# Volume Calculator:
[ Use inches for
all measurements, use IE or Firefox browsers]
# Formulas for Manually Calculating Volume:
# Amount
of RTV Needed for Making a Silicone Rubber Mold
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**Note: There are 21 grams per cubic
inch of Silicone Rubber.**
**There are 453 grams in 1lb.**
**Formula for a Square/Rectangle Mold: **Length x
Width x Height
Example: You have a mold box that needs to be filled up 9" x
4" x 2" =
72 cubic inches in order to completly cover your original/part.
Now using the same formula subtract the cubic inches (volume) of your part.
Example: Your part is 8" x 3.5" x 1.5" = 42 cubic inches.
Then you would take 72 - 42 to give you a total of 30 cubic inches.
30 cubic inches x 21 grams per cubic inch = 630 grams of RTV needed.
And then if you want to calculate that into lbs. take 630 divided by 453 grams
per lb. = 1.39 lbs. of RTV.
**Formula for a Round Mold: **Pi x Radius (squared) x Height
Example: The diameter of a mold is 4" (the radius would then be half of
that being 2") and the height is 3".
So this is what it would look like:
2" x 2" (radius squared) x 3.14 (pi) x 3 (height) = 37.68 cubic inches.
Now using the same formula subtract the cubic inches of your part.
Example: The part is 3.5" diameter (1.75" radius) by 2.75" high.
So this is what it would look like:
1.75" x 1.75" (radius squared) x 3.14 (pi) x 2.75" (height) =
26.45 cubic inches.
Then you would take 37.68 - 26.45 to give you a total of 11.23 cubic inches.
11.23 cubic inches x 21 grams per cubic inch = 236 grams of RTV needed.
And then if you want to calculate that into lbs. take 236 divided by 453 grams
per lb. = .52 lbs. of RTV.
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# Amount of Resin Needed to Cast a Part
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Note: There is .554 ounces in 1 cubic inch of
Alumilite Resin.
**Formula for a Square/Rectangular
Piece:** Length
x Width x Height
Example: If your piece is 3" x 4" x
2" = 24 cubic inches. Take 24 cubic inches x .554 ounces
per cubic inch = 13.25 ounces.
**Formula for a Round Piece:** Pi
x Radius (squared) x Height.
Use the same formula as the RTV round mold (section
1) to calculate resin needed. Then multiply that by .554 ounces
per cubic inch to determine ounces needed.
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