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Determining the Amount of Glass

Needed for Kiln Casting

This is part two of a multi-part tip on ways to determine the amount of glass needed when kiln casting.  Click here to go to the first section of the tip.

The water displacement method

In addition to the prepared mold and the glass cullet or frit, this method requires water and a bucket.

1.  Fill the bucket with water.

2.  Mark the level of the water on the outside of the bucket.

3.  Pour water from the bucket into the mold cavity.  You should work quickly, so that the water doesn't seep into the mold material.

4.  Once the mold is full, remove the water.  This may be discarded.

5.  Refill the bucket (which should still contain the water which was not poured into the mold) with your glass cullet or frit until the water level rises to the mark on the side of the bucket (the mark you made in step 2).

6.  The amount of glass required to raise the water level is also the amount it will take to fill the mold.  So simply remove the glass from the bucket, fill the mold, and fire as normal.

7.  If desired, you can allow the glass and mold to dry before firing. 

Click here to read about the specific gravity method of calculating how much glass your mold will require.


Copyright 2005 Brad Walker.  All rights reserved.

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Copyright 2005-2006 by M. Bradley Walker.  All rights reserved.

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