Color cathode ray tube and glass frit for color cathode ray tubes

A glass frit for color cathode ray tubes, which comprises

• a crystalline low melting glass powder,
• a low expansion filler containing α-alumina, and
• a crystallizing filler consisting of an α-4PbO.B2O3 crystal powder and/or a Pb3O4 crystal powder,
• wherein part of the above α-alumina is corpuscular α-alumina having a particle size not larger than 3 μm, and
• the contents of the above respective components as represented by mass percentage based on said glass frit are as follows:
• crystalline low melting glass powder:
• 90-99%,
• low expansion filler:
• 1-10%,
• and the content of the above α-alumina is from 0.1 to 7% based on the sintered glass frit, and
• the content of the corpuscular α-alumina of the above α-alumina is from 0.1 to 5% based on the sintered glass frit.

A glass frit for color cathode ray tubes, which comprises

• a crystalline low melting glass powder,
• a low expansion filler containing α-alumina, and
• a crystallizing filler containing at least one member selected from the group consisting of an α-4PbO.B2O3 crystal powder and/or a Pb3O4 crystal powder, MgO, Fe2O3 and monoclinic-ZrO2,
• wherein the contents of the respective components as represented by mass percentage based on the above glass frit are as follows:
• crystalline low melting glass powder:
• 90-98.99%,
• low expansion filler:
• 1-9.99%,
• crystallizing filler:
• 0.01-5%,
• and the content of the above α-alumina is from 0.1 to 7% based on the glass frit.