REFLECTOR: structural adhesive in low temperature

[Scott Derrick]

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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> _______________________________________________
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