Subject: Re: {Disarmed} Re: [harryproa] Re:: Infusion epoxy
From: "=?UTF-8?B?QmrDtnJu?= bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 8/24/2018, 11:05 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

It seems like some terms (pot life, working life) are a bit fuzzy. I have been reading quite a few datasheets now, and some manufacturers have a large ratio been potlife and working life. Example: maybe 0.5hour potlife, 2 hours worklife, 3 hours geltime. Others have lets say 1,5 hours potlife, 2.5 hours worklife, and 3 hours geltime. I'm guessing that both epoxies might behave pretty much the same, it's just that they have different ways to define the first two stages. But that is just a guess.

Your epoxy looks very good!

I have this product, but I haven't tried an infusion with it:
http://www.nilsmalmgren..se/Datablad/TDS%20S%20NM%20Infusion%20665.pdf
The datasheet has a graph of how the viscosity changes with time.
I payed about 50 usd per litre for my 1.4 litres!

I've also been looking at this, which is cheaper:

Regarding the "infusability comparison number" that I mentioned, it should of course be the ratio of potlife and viscosity. (not the product!)

Let's calculate the  "infusability comparison number"  for these products:

BAKELITE® EPR 04908
5 hours / 0.13 Pas = 40

NM Infusion 665
3 hours / 0.28 Pas = 10

R&G Epoxy Resin L + Hardener GL 2
3.5 hours / 0.25 Pas = 14

EP45 (The eBay stuff)
1 hour / 0.5 Pas (? no data) = 2

So if I try infusing again with NM Infusion 665, it seems like I have a 5x better chance to succeed, at least. =)
And it looks like the Swiss product is of exceptional quality, just like you would expect!

On Fri, Aug 24, 2018 at 2:37 PM, Fram henny@fram.nl [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

A resin that starts to cure during the infusion is killing the composite part you are making. So for infusing you need a very slow hardener. As I've said in a previous post, in my case gelling starts only after about 8 hours or a bit sooner when temperature is more than 20 degr.C

Do not compare these resins with hand-lay-up resins. Total different animal...

> Op 24 aug. 2018 om 13:15 heeft Björn bjornmail@gmail.com [harryproa] <harryproa@yahoogroups.com.au> het volgende geschreven:
>
> Thanks, but I was looking for Mr. Fram's explanation/reasoning. Because as I per my message, my experience is that the viscosity gets too high to be usable (for hand layup) just slightly after passing potlife. So it seems to be an exponential process. Which I think most chemical reactions are.
>


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