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Dear forum,

I want to fuse two layers of float glass.
And I know I have to consider the tin side of that glass.
But do I have to put the tin side in the middle or on the out side?

Hoping you can help me

First, the tin side goes down. This will result in a smooth bottom. Air side down results in rough bottom. Second, if you are going to slump the glass, the tin side will fog up where it is being compressed (inside of a bowl shape). So, if you are doing a bowl. put the air side up. Remember that float glass anneals about 80ºF hotter than fusing glasses. If you are using any colors on the interior, the tin side can effect colors. You need to test.

Hi Bert,

Thank you very much!
It's very hard to get that kind of information.
But what about the second layer? Most float is 3 or 4 mm, the second layer also tin side down?

Hoping you can help me

joopglas wrote:Hi Bert,

Thank you very much!
It's very hard to get that kind of information.
But what about the second layer? Most float is 3 or 4 mm, the second layer also tin side down?

Hoping you can help me

If there is no color inside, I would put the air side up. When I use color, I prefer to use colors that will come out looking good when there is a tin side in contact with it, so I can put the top layer tin side down.

I only work with 10mm or 6mm thick float glass.

Funny me, I don't bother with purchasing another device such as this special light for detecting the surface of plate glass. I find it refreshing to go for it, as is. So far, it's worked!