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Re: [BKARTS] PVA;: what Elmer's is that?

Thanks Bill,

I also have many old pieces I periodically play with.  The ones I've used mixture on are also doing well, not to mention some with Elmers' (for experimental sake of course, cough)..  It reminds me of the definitive test done on the Shroud.  They were supposed to close the door on the questions (wasn't it Stoller)- until the tests were found to be flawed, and we're back to square one.

> ----- Original Message -----
> From: "William Minter" <wminter@xxxxxxxxxxxxxx>
> To: BOOK_ARTS-L@xxxxxxxxxxxxxxxx
> Subject: Re: [BKARTS] PVA;: what Elmer's is that?
> Date:         Fri, 3 Feb 2006 15:22:05 -0500
> Bruce,
> I whole-heartedly agree with your comments about adhesives, 
> especially with the accelerated aging at 100 degrees.
> For many years, I have been trying to suggest that we prepare test 
> pieces, keep them around the shop and look at them regularly. At 
> the same time, I feel it is important that we go back and look at 
> the work that has been done to access how well things are holding 
> up in REAL LIFE. This certainly is easier for our fellow 
> conservators who work in libraries where they can walk out into the 
> stacks and look at their work; its a little harder for those of us 
> in private practice (independent binders/conservators). The 
> response that I hear from various colleagues is that they do not 
> take the time to look at their earlier work. We could learn a lot 
> from the occasional examination of earlier work where we/they know 
> what materials were used.
> I have some samples of PVA mixtures (Jade 403 with wheat paste and 
> methyl cellulose) that are now 25 years old. During one of the 
> early GBW Standards conferences, we heard the experts say that 
> mixing adhesives is a bad thing to do because the adhesive could 
> fail all of a sudden after many years. I have not seen any failure, 
> and I hope that nothing happens, as I have been using the same mix 
> for all these years.
> I also have some polyester film encapsulation test samples from 
> Elaine Schlefer that are now 22 years old. The samples provide a 
> good insight into the changes that are occurring --- but that is 
> another story.
> Bill Minter
> On Feb 3, 2006, at 12:06 PM, Bruce Levy wrote:
> > To my knowledge, PVA acidity is quite different when it is wet 
> > and when it's dry.  One needs to be careful about throwing data 
> > around without pointing out the criteria for collecting such 
> > data.  If "conservation" PVA is significantly less acidic (maybe 
> > a buffer was added like calcium carbonate- I have no idea) how 
> > does that effect it's adhesive properties eg.  does it hold as 
> > long, better, worse?  What happens when it "crosslinks", does it 
> > just crumble into white powder?   Has anyone done a dry test from 
> > the various PVA's-especially with the improved PVA's produced in 
> > the last 15-20 years? Oh yes, also, the archival tests.  What 
> > about the possibility that 100 degrees for so much time might not 
> > really be a fair comparison TO REAL LIFE AND TIME?
> ******************************
> William Minter Bookbinding & Conservation, Inc.
> 4364 Woodbury Pike
> Woodbury, PA  16695
> 814-793-4020
> Fax:   814-793-4045
> Email:    wminter@xxxxxxxxxxxxxx
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