[Nhcoll-l] Paraloid B-67 in naphtha....

[Tocci (Lewis-Gentry), Genevieve E.]

Dear Cory,

Here is what our conservator has to say, hope it is helpful.

Best,
Genevieve

This acrylic resin is soluble in mineral spirits if the solvent contains a fractional aromatic content (xylene or toluene). Hardware store VM&P Naptha is not always
up to grade for preparing solutions of B-67 as a barrier coating. Laboratory grade solvents are a better choice. Fisher Scientific or VWR or Museum Services Corporation are sources.
Cory Redman might try adding a small amount of isopropanol or acetone or xylene to his solutions to see if the gooey mass dissipates.

ConservationSupportSystems<https://conservationsupportsystems.com/main> :
Paraloid B-67
RECOMMENDED SOLVENTS: Shell Mineral Spirits 135, Shell M/S 145, Shell Sol 71, Shell Sol 340, Shell Sol 100, Xylene and Toluene.

Best,
Scott

Scott E. Fulton
Conservator, Ware Collection of Blaschka Glass Models of Plants
Harvard University Herbaria
22 Divinity Avenue
Cambridge, MA 02138

617-496-6183
sfulton at fas.harvard.edu<mailto:sfulton at fas.harvard.edu>



=================================================
Genevieve E. Tocci (she, her, hers)
Senior Curatorial Technician
Harvard University Herbaria
22 Divinity Ave., Cambridge, MA 02138  U.S.A.
Phone: 617-495-1057  Fax: 617-495-9484
glewis-g at oeb.harvard.edu

From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> On Behalf Of Cory Redman
Sent: Tuesday, January 7, 2020 12:10 PM
To: nhcoll-l at mailman.yale.edu
Subject: [Nhcoll-l] Paraloid B-67 in naphtha....

I have tried dissolving Paraloid B-67 in naphtha and mineral spirits that were purchased from a local hardware store with no success.  The B-67 has just turned into a large gooey mass at the bottom of the container and no amount of agitation or time (going on 4+ weeks) seems to help.  What am I doing wrong?

I am very familiar working/mixing Paraloid B-72 in acetone or ethanol, but this is my first time using B-67 and yes, I need to use B-67 in naphtha for the objects being numbered.

I would appreciate some help/tips/guidance.  I haven't been able to find anything in the literature, but I probably am missing a key paper(s).

--
Cory M. Redman (BSc; MSc; PhD)
Science Curator
Grand Rapids Public Museum

272 Pearl Street NW
Grand Rapids, MI 49504
www.grpm.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.grpm.org&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=EYdhJ0HrhAMcA2aVQ-I4N7lml00zxsXPbHYeP7843No&m=ospwV_PkDvU7wXAiH619X54uU3iHdhsQ32xMZR25vx0&s=mZ75wb8ubsjMZ2czVN2cczzdhQzbBP07yoXBYXuMc98&e=>

office: 616:929:1766
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