Hello Nagi, And, "Thank you for the warm welcome." Without getting the old chemistry books out: Many of the raw materials which are used in glass not only contain the desired oxide for which it has been included in the batch, but they will have a by-product. This is a product that will release in the form of a gas. This will happen when it reaches the decomposition point of the raw material. The chemical bonds are then broken down in the glass. Thankfully, this is done at the manufacturer. As I stated, I do not know what % of lead would be left in a glass, but I would not be afraid to use any of Bullseye's glass rods, because of the temperatures the raw materials are fired and the amount of time they are held there. I am not familiar at all with Satake lead glass. I know it has a much lower melting point.
I am not going to give you a formula for the typical soda-lime glass, but I believe Calcium Phosphate is used. It is used in most opal glass. There are probably other ones.
Later, Jim
And Pam: It used to be really scary in the stained glass industry!
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