Talk:Hide glue

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how much water sould i maix with glue, the ratio?

Wrong and incomplete. Glass chipping glue is not 500 gram-strength. Generally 108 to 164. Gram strength has little to do with bond strength. It indicates viscosity and gel temperature. Lower strengths wet better and may result in a stronger bond, not weaker. Anything over 251 gels too fast to use as a glue. Maybe it's used for casting printing rollers (with glycerin for flexibility). 192 and 251 are most often sold for woodworking. I think that's too strong. 164 or 138 is better. People add too much water to make it workable and that is a very bad thing. Glycerine or sorbitol (or any hygroscopic sugars) makes it flexible. Urea or salt or any acid lowers the gel temperature. Alum or formaldehyde makes it waterproof. Phenol makes it resistant to bacterial growth.

[Davidowsky; Raw Materials and Fabrication of Glue, H.C. Baird, Philadelphia, 1884]

Franklin liquid hide glue is not weaker than fresh-mixed hot hide glue. It is, however, much more hygroscopic. The bond fails much faster at high humidity (80%) than hot hide glue does. It has short shelf life (under a year, despite what Franklin says). I suspect that the joint itself has a shorter service life as well.

Knox gelatin is made from bone. Some food-grade gelatins are made from pigskin. However, this is not kosher and less widely used than the bone variety. Fish gelatin is often used, too. No, it does not smell like fish. It has a much lower gel temperature. 60 degrees versus 90 (or thereabouts) for hide glue.

205.234.156.25 09:32, 3 July 2007 (UTC) A. Nonymous

[edit] Major problem with this article

I'm amazed nobody else seems to have noticed that this article doesn't explain what hide glue is. It explains how to use it, but not anything about how it's made, or the fact that it comes from animal parts. +ILike2BeAnonymous (talk) 19:21, 2 February 2008 (UTC)

It's a form of animal glue, perhaps the major one still in use today. I don't propose to touch this article, other than to suggest (right here now as well as in a previous edit summary) the two be merged. __Just plain Bill (talk) 03:33, 3 February 2008 (UTC)

Yes, I know that, but any poor slob who wandered by here and read this article wouldn't know that. And yes, the articles ought to just be merged and be done with it. +ILike2BeAnonymous (talk) 04:12, 3 February 2008 (UTC)

OK, unless anyone objects in the next few days, I propose to put the bulk of this article's text into Animal glue, and make this article redirect to that. __Just plain Bill (talk) 13:49, 3 February 2008 (UTC)

I'd suggest merging with hoof glue, but it's not the only form of animal glue around. Rabbit-skin glue is significant and already wiki'ed. There's also fish glue, which isn't AFAIK wiki'ed yet. I use all three of these, and I use them in quite different contexts and methods. For this reason I'd keep each separate from animal glue.

Perhaps animal glue could usefully discuss their chemistry and the common behaviour of formation by boiling connective tissue to partiaully de-nature the proteins, but the three specific pages could address their individual uses, and the differences in using them.

If anyone knows what woodworkers' "hoof glue" is, as distinct from hide glue / pearl glue / scotch glue, then I'd be fascinated to find out. I suspect it's simple wiki duplication of articles.
—Andy Dingley (talk) 14:59, 4 February 2008 (UTC)