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  • 1.  B-72 problems

    Posted 09-23-2022 18:59
    Hello!
    Does anyone have any suggestions on how to make an acetone/B-72 mixture less stringy? I typically would just buy something premade from Gaylord but my institution already had the B-72 pellets so I took a shot at making it myself.

    Thanks in advance!

    Corinne

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    Corinne Tabolt
    Collections Manager
    Gunn Memorial Library & Museum
    Washington CT
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  • 2.  RE: B-72 problems

    Posted 09-26-2022 08:16
      |   view attached
    Hi Corrine, 

    I would suggest making a mixture of 60% acetone/40% ethanol. It slows the setting time a bit. (Source: Stephan Koob / (B-72 adhesive god)

    I have uploaded an article for those interested:
    Effect of solvent on PARALOID
    ® B72 and B44 acrylic resins used as adhesives in conservation
    • Armand Vinçott, Emmie Beauvoit, Nicolas Boyard and Elodie Guilminot


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    Craig Deller
    Fellow
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    Attachment(s)

    pdf
    Effects of solvent on PARALOID® B72 and B44.pdf   941 KB 1 version
    Original Message


  • 3.  RE: B-72 problems

    Posted 09-26-2022 08:16
    Corrine,
    I should have added this article by Stephan: 

    Manipulating materials: Preparing and using Paraloid B-72 adhesive mixtures

    https://resources.culturalheritage.org/osg-postprints/v25/koob/

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    Craig Deller
    Fellow
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    Original Message


  • 4.  RE: B-72 problems

    Posted 09-26-2022 08:16
    When working with the pellets, it often takes several days for them to properly dissolve into solution if you don't have access to a vibrating or magnetic mixer as typically found in chemistry labs.   To facilitate the process of getting the pellets evenly dissolved, many people in the paleontology community will suspend the pellets using a cotton bag or tea strainer to prevent clumping.  One example of those methods can be seen here:

    https://www.zoicpaleotech.com/pages/paraloid-b72-in-fossil-preparation  

    Patricia Holroyd
    Senior Museum Scientist
    Museum of Paleontology
    University of California
    Berkeley CA

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    Patricia Holroyd
    Senior Museum Scientist
    University of California Museum of Paleontology
    Berkeley CA
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    Original Message


  • 5.  RE: B-72 problems

    Posted 09-26-2022 10:18
    I would increase the ratio of solvent to the B-72 resin, provided that did not adversely affect the suitability of the product for what you're using it for.

    Vernon Weckbacher
    Archivist/Curator
    Mission Historical Museum
    956-580-8646



    Original Message


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