Importance

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Abstract

A vacuum insulating panel may include: a first substrate; a second substrate; a plurality of spacers provided in a gap between at least the first and second substrates, wherein the gap is at pressure less than atmospheric pressure; a pump-out/evacuation tube extending at least partly into an aperture in one of the substrates; and a pump-out/evacuation tube seal. The pump-out/evacuation tube seal may include at least one of: (a) from about 20-80 wt. % tellurium oxide, the tellurium oxide comprising TeO₄ and TeO₃, wherein the pump-out tube seal comprises more TeO₃ than TeO₄ by wt. %; and/or (b) tellurium oxide and from about 10-50 wt. % vanadium oxide, wherein the pump-out tube seal by wt. % comprises more tellurium oxide than vanadium oxide, and wherein the vanadium oxide comprises VO₂ and V₂O₅, and wherein more V in the pump-out tube seal is in a form of VO₂ than V₂O₅. A substantially donut-shaped laser beam may be used to heat pump-out tube material in order to form a pump-out tube seal.

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First Claim