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Subject: Hot melt adhesives

Hot melt adhesives

From: Tony Sigel <asigel>
Date: Thursday, July 22, 2004
The following is posted on behalf of Narayan Kandekar

    Amanda Pagliarino <amanda.pagliarino [at] qag__qld__gov__au> writes:

    >analysis of some metal coupons from the Oddy tests.  Following
    >testing two adhesives from 3M proved to be suitable for long term
    >use: 3792-LM which is a lower-melt adhesive for foams, and 3748
    >which is higher-melt and suitable for plastics and fluted
    >polypropylene board.  The 3M applicator guns are also well designed
    >and durable.

    The analytical lab at the Straus Center for Conservation at
    Harvard University carried out Oddy tests of 3M Hot melt glue
    #3748, and #3764 earlier this year. #3748 was designed to be
    used in electronic applications, and is marketed as
    non-corrosive to copper. Both passed the Oddy test with silver
    but produced orange/red corrosion on copper and orange crystals
    on lead.

Tony Sigel
Associate Conservator of Objects and Sculpture
Straus Center for Conservation
Harvard University Art Museums
32 Quincy Street
Cambridge, MA 02138
Fax: 617-495-0322

                  Conservation DistList Instance 18:9
                  Distributed: Thursday, July 22, 2004
                        Message Id: cdl-18-9-003
Received on Thursday, 22 July, 2004

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