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calculating the amount of glass for a mold

For discussion of processes related to using Bullseye glass, including kilnforming and kilncasting, torchwork, blowing and stained glass.

calculating the amount of glass for a mold

Postby ruthysuss » Thu Mar 12, 2020 12:29 pm

Hi, I am thinking of buying a small female torso mold but have no idea of how much glass to put in, or to use either frit, ( coarse, medium or fine? ) or small glass pieces. Is there a way of calculating this?
Thank you.
ruthysuss
 
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Re: calculating the amount of glass for a mold

Postby mattt » Sun Jan 31, 2021 11:14 am

The easy way to work out how much glass to put into a mould is to measure the volume of the mould. (Tip: whether you normally work in litres or pints, this is MUCH easier of you work in litres.)

Fill the mould with water, from a jug, so that you can record how many litres it takes.
OR: put the mould on some scales. Zero the scales, then fill the mould with water. The mass (weight) of water in kilograms is equal to the number of litres that the mould holds.

Multiply the volume in litres by 2.5 (the density of Bullseye glass) to give the number of kilogrammes of glass needed. This weight of glass will be the same whether you're using frit, sheet glass, casting cullet or billets (but frit will take up a lot more space).
mattt
 
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