Help figuring out casting ratio.
in Lab work
I'm going to be casting something in smooth-on flexfoam-it IV. It has an 80a to 100b mixing ratio. So 5:4. I need to have a total of 700g of pourible material. I'm sure it's something obvious but I can't figure out how many grams of each I need to pour. If I just try to top off the difference like doing the 80% of 350g first then I will end up with having to do 120% of the other part to reach 700g again. This doesn't seem right... than you for any help.
1
Best Answers
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Kai Rottmann
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Hey Tanuki :-)
You could make 4 batches with 80g a and 100g b (4 x 180g= 720g) or 320g a and 400g b and you have an overflow of about 20 grams.
I think you can live with that overflow. Its better than headache while throwing away the calculator, hihi.
*smokingheadgreetings*
Kai5 -
Chris Ellerby
Admin
Smooth-On has a great calculator to help with this. You'll find it at the bottom of this page under "By Weight Mix Ratio"
https://www.smooth-on.com/support/calculators/
To get 700g using the FlexFoam-iT! IV ratio you would neeD:
311.11 g A : 388.89 g B
Always mix up more than you need, as some sticks to the container, funnel, etc. Better to have a bit extra than not have enough.
/Chris6 -
take your ratio numbers, 4:5 or 5: 4, doesn't matter. make a fraction out of them by finding the denominator that will help find the whole. 4+5 = 9.
4/9 + 5/9 = 9/9 or 1. The 700 grams would be your 1. so, 4/9 x 700=311.111111111 and 5/9 x 700= 388.888888889 add the two together and you get 700 grams. Easy breezy!!1
