Good day, dear colleagues!
One of the critical point in the glass industry is a glass surface leaching.
Many factors may lead to this problem. Some of them is critical visible on the surface even vefore heat treatment (bending, tempering etc).
But I wanna talk about nonvisible (via human eyes) leaching.
Can You advice any method without destroing glass for identeficate glass surface nonvisible leaching?
If the leaching involve some differences in the height it would be possible to use a optical profilometer which is non-destructive method however do have some limitations in terms of size of sample.
Float glass is commonly used as window glass. Some is also used in liquid crystal displays. However, the company I used to work for did not produce window glass, so I can't answer your question in detail, although I can tell you about it in general.
Dear Stefan Karlsson, great thanks for support
It's an interesting point. This method is good.
We will try to use it. For this aim we need to compare good surface with leaching one.
Probably, it will give us correct result. But it may create a difficulties during the check of large size glass surface. For example, the size is 1200*1000 mm. It need a lot of measuring points to analyzed a surface quality.
Dear Roman Sajzew , great thanks for reply!
We think that this optical method may brings good result.
But I feel that for these measurments it need to good flat surface.
In our case the surface is waved. It creat additional conditions for good checking.
Dear Hiroki Nagai
Thank You for reply
If it possible, please, share with us any information about float glass
You can use FTIR-ATR and to observe the banda distributions. Advance alteration show higher banda of Si-O-Si related to the alteration layer
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