Re: Gloy is NOT PVA

David, just out of curiosity, what do your sources say Gloy is made
of, if not PVA?

Products do change over time, as you say; my vague but perhaps
imperfect understanding is that gloy was once made of gum arabic and
later came to be made from PVA, just as Elmer's glue was once made
from milk products (hence the cow logo) and later changed to PVA.

The designation PVOH to distinguish polyvinyl alcohol from polyvinyl
acetate may be useful here to help us keep them straight, but isn't
a term used in the literature about dichromated polyvinyl alcohol,
where it is simply referred to as PVA. There was a discussion here a
year or two ago about the difference between the two; if you're
interested you might look at that.
Katharine

On Mar 26, 2006, at 4:39 AM, davidhatton@totalise.co.uk wrote:

> Hi Terry (and thanks to those who replied),
>
> It is from the horse's moth that Gloy is made up of PVA + a
>
>> plasticiser+a preservative.
>>
>>
>
> Personally I have a problem with horses finding them the least
> reliable of creatures fit only to be rendered into glue as soon as
> possible. The
> reason for the headline is that I have reason to believe that this
> is not the case No PVA in Gloy). I'm not a chemist but why does PVA
> require a
> preservative and a plasticiser? Is PVA not an adequate adhesive in
> its own right?
>
> The my 'research' shows Gloy as a brand to be part of the
> historical record at least as early as 1918 and I suspect that PVA
> was not in the
> mainstream of adhesive manufacture at that time. Could it be that
> the current Gloy has been re-engineered in recent years with modern
> components ? The original ingredients would have deteriorated
> without a preservative I agree, but surely not PVA (unless the
> plasticiser is
> corn syrup or something).
>
> Any thoughts?
>
> David H
>
>
>
>
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Received on Sun Mar 26 11:51:40 2006