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When I use a torch to split a glass tube, there's always a hazy white band which appears. Does anyone know what the cause of this is?

It was a hydrogen-oxygen torch. The glass is fused quartz glass, which should be pure silica.

white band on glass tube apparent after being heated with a torch

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It is sublimed silica according to the following reference at page 8.

http://www.public.asu.edu/~aomdw/GLASS/book.pdf

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