| Epoxy hardener expiration ? #158285 10/26/08 08:00 AM 10/26/08 08:00 AM |
Joined: Oct 2007 Posts: 199 Constanta, Romania isvflorin OP
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Posts: 199 Constanta, Romania | I hope the guys with more experience can help out with a bit of advice regarding hardener properties, or any chemist around ?
I got the hardener in a plastic container and realized that the cap cracked from overtightning. I probably realized this too late, fixed the cap but the hardener turned somewhat redish, darker colour.
Question - what does this to the chemical properties ? It probably reacted with air - but in a half full airtight container there is still air right, but does not necessarily turn darker.
The hardener seems to work the same way (subjective opinion- don't know if the mechanical properties actually changed).
Supplier has no idea about this.
Opinions ? Is it safe to use it ?
Regards,
Florin
| | | Re: Epoxy hardener expiration ?
[Re: Kevin Cook]
#158310 10/26/08 05:19 PM 10/26/08 05:19 PM |
Joined: Oct 2007 Posts: 199 Constanta, Romania isvflorin OP
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Posts: 199 Constanta, Romania | Kevin, The resin system comes from Bostik/Resoltech, called Epiphene RE4020, hardener DE 4020. I think I remember the hardener is based on modified aliphatic amines. Should have mentioned this earlier. The hardener is a bit yellowish from the start, but that container turned darker, a bit redish.
Regards,
Florin
| | | Re: Epoxy hardener expiration ?
[Re: isvflorin]
#158402 10/27/08 06:49 PM 10/27/08 06:49 PM |
Joined: Jun 2001 Posts: 115 Kevin Cook
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Posts: 115 | I'm looking at an industrial formulator's catalog (magnolia plastics, www.magnaepoxy.com). Their Modified Aliphatic Amine is a general room temp fast cure hardner. Their comments: "accelerated reactivity", "fast cure in thin sections", "fast cure low viscosity". They offer the folllowing general note:"Unsealed containers of each component will allow the component to absorb moister form the air - especially the hardner. Extensive water absorption by the components will alter the chemistry of the reaction and change the properties of the cured materials". Hope this helps! | | | Re: Epoxy hardener expiration ?
[Re: Kevin Cook]
#158424 10/28/08 03:34 AM 10/28/08 03:34 AM |
Joined: Oct 2007 Posts: 199 Constanta, Romania isvflorin OP
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Posts: 199 Constanta, Romania | Thanks guys,
I guess the contaminated hardener should be ok for making non structural fillings.
Regards,
Last edited by isvflorin; 10/28/08 02:55 PM.
Florin
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