Abstract: A top plate (3) of a low-expansion crystallized glass of deep color, with a first enamel coating coated on a heating portion (5, 7, 9, 11) of the plate and a second enamel coating coated on a non-heating portion (13) around and other than the heating portion. The first enamel coating consists essentially, by weight, of 40 to 98% glass content, 5 to 55% at least one of ZrSiO.sub.4 and ZrO.sub.2 crystals, and 0 to 54% coloring pigment. The second enamel coating consists essentially, by weight, of 30 to 94% glass content, 5 to 69% TiO.sub.2 crystals, 0 to 34% coloring pigment.

Abstract: In order to provide an enamel frit composition capable of preventing a hue of a low-expansion crystallized glass plate of a dark color from being seen through an enamel coating without increasing the thickness of the enamel coating and the mixing ratio of a coloring pigment as well as to provide an enamel-coated low-expansion crystallized glass plate using the above-mentioned composition, the enamel frit composition for a low-expansion crystallized glass essentially consists, by weight, of 30-94 wt % glass powder, 5-69 wt % TiO.sub.2 powder, and 0.05-34 wt % coloring pigment.

Abstract: In order to provide an enamel frit composition for a low-expansion crystallized glass, capable of producing an enamel coating excellent in abrasion resistance and acid resistance without occurrence of cracks by using glass powder which does not contain any harmful component such as PbO, and to provide an enamel-coated low-expansion crystallized glass plate using the enamel frit composition, the enamel frit composition for a low-expansion crystallized glass essentially consists 40-98 wt % glass powder, 1-55 wt % coloring pigment, and 0-54 wt % filler. The glass powder consists, by weight, of 55-72% SiO.sub.2, 4-8% Al.sub.2 O.sub.3, 14-22% B.sub.2 O.sub.3, 2-4% BaO, 5.1-15% Na.sub.2 O, 0-2% Li.sub.2 O, 0-2.8% K.sub.2 O, and 0-2% F.sub.2.

Abstract: A fire protective glass panel for use in a fire protective window, door, and partition wall, which comprises at least one sheet of fireproof glass plate and a fluorocarbone resin film of a chain molecular structure type bonded to a side surface of the glass plate and which has non-shattering property as well as fire protection property wherein the fireproof glass plate is a heat-resistant and light transparent crystallized glass plate or, alternatively, the fireproof glass plate is a wire glass plate and the fluorocarbone resin film has a thickness of 0.02-1 mm and is made of one of FEP, PFA, PCTFE, ETFE, and PVDF.