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Epoxy system preferences? |
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I luv Wight
Really should get out more Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628 |
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Topic: Epoxy system preferences? Posted: 09 Apr 14 at 8:39pm |
I do umpteen mixes in a week, and it's very very rare to get a soft cure - weighing - kitchen scales are good for mixes 30g - 2 kg. Pumps get gunked up, and don't measure accurately , so i use the big pumps for R and H just to get it out of the containers, but weigh everything.
e g for 320 - weigh resin , subtract 8g cup weight, times 4, divide by three, add 8g = weight target with hardener. I always have several kg of either resin or hardener left when it's time to buy more, so it's good to keep with the same system! I think west 105, SP106, sicomin 5500 are very similar. SP 320 is a bit thinner and flows better, maybe better properties. Fast cure even with slow H. Sicomin SR8500 is thicker but is good when vaccing, fast H is relatively slow, and has good performance when cured at ~ 60°C |
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alstorer
Really should get out more Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899 |
Post Options Quote Reply Posted: 09 Apr 14 at 9:46pm |
Looking up the MSDS , I see 320 has a Bis F epoxy component (can't hide everything in the formulation!) which would, to a certain extent, explain the higher performance and cost.
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Al |
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Oatsandbeans
Far too distracted from work Joined: 19 Sep 05 Location: United Kingdom Online Status: Offline Posts: 382 |
Post Options Quote Reply Posted: 10 Apr 14 at 5:29pm |
Yes its a real sod that you have to put all that stuff in the msds - it makes it easy for others to pick apart your systems without them even having to do any real chemistry,( like sticking it through the gc or ftir,) but then I have got quite a bit over the years from the msds 's of others, even though sometimes you suspect that they have the odd porkies in them!
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ChrisB14
Posting king Joined: 29 Oct 13 Location: London Online Status: Offline Posts: 101 |
Post Options Quote Reply Posted: 14 Apr 14 at 5:24pm |
Thanks for the tip Al: I have started looking over the MSDS to get a better idea of the different epoxy systems (of course following some background reading on the different components).
A fourth option I have come across is Mas Epoxy. Given the 2:1 mixing ratio I would suspect they are straightforward to use. Yet, they have not been mentioned in this thread.
That would also suggest it has a fairly short pot life even with a slow hardener? Or is it really just the final cure that is fast (I would expect the two to be linked)? Thanks for the patience with my newbie questions!
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B14 GBR 748 Bullet B
In build: Farr 3.7 GBR 410 (both sail number and the current number of loose parts) |
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