Virgin homemade clear batch melt
I thought I would try something simple for my first attempt at home batching so I went with the recipe Pete had published a while back:
28 Soda Ash
14 Lime Hydrate
12 Potassium Carbonate
200 grams potassium nitrate
100 grams antimony oxide.
I divided it by ten to get around 15 lbs. of batch and converted it to grams:
544 Pot. Carb.
20 Pot. Nit.
7078 grams total or 15.60 pounds
I tested for moisture in the chemicals by cooking100 grams of each all afternoon and found I had moisture contents of:
1% Pot. Carb.
1% Pot. Nit.
The only thing I adjusted in the formula was the soda. I multiplied the total of soda (1270) by .05 to get 63.5 so I added an extra 63 grams of soda to make up for the water. I know this isn't exactly spot on because I'm making up the difference with wet soda and ignoring the 1 or 2% of water in other stuff, but close enough? I'm thinking I want slightly less expansion if anything because I'll be encasing some things and also have lower expansion colors I can use in case of COE troubles.
I tumbled it in a plastic pail rigged up in a cement mixer for 3 hours and began charging this morning. I'm charging at 2000F and it's going flat and ready for more in about 1 hour intervals. Sweet!
Gentleman, start your hammers!!! it's peer review/whack-a-mole time....
If you see any errors...please do speak up!
I'm thinking my next attempts will be some others Pete gave me involving borax or alumina from nepheline syenite....
Am I worrying unnecessarily over glass stability/durability on a glass that will only be used for things like jewelry and C-balls?
Some of the old formulas I've seen for jewelry and knick-nacks have scary amounts of alkalai in them and absolutely no stabilisers, such as alumina or Borax, at all.
Art is not a thing...it's a way.