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Author Topic: 15 min epoxy  (Read 1739 times)

Corposant

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15 min epoxy
« on: October 23, 2010, 12:32:59 PM »

When I started to build my puffer (3 years ago!), I bought some Loctite "Super Epoxy" which looked as if it would "go off" at a reasonable rate for my purposes. I was very satisfied with it in practice but when I ran out a few months ago, I found it was no longer on the market. Having studied the expertise available on the forum, I decided that Devcon 2 ton probably goes off at the same sort of rate - which it does.

I bought 50ml from Farnell at what appeared to be a good price - but discovered the other day, when I came to use it, the reason it was cheap. It was a replacement cartridge designed to fit in a dispenser! The dispenser is expensive so a couple a bits cut off the ends of some curtain rail came in handy. (I hadn't thrown them away in case they came in handy!!)





Now for my question!

When I replaced the propshaft recently, I noticed that the Loctite epoxy was still resilient (after 3 years). It looks as if the Devcon  is going to behave in just the same way. Is this true of all "rapid 2 part epoxys"? This is probably no bad thing for model boats but the original Araldite used to set really hard (and presumably still does!).

Mike
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derekwarner

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Re: 15 min epoxy
« Reply #1 on: October 23, 2010, 12:46:36 PM »

Mike asks...."It looks as if the Devcon  is going to behave in just the same way. Is this true of all "rapid 2 part epoxys"? ..... {-) - I would equate this to 5 minute rolled oats in the microwave....or the original  :-)) 30 minutes on the stove top  ...I know which one tastes better  :kiss:

I am not a big fan of 5 minute epoxies...or cyro....super glues........PVA is OK for wood but not a good as West Systems marine epoxies.....but remember in wood work 40 years ago we used ground up horses hoove glue in the glue pot?  <:( %% >:-o ....now that was a particularily strong water proof glue  :-X ......Derek


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Derek Warner

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Illawarra Live Steamers Co-op
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StarLocAdhesives/FiveStar

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Re: 15 min epoxy
« Reply #2 on: October 25, 2010, 09:32:49 AM »

A decent epoxy will remain slightly flexible, better ones are slightly more flexible than ones that are glass hard.

`Glass hard` ones are rubbish... and shouldnt be used for most things they have little or no impact resistance and very low sheer strength

The slightly flexible ones are are known as toughened the highly flexible ones as flexible , standard model trade epoxys the cheapo types of all speeds (especialy the std cheap epoxys sold for wing skinning) are more brittle and have no impact resistance, and in adhesive formulations have low sheer strength, a toughened one is always better than a hard one, even though a hard one may look like it will be stronger

Adhesives from decent manufacturers like our StarLoc and some Loctite epoxys have very high sheer strength, high tensile strength and great impact resistance due to the toughened formulation  

A lot of diy shop grades are just epoxy one one side and the hardener on the other, giving a harder set and far lower strength


 
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Corposant

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Re: 15 min epoxy
« Reply #3 on: October 25, 2010, 10:25:36 AM »

Thanks "Starlock" that's just the advice I was looking for. I'm greatly encouraged!

Mike
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nemesis

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Re: 15 min epoxy
« Reply #4 on: October 30, 2010, 09:29:36 PM »

Hi, One of the advantages of hoof & horn glues is that they are reversable, they were used extensively in the making of Bagpipes, glueing the mounts on the drones. If you broke a drone section you put it in hot water & then screwed it off.        Nemesis
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Corposant

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Re: 15 min epoxy
« Reply #5 on: October 30, 2010, 11:22:04 PM »

Thanks Nemesis - an interesting snippet! My dad used to do a fair amount of carpentry and it brings back boyhood memories of using the glue-pot (I'm 70, so we're talking a while ago!). I imagine that modern plastic drones are screwed in anyway.

I find PVA useful as timber joints can be separarated with the judicious use of acetone. One would need to be very careful using it on a model.

Mike
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nemesis

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Re: 15 min epoxy
« Reply #6 on: October 31, 2010, 04:56:12 PM »

Hi, If you have plastic drones I reckon they could be ornaments that you hang on a wall, bagpipe (Scottish)
drones are made of African Blackwood or Ebony, but the Blackwood gives a better Tone so you seldom see an Ebony set,  Nemesis










































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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Corposant

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Re: 15 min epoxy
« Reply #7 on: October 31, 2010, 05:25:10 PM »

Thanks again, Nemesis - my education another step nearer to completion!

Mike
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