Subject: Re: [baidarka] Glue
From: Michael Neverdosky (1twidget@gmail.com)
Date: Thu Apr 06 2006 - 14:35:07 EDT
I think your temperatures are too high by an order of magnitude.
I would agree with 350 F and 400 F
To stand 3500 F requires some special ceramic composits that few of us
will ever play with.
The big problem with a "heat gun" is the high temp makes it easy to
overheat a spot.
A hair dryer is much more gentle and safer for localized warming.
A good temperature controlled oven with air circulation is best.
michael
On 4/6/06, Calman, Scott <scott@ucsd.edu> wrote:
> Be careful with the heat gun. Here is my experience:
>
> I work for a Structural Engineering department at a major university. One of the things we do are large composite lay-ups as structural reinforcement of concrete and steel structures, as well as some composite UAV aircraft component work. One of the key things they do to get a full cure with epoxy is what they call a "Post-cure bake" we built a 12'X 24' oven that we can move the components into and then quickly heat them up to 3500f. for 1 hour. If you overheat them, they become brittle and do not survive. I asked the guys what "overheat" means and they said anything over 4000f. for more than 10 minutes. Mind you, most of the pieces they are using are a lot bigger and thicker than anything we do so adjust your time down.
>
> A heat gun can put out significantly more heat than 3500f. so be careful and baffle the thing. I actually caught a small lay-up I was doing on fire once and now bake my small parts in the oven in the house.
>
> Scott Calman
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