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Hide glue gram strength

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Muskyman:
Planning on buying some hide glue and the gram strength is what I’m wondering about..
I’ve included this photo I got online that shows different gram strengths. I’m thinking the 192 gram strength is what I would want because it says it’s less brittle. Anyway I thought I’d ask if anyone has any input they’d like to share.

Hamish:
Is the glue for a specific task, like sinew backing, rawhide backing etc.
Only ever used gelatine for an animal based glue, but I think one of the bowyers bibles hade a list of various glues and their relative strengths.

My guess is all those glues you mentioned will do a decent job, for most bowmaking tasks (obviously some will be slightly superior for a certain task, and that is what you want to know).
Someone who is an aficionado in composite bows, and sinew backing will chime in soon. They seem to know the most about glue strength and specificity for purpose. Isinglas (sturgeon swim bladder) seems to be the most prized from memory, but is very expensive.

superdav95:
The glue I used in past with good results is 192 high strength high clarity.  The glue I make is equivalent to something between 192 and 251 high strength hide glue.  It’s made from sinew scraps actually.  I find this glue to be superior to the 192 high strength clear.  I’ve also made sturgeon bladder glue but like hamish said it’s very expensive.  The sturgeon bladder glue would be equivalent to 192 very clear high strength with added benefit of being water and moisture resistant.  It also has slightly slower set time too which is nice.  I would get the 192 strength clear variety.  It will work very well.  Be sure to size the back very well with very thin watery glue to let it soak down deep into the pours of the wood to yield good adhesion.  If you go with the 251 you will find the open working time reduced and gells up quicker.  Getting the proper balance of glue to sinew ration is important too as this will give best results.   Too much glue will just crack and too little glue will starve the sinew and peel off or delaminate. 

willie:
see:
http://www.primitivearcher.com/smf/index.php?action=search2
http://www.primitivearcher.com/smf/index.php/topic,54099.msg734592.html#msg734592

I looked for the PDF and dont have it anymore, its very informative

look on the contact page at his site and email him.  good place to buy.

my experience is you might appreciate the working time and temps of the lower weight glues if you are using it with sinew

Muskyman:
Yeah it’s for sinew Willie. Forgot to mention what I was planning on using it for. Forget where it was I was looking at the hide glue at,  might have been a violin shop.
Appreciate the replies.

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