Today's Message Index:
----------------------
1. 08:12 AM - Re: Post curing response (flyingphil2)
2. 08:27 AM - Re: Re: Post curing response (Pete)
3. 02:04 PM - Re: Re: Post curing response (Bud Yerly)
4. 02:20 PM - Re: Post curing response (flyingphil2)
5. 02:49 PM - Re: Re: Post curing response (Pete)
6. 03:18 PM - Re: Re: Post curing response (Bud Yerly)
7. 07:00 PM - Re: Post curing response (rparigoris)
Message 1
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Subject: | Re: Post curing response |
Tony, just out of interest, when were the control surfaces laid up?
I remember having a conversation with Andy Draper about this and I've just read
the Gurit 'Guide to Composites'. As I understand it, post curing is only necessary
if you are in a rush and want to crack on with the build. Otherwise you
have to wait but the resin will eventually go off at room temperature and according
to the Gurit document that may take 'several hours or even days at room
temperature'. If your control surfaces were built more than a few weeks ago
then I believe you can assume the resin is cured if it was mixed correctly.
Have I understood that correctly? I have some control surfaces in my possession
that were laid up in 2001. They've not been post cured but I'm pretty sure
the resin has cured after 19 years!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496545#496545
Message 2
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Subject: | Re: Post curing response |
Fwiw, It was my understanding that a post cure raised the Tg (glass transition
temp, when it gets soft and expands) of the finished product.
Cheers,
Pete
> On May 28, 2020, at 11:22 AM, flyingphil2 <philipjtiller@gmail.com> wrote:
>
>
> Tony, just out of interest, when were the control surfaces laid up?
>
> I remember having a conversation with Andy Draper about this and I've just read
the Gurit 'Guide to Composites'. As I understand it, post curing is only necessary
if you are in a rush and want to crack on with the build. Otherwise
you have to wait but the resin will eventually go off at room temperature and
according to the Gurit document that may take 'several hours or even days at room
temperature'. If your control surfaces were built more than a few weeks ago
then I believe you can assume the resin is cured if it was mixed correctly.
>
> Have I understood that correctly? I have some control surfaces in my possession
that were laid up in 2001. They've not been post cured but I'm pretty sure
the resin has cured after 19 years!
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=496545#496545
>
>
>
>
>
>
>
>
>
Message 3
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Subject: | Re: Post curing response |
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Message 4
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Subject: | Re: Post curing response |
Ah!
So does it mean that the 'Tg' is essentially room temperature unless you post cure
it and raise it to a higher figure?
Does that also mean that unused control surfaces that are 19 years old should still
be post cured then?
How many builders did this? There's no mention of post curing in the build handbook
is there?
Thanks,
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496553#496553
Message 5
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Subject: | Re: Post curing response |
No, tg is in the lower hundreds from a room temp cure typically. Post curing typically
raises it some 10s of degrees. So its not mandatory, but does help somewhat
in hot climates.
Best to reference the epoxy spec sheets for specifics.
Cheers,
Pete
> On May 28, 2020, at 5:30 PM, flyingphil2 <philipjtiller@gmail.com> wrote:
>
>
> Ah!
> So does it mean that the 'Tg' is essentially room temperature unless you post
cure it and raise it to a higher figure?
>
> Does that also mean that unused control surfaces that are 19 years old should
still be post cured then?
>
> How many builders did this? There's no mention of post curing in the build handbook
is there?
>
> Thanks,
> Phil
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=496553#496553
>
>
>
>
>
>
>
>
>
Message 6
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Subject: | Re: Post curing response |
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Subject: | Re: Post curing response |
Hi Group Here's some things Aeropoxy has to say about their Epoxy:
https://www.ptm-w.com/aeropoxy/aeropoxy-faq.html#14
and another:
https://www.ptm-w.com/aeropoxy/AEROPOXY%20Product%20Bulletins/AEROPOXY%20PR2032%20Bulletin%20w-4%20Hardeners%2024Jun08.pdf
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496562#496562
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