[bolger] Re: boiling test
My thinking on the boiling test is that, in practical terms, it is
irrelevant to boatbuilding. The proof is all of the boats that have
been built with plastic resin glue that have survived years.
I am sure that a case can be made for this tests relevance, as a case
can be made for most things, but beware. If you buy into this test you
will have to quit using epoxy as a glue and coating material because it
definitely wont pass the boiling test. In fact, many epoxies start to
soften at less than 150 degrees! This does not prevent them from being
used successfully in tropical and dessert climes.
In my opinion, a better test is to glue up a couple pieces of wood and
place them in your dishwasher. If the joint survives for a couple of
weeks of wash and dry cycles it is OK. I also use this test on suspect
plywood.
irrelevant to boatbuilding. The proof is all of the boats that have
been built with plastic resin glue that have survived years.
I am sure that a case can be made for this tests relevance, as a case
can be made for most things, but beware. If you buy into this test you
will have to quit using epoxy as a glue and coating material because it
definitely wont pass the boiling test. In fact, many epoxies start to
soften at less than 150 degrees! This does not prevent them from being
used successfully in tropical and dessert climes.
In my opinion, a better test is to glue up a couple pieces of wood and
place them in your dishwasher. If the joint survives for a couple of
weeks of wash and dry cycles it is OK. I also use this test on suspect
plywood.
Boiling increases the energy in the system, speeding up reactions that would
normally take months or years. If your glue is at all soluble in water, it
might take months or years to dissolve at normal exposures and temperatures,
but will dissolve in boiling water in an hour or so.
Brett Roper wrote:
normally take months or years. If your glue is at all soluble in water, it
might take months or years to dissolve at normal exposures and temperatures,
but will dissolve in boiling water in an hour or so.
Brett Roper wrote:
> As I understand it the boiling can happen in moisture soaked surfaces
> exposed to the sun. Eg. a boat deck in Australia's summer can be too hot
> to walk on barefoot: I can imagine moisture near the glue lines boiling
> under those conditions.
>
> Don't know if this is the reason for the boiling test. It's just
> something I've been told.
>
> Brett.
>
> > However, it fails the "boil, cyclic loading test" which I
> > think is the same
> > reason Weldwood isn't considered exterior glue. Still don't
> > understand the
> > boiling.
>
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As I understand it the boiling can happen in moisture soaked surfaces
exposed to the sun. Eg. a boat deck in Australia's summer can be too hot
to walk on barefoot: I can imagine moisture near the glue lines boiling
under those conditions.
Don't know if this is the reason for the boiling test. It's just
something I've been told.
Brett.
exposed to the sun. Eg. a boat deck in Australia's summer can be too hot
to walk on barefoot: I can imagine moisture near the glue lines boiling
under those conditions.
Don't know if this is the reason for the boiling test. It's just
something I've been told.
Brett.
> However, it fails the "boil, cyclic loading test" which I
> think is the same
> reason Weldwood isn't considered exterior glue. Still don't
> understand the
> boiling.