to be sued if it isn't?
    -- Ole Tjugen, Luddite Elitist
    Norway

  3. #3
    Bob F.'s Avatar
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    In The Permanence and Care of Color Photographs, Wilhelm Imaging Research (big download here ) they state that 3M Scotch No. 568 Positionable Mounting Adhesive is OK for RC prints - not for fibre (pp 369).

    Bob.

  4. #4
    Ian Grant's Avatar
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    The 3M (Scotch) spray adhesives are great for many uses.

    I've used them extensively for mounting commercial work with Resin Coated papers, B&W and Colour, and prints mounted 25/30 years ago are fine.

    However I'd never dream of using them with Fibre Based papers prefering Dry mounting if it was required.

    Ian

  5. #5
    chuck94022's Avatar
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    Thanks all!



 

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