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RE: paleonet Butvar-76 vs. Acryloid-B72



Does anyone have any idea about the shelf-life of these products?

Judith Harris
Professor Emerita
University of Colorado Museum
P.O. Box 278
Chama, NM  87520
505-756-1813

-----Original Message-----
From: paleonet-owner@nhm.ac.uk [mailto:paleonet-owner@nhm.ac.uk]On
Behalf Of Ken Leonard
Sent: Wednesday, January 15, 2003 9:22 AM
To: paleonet@nhm.ac.uk
Subject: Re: paleonet Butvar-76 vs. Acryloid-B72


Howdy!

Mike's approach sounds like another approach to essentially the same thing I
do with PVA.

My primary concern with _any_ product of not-fully documented formulation
is, simply, that it's not fully documented:  I'm not sure what I'm getting,
and I can't even be assured that I'm getting the same thing from time to
time over time.  I'm just constitutionally averse to that syndrome.

Making-up my own PVA is a bit more work, but I prefer to have a strictly
known, consistently repeatable composition.

Your own mileage, of course, may vary.

Best regardz,
Ken


----- Original Message -----
From: "Mike Everhart" <mike@oceansofkansas.com>
To: <paleonet@nhm.ac.uk>
Sent: Tuesday, 14 January, 2003 21:54
Subject: Re: paleonet Butvar-76 vs. Acryloid-B72


> All,
> At the risk of sounding REALLY low-tech on the issue of consolidants and
> adhesives, I'd like to pass on my field experience with using a
commercially
> available adhesive called "Bond 527 Multi-Purpose Cement" which is readily
> available in a 3.2 oz. (White tube, red and blue lettering) tube in the
> crafts section of your local WalMart store.
>
> I am as concerned as anyone with chemical exposure and was surprised to
see
> that the labeling on the tube doesn't include all the incredients, but I
> suspect it's basically what modelers call "airplane glue" .... the solvent
> is clearly indicated as acetone.  Years ago, I remember it was labeled
with
> the main ingredient (PVA?).  A note on the tube does say: "This label
> conforms to ASTM D4236-89 & California Prop. 65"
>
> While you are certainly not going to buy it in large enough quantities to
> preserve your next T-rex, one tube mixed with a pint or so of acetone
makes
> a very good consolidant in the field for a lot of smaller things, while
the
> 'goop' straight out of the tube bonds broken pieces together rather
quickly
> and firmly.  It is soluble in acetone.... and in field comparisons, it
> doesn't whiten in response to damp material like Butvar seems prone to do.
> I imagine you could dump several tubes into a gallon of acetone if you
> wanted a large batch, but I generally mix it one tube at a time.
>
> I've been using it for 15 years now in the Smoky Hill Chalk for
> consolidating small, fragile items like fish skulls and pteranodon wing
> bones, and have had no problems.
>
> At any rate, if you are looking for something that is cheap, readily
> available, easily reversible and dependable for fossil critters smaller
than
> the size of a dinosaur in the field, I can certainly recommend this
> material.
>
> Low tech regards,
>
>
> Mike Everhart
> Adjunct Curator of Paleontology
> Sternberg Museum of Natural History
> Fort Hays State University, Hays, KS
> http://www.oceansofkansas.com
>
>
>
>
>






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