Some more data in case anyone else is thinking of using gelatin as a glue, not all gelatins are equal. The "bloom" strength is measured the same as glue "gram strength" (the gram strength is measured using the bloom process so its just two words for the same thing).
TFWW has a pretty decent overview of the various gram strengths
https://www.toolsforworkingwood.com/store/item/ms-hidegl.xx/hide_glue
I was a bit off and knox is towards the high end but not as high as I'd though, more towards the upper mid range.
There are some questions about the gram strength versus stickum power. Gram strength specifically measures how easy it is to deform a cake of the gel under very specific conditions. Some folks claim that glues are a more complex mix of proteins versus the more refined gelatin which increases the stickum power (makes some sense in the abstract), but I haven't seen anyone do a 1:1 comparison and there are certainly people using knox with success in high strength applications (like guitar and violin bindings).
http://www.modernistpantry.com/gelatin-sheets-silver.html
"Gelatin used in food usually runs from 125 Bloom to 250 Bloom" - that's a huge range, the low end there would be marginal for most glue applications.
"The most popular are Silver grade (160 Bloom) and Gold grade (190/220 Bloom).".
Found a bit longer but a more complete list here, which I've preserved a summary table of for posterity in case the link goes stale.
http://luckypeach.com/opusculum-six-things-to-consider-about-gelatin/
Gelatin Grade | Bloom Strength | Weight per sheet (g) | Approximate # sheets per 1000g |
platinum | 250 | 1.7 | 600 |
powder (Knox, Great Lakes) | 225 | 2.3/tsp | n/a |
gold | 200 | 2 | 500 |
silver | 160 | 2.5 | 400 |
bronze | 140 | 3.3 | 300 |
If you're doing a lot; plain hide glue is a lot cheaper in volume but the gelatin is easy to get to play with.