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Post by Jake on Nov 4, 2016 11:23:45 GMT -5
I am using Amazing Clear casting resin, it says demold time is 24 hrs, however it seems to cure much faster in my pressure pot at 50 psi, what is an accurate demold time?
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Post by mike on Nov 7, 2016 11:47:39 GMT -5
Demold time really depends on the mass of the item you are pouring. If you are pouring a thin or small piece, yes 24 hours is a must. If you are pouring bigger pieces where there is more mass like blanks, yes ... the resin will generate more heat and cure much faster. Pressure has very little impact on the cure time but heat does ... whether it be internal from large masses or environmental ... cold or hot due to shop conditions.
Hope that helps, Mike
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Post by bailey3 on Dec 10, 2016 4:04:24 GMT -5
Yes, it will need 24 hours .
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Post by catspraise on May 6, 2018 22:04:16 GMT -5
Okay, I have a stupid question...I am fairly new to this. I will be using the Amazing Clear Cast resin. Does it have to stay in the pressure pot for the entire 24 hour curing period?
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Post by mike on May 7, 2018 6:35:14 GMT -5
Actually a very good question. Most likely the answer is ... no ... you do not need to leave it in the pressure pot for 24 hours. HOWEVER it all depends on the size and mass of the part you are casting as well as the temperature of your mold.
Bigger castings cure faster as they generate more exotherm (heat) when they cure and react/crosslink/harden faster. So if you are pouring a 6 oz casting that is fairly thick into a warm mold you've preheated, the material will generate enough heat to harden much more quickly than 24 hours. It may simply require overnight.
But lets take the opposite. Pouring a thin lens into a cold mold and the entire part is only 2 oz ... yes, it may need the full 24. We highly, when possible, to warm your mold to help create some of the initial exotherm and give the resin a conducive environment to start curing.
If you are using the Amazing Clear Cast for blanks, you may be able to reduce the time even less but it all depends on the size and mass of your part as well as the environment you pour it into.
Not pressurizing it long enough opens up the possibility for air bubbles to come back if the resin is not hard enough to keep them locked away in that dispersed state.
Last thing to add, you can not pressure it too long ... so as much as you'd like to cut down on the time, run tests until you find the right duration for your size of part and process.
Mike
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Post by Terri on Aug 22, 2021 6:51:06 GMT -5
When filling molds with resin how long do you have before putting it in the pressure cooker Example want to pour multiple different molds What happens if resin starts to harden can you still put it in pressure pot Thanks
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