Vacuum insulated panel with glass for seal material to improve performance and method of making same

A method of making a vacuum insulating panel, the vacuum insulating panel comprising a first substrate, a second substrate, a plurality of spacers provided in a gap between at least the first and second substrates, and a seal provided at least partially between at least the first and second substrates, the seal comprising a seal layer;

• wherein the method comprises:
• providing glass in a location between at least the first and second substrates, the glass to be used in forming the seal layer, and wherein the glass comprises:
• tellurium oxide:
• from about 20-75 wt. %;
• vanadium oxide:
• from about 15-45 wt. %;
• aluminum oxide:
• from about 0-5 wt. %;
• and
• zinc oxide:
• from about 0-10 wt. %;
• wherein the glass comprises less TeO3 than TeO4 in terms of mol % before heating to form the seal layer;
• wherein the glass has a ratio LSPT/DSPT, of the Labino softening point (LSPT) to the Dilatometric softening point (DSPT), in degrees C., from about 1.05 to 1.25;
• heating the glass in order to form the seal layer;
• and
• after forming the seal layer, evacuating the gap to a pressure less than atmospheric pressure.

Glass for use in forming a seal layer of a vacuum insulating panel, the glass comprising:

• tellurium oxide:
• from about 20-75 wt. %;
• aluminum oxide:
• from about 0-5 wt. %;
• zinc oxide:
• from about 0-5 wt. %;
• tungsten oxide:
• from about 0-1 wt. %;
• molybdenum oxide:
• from about 0-1 wt. %;
• and
• bismuth oxide:
• from about 0-1 wt. %.

Glass for use in forming a seal layer of a vacuum insulating panel, the glass comprising:

• tellurium oxide:
• from about 20-75 wt. %;
• aluminum oxide:
• from about 0-5 wt. %;
• zinc oxide:
• from about 0-5 wt. %;
• tungsten oxide:
• from about 0-1 wt. %;
• molybdenum oxide:
• from about 0-1 wt. %;
• and
• wherein the glass comprises less TeO3 than TeO4 in terms of mol % before heating to form a seal layer of a vacuum insulating panel;
• wherein the glass has a ratio LSPT/DSPT, of the Labino softening point (LSPT) to the Dilatometric softening point (DSPT), in degrees C., from about 1.05 to 1.25.