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wdaniell.longport(at)gmai
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 Posted: Fri Apr 17, 2020 2:11 pm Post subject: Its so long since I bought Araldite /Epibond 420 |
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So I am going to mod my wheel pants according to buds plans. One of the things about moving from Colombia is that I left behind stuff a ton of really useful stuff....like out of date araldite.
And now I see its about USD500 for a quart kit. I used my out of date Araldite for bonding nut-plate riveted to aluminium backing plates to composite (if that makes sense - as opposed to riveting nut plates to composite.)
Does any one have an alternative to araldite which is easier to obtain (in the USA) and cheaper for
- Non structural like the above
- Structural - for future reference. (Didn't someone on the forum mention that they had used aeropoxy adhesive instead of Araldite??)
thanks - Will
William Daniell
LONGPORT
+1 786 878 0246
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budyerly@msn.com
Joined: 05 Oct 2019
Posts: 288
Location: Florida USA
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| Posted: Fri Apr 17, 2020 6:32 pm Post subject: Re: Its so long since I bought Araldite /Epibond 420 |
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Will,
Contact me off line. For my wheel pant mod, it can be done without Epibond 420 A/B.
I used to be able to get 420 A/B from distributors that had near expiration or just expired cans. Shelf life even unopened is six months. Obviously, it is longer than that.
Best Regards,
Bud Yerly
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n7188u
Joined: 15 Nov 2015
Posts: 404
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| Posted: Sat Apr 18, 2020 4:33 pm Post subject: Re: Its so long since I bought Araldite /Epibond 420 |
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Daniel,
A couple of years ago I found out Aeropoxy supplies the adhesives used to manufacture the Cirrus so I had a conversation with them since I wanted an alternative to 420 (because the price was outrageous). They recommended one of their structural toughened epoxies adhesives which is equivalent to that used to manufacture the Cirrus. Equivalent because the PN of the stuff used in the Cirrus comes in drums and the one I got you can buy a quart but same epoxy according to them. I ended up using the 420 for critical structural stuff and the aeropoxy for not so critical items. The stuff is great, easy to work with and I did pull and impact test on our planes substrates and its tough stuff. Heck, if it’s good for closing the wings in the Cirrus it should be ok for non ultra critical stuff (actually in my opinion it’s as good as 420). It is much much less expensive than 420.
I can get you the number once I get to my hangar. BTW, usual disclaimer: I’m not claiming it’s good for your application. Use at your own risk. But I like it and you don’t have to be Boeing to buy it 
Chris
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n7188u
Joined: 15 Nov 2015
Posts: 404
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| Posted: Sat Apr 18, 2020 6:09 pm Post subject: Re: Its so long since I bought Araldite /Epibond 420 |
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The Aeropoxy PN is ES6240.
One warning I make about this epoxy is that it is white and the hardener is clear which means that when you mix it you really can't see if it got mixed properly by it's color (or looks). I had no issues with this since I am very methodical about measuring and mixing the epoxy. I always use a timer and mix for 3 minutes ensuring I scrape walls, bottom corners, etc. It always cured properly so no issue with that but be warned that its color is a bit disconcerting.
It is a bit thicker than 420 but mixes well with flox.
I paid around $70 per quart kit a couple of years ago and bought directly from PTM&W. As I mentioned, I was told by PTM&W this epoxy is equivalent to that used in the Cirrus airplane for structural bonding.
Again, if you decide to use it please do so at your own risk but I found it to be a good alternative for items such as the spar cups, bedding for bonding LG frame to CM, phenolic guides, etc. I still used 420 for items such as fuselage bonding, wing skin, stab bearings, tailpost, CM bonding, etc. Using the ES6240 for other not so critical areas allowed me to ensure I would have enough 420 for the critical ones since I had no intention of buying 420 for the price they want for it these days.
Chris
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