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Bubbling molten glass
Glass and Frit

Bubbling

Bubbling with various gases during melting and refining can improve homogeneity and quality

During melting and refining, you can bubble molten glass by injecting various industrial gases, including oxygen and helium, to help enhance glass melting convection currents and also to improve re-adsorption of any remaining bubbles into the melt in order to eliminate defects.
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Oxygen

Oxygen is more soluble, and compatible with most glass compositions, than air

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Helium

Helium has fastest bubble rise of any gas

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