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Topics regarding quality of glass, its processing and its application in building. 

Glass Defect : Glass Knot -- inhomegeneous glass

Hi to all glass people...

This is my 1st time in the forum... and hopefully got feedback from
people around the glass technology field.

As the topic of glass Knot:
1. What is glass knot?
2. Histories and experienced on this glass defects...

As I understand, Glass knot can be happened from reaction of
glass to refractories -- where the solution sac of the inhomogeneous
glass being crystalized and appeared in the products...

Wish can got people feedback on their knowledge on this..

Thanks...
billyeoh