[pianotech] Gram weight question

Ron Nossaman rnossaman at cox.net
Mon Jun 8 10:30:08 MDT 2009


jim ialeggio wrote:
> 
> Great thread
> 
> Hey Ron,
> 
> I'm trying to understand In practical terms the difference between 192g 
> and 251g hide glue. I have been using 251 for everything but have a lb 
> of 192 to play with.
> 
> In practical terms, how is the 192g going to behave differently from 251g...
> 
> Do I have this right...
> 
> 192g will achieve a thinner viscosity with less water?

Don't know. I don't measure water. I just splash around until 
I like the look of it. The 192g will get thinner without 
losing it's initial tack and gel than will 251g though.


> Given a similar working viscosity, same temp, 192 will gel quicker than 
> 251 because it has less water to lose?

The stuff doesn't gel by losing water. It gels by cooling and 
protein linking. Too much water kills the gel. So at matching 
viscosities, the 192g can be made thinner and still function 
than can the 251g. The 251g, mixed thick enough to gel 
quickly, works very well for hanging hammers, where the 192g 
gels a bit slower and is more likely to sag some.

> In well fit joint, given similar working viscosity 192 leave more cured 
> glue in the joint than 251, since less of it is water?

I have no idea.


> What about bushings?

I like the 192g better. It can be mixed fairly thick, for 
minimal penetration into the cloth, and still be manageable 
and controllable with a small brush.

Either of these gram weights will work for any of the jobs 
you'd use hot hide on, you just have to adjust the mix and 
approach to accommodate. At least I do.
Ron N


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