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Glaze Amounts


bhunt7

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I'm sure you all know this off the top of your heads, but I'm doing some calculations of batch sizes, costs, etc. Please fill in blanks for this newbie: What are quantity batches in relation to cups, or pail sizes? ie. 3,000 gram batch is 2 gal pail or gallons? 5,000 gram batch/half a 5 gal pail, 10,000, 12,000 and so on.

 

I tried to add my worksheet that calcs all the chemical qty's for different batch sizes for your review/comments but the system won't let me.

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It will depend on the volume that some glaze chemicals take up, and how much water you need in a given glaze. Some are denser than others but as a *generality*

100g test -some kind of plastic drinking cup

500g large yoghurt tub (in North America)

1000g (1kg) 1 gallon pail (ice cream pail)

5000g (5kg) 3 gallon pail

8000g (8 kg) 5 gallon pail - this is where volume and weight differences become glaring. You still need room in the pail to mix.

 

Anything above this you get to figure out your own, as you should have enough practice with your glaze to know how much space it is likely to take up, and how much of it you need.

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It really depends on the materials. I can get 8000 grams of certain chemicals with water for a ^6 glaze into a 5 gallon bucket. When I mix a majolica Glaze like Seibert's Majolica, I can get 10,000 grams with water into a 5 gallon bucket. The difference is in the density of the materials. Frits are denser than air floated chemicals.

Do a visual test with some of your chemicals to see this difference. 

say weigh out 100 grams of silica and compare to 100 grams of ball clay, talc, magnesium carbonate.

You will see a difference in mass.

 

Generally, I put 1500 gram mixes in a 2 gallon bucket. 8000 in a 5 gallon. It depends also on what you'll be dipping. Remember Euclid's theory of mass displacement. If you dip the bottom of a pitcher over halfway up, the glaze could over flow the bucket.

 

Marcia

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