Epoxy Curiosity

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Rover1
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Epoxy Curiosity

Post by Rover1 »

I have noticed this for some time and with a couple of different brands of epoxy.
Ordinarally, you mix straight epoxy and depending on temperature you have roughly 20-30 minutes working time. hardens 2-4 hours
When you add wood flour to the epoxy the hardening time is greatly extended. in this case still pliable the next morning, Could still deform with my finger. The exothermic reaction does take longer to start
Have others noticed this and does anyone have a basic explanation?
Does not appear to affect the final strength in any way.
Just curious
Rover1



OneWayTraffic
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Re: Epoxy Curiosity

Post by OneWayTraffic »

Assuming that mix proportions are correct etc. Fillers can speed up or slow down cure times depending on how they interact with the heat produced by the epoxy.

fallguy1000
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Re: Epoxy Curiosity

Post by fallguy1000 »

Rover1 wrote: Sun Aug 02, 2020 7:56 pm I have noticed this for some time and with a couple of different brands of epoxy.
Ordinarally, you mix straight epoxy and depending on temperature you have roughly 20-30 minutes working time. hardens 2-4 hours
When you add wood flour to the epoxy the hardening time is greatly extended. in this case still pliable the next morning, Could still deform with my finger. The exothermic reaction does take longer to start
Have others noticed this and does anyone have a basic explanation?
Does not appear to affect the final strength in any way.
Just curious
Rover1
Generally, a low ratio filler mix kicks faster. A high ratio that is really high would behave as you say and have lower strength attributes.
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Rover1
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Re: Epoxy Curiosity

Post by Rover1 »

Thank Guys
like i said just curios. it is interesting to see various reaction times.
Rover1

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