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Old 09-09-2018, 09:13 PM   #1 (permalink)
 
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Default Liquid Diamonds Changing Mix Ratio

From the previous items we posted under our Novice Trials of Liquid Diamonds, Chuck (dalecamino) and I did not like the long time required for LD blanks to actually cure hard enough to turn and polish.

We had learned that Aldax Enterprises a Liquid Diamonds vendor in New South Wales states on their website,
“This product can be mixed at a ratio of 65% hardener. This will create a super clear bubble free finish. Mixing by weight (100:65 resin/hardener). Your pieces will cure faster, harder, and have less bubbles than the 2-1 mixture. This mixing procedure is not recommended on large pieces above 2”.

So, with Chucks approval (since he brought the Liquid Diamonds to my shop) I decided to run a test and see how changing the mix ratio between parts A and B affected the cure of the blanks.

I picked 4 ratios, the original 2:1, 1.8:1, 1.7:1 and 1.54:1 to see what the result was.
img_0578.jpg
One of each ratio was mixed and poured into each of the 4 voids of a 4 blank mold.

They were placed in a pot under 60psig and left for 22 hours (no reason for 22, that just happened to be when I got back to the shop. At that point they were removed from the pot and the mold. (Mold had been sprayed with Stoner Thermoset Epoxy Mold Release)
img_0579.jpg
They all looked good and were pliable, which we know is normal for Liquid Diamonds out of the pot. I checked each with my 2.5 pound weight to see how much they would sag under the weight right out of the pot:
img_0584.jpg
The standard 2:1 ratio
img_0583.jpg
A ratio of 1.8:1
img_0582.jpg
Ratio of 1.7:1
img_0581.jpg
The ratio of 1.54:1

There was some difference between the 2.0:1 and 1.8:1 but you can see the greater difference at 1.7:1. With my crude methods, there didn’t seem to be a lot of difference between the 1.7:1 and the 1.54:1.

I think the biggest difference shows up a day later.
img_0589.jpg
img_0590.jpg
img_0591.jpg
img_0592.jpg
From fiddling around with the blanks, bending, squeezing, pinching, marking, it appears that for this test the 1.7:1 ratio produces in 24 hours out of the pot a blank that has very, very similar properties of the blank from the earlier test at 6 days out of the pot.

Here is that blank under the weight at 6 days for comparison:
img_0593.jpg
Obviously results may vary based on your temperatures, humidity, etc. I think the key is that if you do like/want to use Liquid Diamonds and don’t want to wait “4 or 5 days” before it is completely cured, you can modify the ratio to increase the hardener and thereby decrease the cure time.

Doesn’t take much and see what works best for you.

- Happy Turning!


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Last edited by MRDucks2; 09-09-2018 at 09:18 PM.
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Old 09-09-2018, 09:21 PM   #2 (permalink)
 
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Nice experiment! Thanks
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Old 09-09-2018, 09:45 PM   #3 (permalink)
 
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Mike, thats great info!! This should go in Library!
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Old 09-09-2018, 10:54 PM   #4 (permalink)
 
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Awesome Mike! You have much more ambition than I do. Well done. I am waiting for the original cast blanks to pass the nail test, and the mood hits me, before I turn anymore of them.
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Old 09-09-2018, 10:56 PM   #5 (permalink)
 
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Thanks for sharing this with us .... very interesting !
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Old 09-10-2018, 09:34 AM   #6 (permalink)
 
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This is fantastic information. (I especially like the "Official Cord Wood Test!") Your efforts are going to make my life easier - thanks for sharing.
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Old 09-10-2018, 11:13 AM   #7 (permalink)
 
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"Seeing" often beats "Reading/Hearing."

Great process.
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Old 09-10-2018, 11:33 AM   #8 (permalink)
 
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I'd be interested in your impressions of how the higher ratio resin/hardener blanks turn and finish compared to the normal recommended mix. Harder? More/less/same brittleness? How it polishes et cetera. Thanks.
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Old 09-10-2018, 12:14 PM   #9 (permalink)
 
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Quote:
Originally Posted by Curly View Post
I'd be interested in your impressions of how the higher ratio resin/hardener blanks turn and finish compared to the normal recommended mix. Harder? More/less/same brittleness? How it polishes et cetera. Thanks.


Thanks, Curly. That is a natural next step and will be coming up later in the week.


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Old 09-11-2018, 07:17 AM   #10 (permalink)
 
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Interesting results. However you do not need to change the ratio to improve cure times. It’s certainly viable to do that with the standard ratio mix.
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