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Anyone who can spare a small sample of Araldite 420?

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hagargs(at)earthlink.net
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Posted: Wed Nov 06, 2013 3:11 pm Post subject: Anyone who can spare a small sample of Araldite 420?

Andrew:



You shouldn't need to do comparison testing.  When doing tensile testing your joint should not fail at the adhesive. Your sample coupon should fail at the base material. Make your coupon out of the requisite number of fiberglass layers. You  want to ensure your adhesive is stronger than the material you are gluing together.  I've done tensile tests on my old adhesive and always had the fiberglass break before the adhesive gave way.



Steve Hagar.



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nigel_graham(at)m-tecque.
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Posted: Thu Nov 07, 2013 6:03 am Post subject: Anyone who can spare a small sample of Araldite 420?

Andrew,           

            

I read your post with         interest as I have pondered the same question.           

I bought my first kit in         1994. It was supplied with two cans of Redux, one of which I         opened and began using until the project ground to a halt (like         so many), the other remained sealed.            

Long after the “use-by”         date, I resumed construction and mindful of the age of the Redux         but curios as to how it degraded with time, I contacted         Ciba-Geigy and was lucky enough to be able to speak to one of         their research chemists.            

Refreshingly         honest, he assured me that both resin and hardener are totally         inert and very stable and that, in theory, it would not degrade         over time. When I asked why they advised a 36 month “use by”         shelf-life, he answered that as epoxies were relatively         “modern”, there was no historical evidence of any degradation         and that it was only added to placate various regulating         authorities.  He did         warn that the yellow resin would most likely crystallize over         time, but that chemically it was unaltered and a gentle warming         in a water bath would restore it to its original liquid state         (the opened can subsequently did, as predicted, and was restored         exactly as advised).           

            

Returning to my two original         cans, both had a use-by date of October 1998 – I still have them         and continue to use them today, 18 years after manufacture. It         works perfectly.           

            

This also remains true of         other epoxies. My SP Systems Ampreg 20 still performs perfectly         (expiry 1999) and my super-expensive Polyfibre “Super-Fill”         works perfectly too (expiry 1999).           

            

Before the finger wagging         begins, I should explain that I acquired the mortal remains of a         cart-wheeled Europa to allow me to develop repair strategies for         the compression fractured ailerons, flaps and tail. – The         time-ex’d epoxy was used on these. The resulting components are         indistinguishable from new-build parts. I keep test samples of         each resin mix in clear plastic egg-boxes, with encapsulated         paper slips listing date, batch no and component-used-on in each         compartment for trace-ability.            

            

Here is a link to the Redux         (Araldite) 420 data sheet listing the target peel strength test         figures:           

            

http://www.ambercomposites.com/downloads/datasheet/araldite-420-tds-v1.pdf           

            

atb           

            

Nigel

         

                                     Normal   0      <![endif]-->            On 06/11/2013 17:54, Andrew Sarangan       wrote:

     

     

     [quote]        	  Quote: 	
		  

Snip .....I am hoping someone can send me a small sample of unexpired Araldite

420 for comparative testing.

	
     [b]

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