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Old 11-13-2010, 08:49 PM   #1
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Epoxt strenght

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Hi Guys.

I have a question

is 30 min epoxy stronger then 5 min epoxy?
I thought the 39 just ment i had 30 min to work with it, and 5 ment 5 min. but alot of kits seem to call out for 30 min in areas such as wing attachments, where strength is desired.


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Old 11-13-2010, 09:02 PM   #2
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Re: Epoxt strenght

The longer it takes to set the stronger it is.

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Old 11-13-2010, 09:02 PM   #3
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Re: Epoxt strenght

YES - 30 min is stronger than 5 min
30 min means it will harden in 30 min.....5min means it will harden in 5 min. So working time will vary...the more you mix (volume) the faster it will set .
Working time with 30 min will not be 30 min as you do not want to be moving the join while it is setting...30 min is best for higher stress areas. With good 5min epoxy your working time will only be about 2-3min. I use 15min, 5min and 30min depending on what I am doing. Hope that helps.
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Old 11-13-2010, 09:08 PM   #4
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Re: Epoxt strenght

Generally speaking, the longer curing expoxies will be stronger. The faster an epoxy cures, the more brittle it tends to be, so 'weaker' it is. The 30 min and 5 min are times for the two kinds to set (in other words how long they should be clamped), their actual time to full-strength bond is a lot longer. Should say on the bottle.

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Old 11-13-2010, 09:11 PM   #5
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Re: Epoxt strenght

Hi C,

I'm not an expert in this area, but I'll give you my point of view.

I assume most epoxies are approximately the same strength. However, my choice when working with porous material, such as wood, leather etc. is to use a longer setting epoxy. The reason being is that the longer it takes to set, the longer time it has to be absorbed into the material before setting. The deeper it can be absorbed into the material before setting, the stronger the bonding will be.

When bonding a non-porous material, I have no problem using 5 min. epoxy, but I make sure both surfaces are "roughed up" so the epoxy has something to grip to.

I'm sure someone will have a proper technical explanation for you, but I hope this helps.


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Old 11-13-2010, 09:20 PM   #6
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Re: Epoxt strenght

Personally Wayne, I think you said that just perfectly! I wouldn't have explained it any other way.

When I use epoxy on a glow model to fuel proof the firewall, I actually use 1 hour epoxy for the very reason Wayne explained above. I do it when I know I won't be in too big of a hurry to go flying and allow it a good 24 hours to assure it is fully cured!
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Old 11-13-2010, 09:34 PM   #7
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Re: Epoxt strenght

If you thin the epoxy a touch with alcohol that also promotes wicking into wood.
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Old 11-14-2010, 10:49 AM   #8
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Re: Epoxt strenght

Thanks for the great information, as always i try to follow all instructions and often substitute 12min for 5min. The longer seeting for more porus materials also makes alot of sense.

Thanks again I'm hope others read this too, (even with the subject typo)
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