I need an alumite Refresher

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RyanNJ

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Joined
Jan 31, 2010
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Location
Burlington, New Jersey
I last poured about a year ago and i can not find a red/white/blue blank that i like as a result i decided that i will pour my own. I mixed up the colors in three different cups, The white went from liquid to hard in a flash so that was virtually un useable and i when i tried to swirl the red and blue it combined

I need someone to remind me on how much i need to fill a mold i remember the number .554 for some reason.
How long do i need to pressure it
what is the order i should mix the colors, blue then red and white last because it sets faster?

Any other things that i might have forgotten a reminder would be greatly appreciated
 
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White always goes fastest for me too, so i mix it last. All the colors need to be starting to flash off when poured if you want to keep good color separations. I have no idea how big your molds are. A 7/8 square by 5.25 long mold uses about 3.4 ounces of alumilite measured by weight.
 
workinforwood said:
.... A 7/8 square by 5.25 long mold uses about 3.4 ounces of alumilite measured by weight.
Click to expand...

that's where I am also... I use 9 1/2 oz A&B mixed plus 1 oz for the contrast color for 3 blanks in the same size mold...10 1/2 oz total for the 3. I'm a math guy so the .554 is confusing me as well....help!
 
GoodTurns said:
workinforwood said:
.... A 7/8 square by 5.25 long mold uses about 3.4 ounces of alumilite measured by weight.
Click to expand...

that's where I am also... I use 9 1/2 oz A&B mixed plus 1 oz for the contrast color for 3 blanks in the same size mold...10 1/2 oz total for the 3. I'm a math guy so the .554 is confusing me as well....help!
Click to expand...


I assume .554 is the number that converts the volume into weight for measurement purposes.
 
This formula is directly from Alumilite's website. They even have a place where you can input your numbers and it will spit out how much resin you need. http://alumilite.com/CalcVolume.cfm . Of course this is a conversion of FLUID ounces, not dry ounces. However, Alumilite Clear has a specific gravity of 1.05 which means it weighs real close to the weight of water. Water weighs 1.043 dry ounces per fluid ounce and a chemist friend of mine THINKS that you can multiply the dry ounce weight of water by the specific gravity of Alumilite to come up with a dry ounce weight per fluid ounce of Alumilite of 1.0952 dry ounce weight per fluid ounce of Alumilite. Therefore, if his recollection is correct, the formula above needs to be corrected slightly by the following formula: length x width x height x .554 x 1.0952. This, of course, assumes that his recollection of obtaining the fluid ounce to dry ounce conversion is correct!
 
I'm no genious either but I can use a calculator and even when adding the 1.09 makes no difference its way off. I do pour excess for trimming but I've been pouring same size molds so long I've got it like a science and my overpour is as minimal as possible. Their chart is wrong. I have a piece paper on wall where I documented how much fills what mold. If however alumilite is .09 heavier than water, should be able to just fill mold with water, empty water to weigh then add a 1/2 ounce for good measure, pour and make adjustments from there.
 
workinforwood said:
I'm no genious either but I can use a calculator and even when adding the 1.09 makes no difference its way off. I do pour excess for trimming but I've been pouring same size molds so long I've got it like a science and my overpour is as minimal as possible. Their chart is wrong. I have a piece paper on wall where I documented how much fills what mold. If however alumilite is .09 heavier than water, should be able to just fill mold with water, empty water to weigh then add a 1/2 ounce for good measure, pour and make adjustments from there.
Click to expand...

Jeff,

I have had the same problem with my Square Blank mold. I measured by weight which takes approx 3.25 oz of resin. If you measure by volume which is what the Alumilite site uses, it only takes about 2.25 fl. oz.

The Alumilite site is measuring in fl. oz where you are measuring by weight. That is where the differences come from...There is a conversion but I don't know what it is.
 
oh, well that makes sense Fred. I measure by weight, not volume. The instructions for the product are to measure by weight not volume. 3.25 - 3.4 would be right on weight wise, with a little excess left over to trim the blank square and pretty.
 
why not just weigh a completed blank. That's how much alumilite you need to make it... It wont change weight when it cures....honest...

Tom
 
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