Reply by lumbering_on

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Posted on Glue removal tip wanted...

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578 posts in 1003 days

#1 posted 11-05-2018 12:22 AM

Tact time is a function of the glue strength. The typical HHG has a gram strength of around 250 and that gives you an open time of around 10 minutes. The stronger glues that run over 300 gram strength will have an open time of about one minute.

If you re going to use LHG, go with Old Brown over Titebond, it s much better from the tests.

- lumbering_on

I agree that tack time is a function of gram strength but disagree on a couple of your other points. The general woodworking strength is usually given as 192gm. I prefer the somewhat slower 180 gm but there is little difference.
You must have a much hotter shop than I if you are getting 10 minutes open time with 250 gm HHG. The much slower 192 and 180 that I use, even on the hot side at 150F, gives me only a couple of minutes before it starts to gel.

High gram strengths are mostly used as far as I know by luthiers glueing relatively small joints that must endure high stresses.

- shipwright

I’ll have to go dig out the package and see what it is. I was sure I was using 251 gram strength, but you could be correct, I could be using the 192 gm. I haven’t used it in a few years as it was for a course I was doing, and I could have sworn that they said it was 251 gm that was normal, and 192 was for non-stressed joints. However, I’ve been mistaken on a few things lately that I used to be able to rhyme off without any problems.

My memory’s been fading so badly that I forget I’m getting old. :(

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