HomeRoast Digest

Topic: Tim Strikes Again! (5 msgs / 138 lines)
1) From: Carl Thomas
I had occasion to chat with the legendary Tim at Fresh Roast today.  Seems
my old (less than one year) Fresh Roast developed a crack in the bakelite
collar around the bottom of the roasting chamber that seals it to the base.
Since it's bonded to the glass, it won't drop off, but on one side the crack
goes all the way through from top to bottom and could constitute a blowby
leak.  I asked Tim if he could suggest any way to seal it at the operating
temperatures of the unit. I have this thing about wanting to salvage stuff
like this rather than replace it.  Tim suggested using an epoxy, but didn't
know if there were any with a high enough temperature rating to survive.  He
though DAP might make one, but wasn't sure.  He volunteered to replace the
chamber, but I told him I'd call him back if I failed to seal it.  Somehow,
the idea of replacing the chamber every year is not very appealing. Since I
haven't seen this brought up as a Fresh Roast problem on the list since I
joined it last year, this unit may be a straggler.  That would be more
comforting, actually, since a replacement would then be more likely a long
term solution (infant mortality, you know).
If anybody has some suggestions for a high temp (~400-450F) epoxy seal, I'd
appreciate hearing about it.
Carl T.
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2) From: Ryuji Suzuki -- JF7WEX
From: "Carl Thomas" 
Subject: +Tim Strikes Again!
Date: Wed, 23 Jan 2002 00:09:14 -0500
I tried to search for epoxy resin with highest temperature resistance
before, but the best was still well under that range. There are some
other resins that can sustain higher temperatures for limited duration
of exposure. They (including epoxy) lose strength as heat exposure
prolongs, and the deterioration is cumulative. It's not just below or
above specified temperature limit kind of thing.
Ryuji Suzuki
"I can't believe I'm here.
People always say that I'm a long way from normal."
(Bob Dylan, Normal, Illinois, 13 February 1999)
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3) From: Simpson
Don't use epoxy, use a hi-temp silicone gasket material like versachem's
hitemp red. Good to like 550. I use it all the time in the heating sections
of my roaster hacks. Available at auto parts stores.
*********** REPLY SEPARATOR  ***********
On 1/23/2002 at 12:09 AM Carl Thomas wrote:
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4) From: Henry C. Davis
Marine-Tex is used to patch marine engine blocks (among thousands of other
things) so it would withstand the changes in temp, but I am not sure it is
suitable for contact with food. If the crack is not touching where the beans
are, and you run several roasts either without beans or with ones you throw
away, you would probably be able to use Marine-Tex to patch it and then
outgas the repair completely before using it for actual roasting. High temp
silicone repair caulk that is rated foodsafe would also be a good

5) From: Carl Thomas
Thanks to the folks who responded.  I think I may have some of the gasket
seal.  The cracks in the ring are outside the roasting chamber where it fits
into and sets on the base, so exposure to the beans should be no problem if
I only use it at the top of the crack outside the base.  The crack isn't
that big and I have yet to detect any significant blowby, but yeh, verily an
ounce of prevention  and all that.  I also didn't think to ask Tim if he
knew what they used to seal the glass and perforated plate to the ring to
begin with.  It looks like a dark organic.  Oh, well.  I'll give the gasket
sealer a try and if that fails, Tim volunteered a new one chamber.  But,
gee, I just hate to give up on the old one.  Comes from my younger days with
old cars.
Thanks again.
Carl T.
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