REFLECTOR: structural adhesive in low temperature
Scott Derrick
scott at tnstaafl.net
Mon Feb 13 12:09:05 CST 2006
I've never tried Pro-Set Epoxy System because I was told it required
high post cure temps.
Now that I see that they do have two hardeners that do not require this
I will definitely get some. The standard
Scott
Dave Dent wrote:
> With working on many fiberglass projects over the years, I have found
> that most of the stuff that is out there will work. But when it comes
> to the pros, like Scaled, Aeroviroment, General Atomic, and others,
> they have gone to one of the best. I have been using this product
> since 1995 and I have found none better. The best to wet out, less
> toxic,strongest, most forgiving,etc. With many test we did for NASA
> we found that Proset epoxy systems do the best. So check out this
> site and I'm sure you will be pleased with your results.
> http://www.prosetepoxy.com/laminating_epoxies.html
>
> ----- Original Message -----
> *From:* Gregotto at aol.com <mailto:Gregotto at aol.com>
> *To:* reflector at tvbf.org <mailto:reflector at tvbf.org>
> *Sent:* Monday, February 13, 2006 8:10 AM
> *Subject:* Re: REFLECTOR: structural adhesive in low temperature
>
> Grigore,
>
> From my experience working with Rutan RAF, SafeT Poxy, Alphapoxy,
> Aeropoxy, T-88, 3M 2216, etc., Scott is correct in that some
> epoxies can restart the cure process after dropping below 60, but
> the majority will not do well if you stop the cure process. What
> you end up with is a semi-cured part. It may feel hard to the
> touch, but will not obtain the target structural properties. I
> would wait for warmer weather if you cannot heat the area for at
> least 24 hours. And removing semi-cured epoxy to start over is
> hard to do as it gums up the surface of your abrasives.
>
> Also, you will want to stay away from using the kerosene-type jet
> heaters like Reddy heaters as they produce particulate combustion
> matter in the air that still retains a minute amount of
> pretroleum(oily). While it shouldn't hurt the epoxy, it is
> definitely hard to make sure it will not get into a finished area
> causing a potential for fish-eyes in the paint (if pre-cleaning
> isn't really-really thorough).
>
> From Experience,
> Greg Otto
> Velocity STD FG
> Grayson County, Sherman, TX
>
>
> In a message dated 2/11/2006 6:57:01 PM Central Standard Time,
> scott at tnstaafl.net writes:
>
> No 40 degrees is way to low.
>
> The minimum will depend on the accelerator that is mixed with
> it and can
> very. There are low temp epoxy's.
>
> The aeropoxy I use has is a normal range accelerator with a
> min of 60
> F. It will take much longer to cure at 60 than 77.
>
> However, the good news is, the temp can fall below 60, it will
> stop
> curing, then when you raise it above 60 it will start curing
> again. I've
> been told you can only do this so many times and then it will
> stop
> curing, I don't really know.
>
> So you need to put a heater in the fuselage and get the temp
> up. The
> keel is major structure, so I would want to see at least 70
> degrees for
> a couple of days, or as it says heat it up to 140 for a couple
> hours.
> Watch out for a thermal runaway at a 140 temp though. If your
> fuselage
> is not one piece yet, use plastic sheet as a top so you can
> get it hot
> in there.
>
> Scott
>
> Grigore Rosu wrote:
> > The structural adhesive that came with my kit is called
> Aeropoxy
> > ES6228 Epoxy Adhesive, so it is indeed an Epoxy.
> >
> > A quick search on the web tells us that it cures in 24-36
> hrs at 77F
> > (way too high for Illinois till May or so) or in 2 hrs at
> 140F. How
> > about at 40F? Forever? Is it OK to just put it on at 40F,
> fix the
> > keel with clecos and let it there for 1 week, heating it
> occasionally
> > with a heat gun? Or I should better wait till May?
> >
> > Grigore
> >
> > On Sat, 11 Feb 2006, Scott Derrick wrote:
> >
> >> The structural adhesive is probably an epoxy.
> >>
> >> whether it is or not, it does have a minimum temp and
> curing time on
> >> it. If not contact the manufacturer.
> >>
> >> Scott
> >>
> >> Grigore Rosu wrote:
> >>> Is structural adhesive sensitive to low temperature? I
> know epoxy
> >>> is ...
> >>>
> >>> I'd like to permanently fix the keen fin and we have about 45
> >>> degrees here in Illinois now. I ordered a heater and a
> highpower
> >>> lamp to warm the epoxy, but they have not arrived yet.
> >>>
> >>> Thanks,
> >>> Grigore
> >>>
> >>>
> >>> On Fri, 10 Feb 2006, John Overman wrote:
> >>>
> >>>>
> >>>> Hiroo;
> >>>> There is a Pilot here at Port Angeles named Mel
> >>>> Rudin. He bought a Velocity RG and took a CFI with him
> >>>> to the factory to get checked out in the Velocity so
> >>>> he could check Mel out. The CFI is named Fred but I
> >>>> can't think of his last name. The instructor is also a
> >>>> pilot for Horizon Airlines. He is a really nice guy
> >>>> and thorough. I got my instrument rating from him but
> >>>> his last name won't materialize. Anyway Mel should be
> >>>> in the phone book. Tried looking in my log book but he
> >>>> should have been a doctor the way he scratched out his
> >>>> signature. I can read his CFI number if that helps. If
> >>>> you can't track him down let me know.
> >>>> --- Hiroo Umeno <humeno at microsoft.com> wrote:
> >>>>
> >>>>> I am sure this has come up before but...
> >>>>>
> >>>>>
> >>>>>
> >>>>> Are there any Velocity qualified CFI on the West
> >>>>> Coast who can give
> >>>>> transition training? It looks like my engine is
> >>>>
> >>>>>
> >>>>>
> >>>>> Does anyone know of someone?
> >>>>>
> >>>>>
> >>>>>
> >>>>> Hiroo
> >>>>>
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