I went to my local 'finishes' supplier today and bought some hide glue. I asked about glue strength as I thought I remembered reading about it somewheres. They phoned the manufacturer and told me that the hide glue had a "bloom gel factor" of between 130 and 140 grams at 12.5% concentration. Is this ok for instrument use. I'm looking to repair a very small crack that has appeared in the maple back of my IV kit and also to mix with some Lycopodium power kindly sent me by another forum member. I'm not sure if I'd be confident to use it for actual assembly as I haven't used hide glue for decades. All the hide glue I have seen does not mention glue strength.