Abstract: A glass spacer, obtained by a drawing process, having an approximately polygonal bearing cross-section with at least one rectangle having the dimensions a, b, and the spacer having a height 1, the dimensions of the glass spacer satisfying the relationship of a<300 &mgr;m, 0.2 mm<1 <20 mm, and b/a<1000, and preferably b/a<200.

Abstract: The subject of the present invention is a glass spacer intended to keep two substrates spaced apart, its glass matrix having a volume electronic conductivity advantageously between 1031 13 and 1031 5 ohm31 1.cm31 1.

Abstract: The subject of the invention is a glass spacer, obtained by a drawing process, having an approximately polygonal bearing cross section with at least one rectilinear bearing surface which falls within a rectangle having the dimensions a, b, and the spacer having a height l, the dimensions of the spacer satisfying the following relationships:

Abstract: This invention concerns a thermally stable glass composition, which comprises the following constituents in the following proportions by weight:______________________________________ SiO.sub.2 45 to 68% Al.sub.2 O.sub.3 0 to 20% ZrO.sub.2 0 to 20% B.sub.2 O.sub.3 0 to 10% Na.sub.2 O 2 to 12% K.sub.2 O 3.5 to 9% CaO 1 to 13% MgO 0 to 8% ______________________________________the sum of the contents of the oxides SiO.sub.2, Al.sub.2 O.sub.3 and ZrO.sub.2 remaining equal to or less than 70%, the sum of the oxides Al.sub.2 O.sub.3 and ZrO.sub.2 being equal to or greater than 2%, the sum of the alkaline oxides Na.sub.2 O and K.sub.2 O being equal to or greater than 8%, said composition comprising, if desired, the oxides BaO and/or SrO in proportions such that:11%.ltoreq.MgO+CaO--BaO+SrO>30%This glass composition may be used for the production of substrates for an emissive screen or for that of a fire-resistant pane.

Abstract: A covering which is resistant to high temperature and intended to be inserted between tools and plates of hot glass includes a knitted fabric formed from an assembly of stitch wales which gives at least one plane face. The knitted fabric is provided with openings, the polygonal shape of which is determined by a plurality of non-bound segments each including a portion of a stitch wale, and of bound segments formed by making more than four stitches common to two adjacent stitch wales. The making common is obtained by the mutual transfer of stitches from one wale to the other.

Abstract: This invention concerns a thermally stable glass composition, which comprises the following constituents in the following proportions by weight:______________________________________ SiO.sub.2 45 to 68% Al.sub.2 O.sub.3 0 to 20% ZrO.sub.2 0 to 20% B.sub.2 O.sub.3 0 to 10% Na.sub.2 O 2 to 12% K.sub.2 O 3.5 to 9% CaO 1 to 13% MgO 0 to 8% ______________________________________the sum of the contents of the oxides SiO.sub.2, Al.sub.2 O.sub.3 and ZrO.sub.2 remaining equal to or less than 70%, the sum of the oxides Al.sub.2 O.sub.3 and ZrO.sub.2 being equal to or greater than 2%, the sum of the alkaline oxides Na.sub.2 O and K.sub.2 O being equal to or greater than 8%, said composition comprising, if desired, the oxides BaO and/or SrO in proportions such that:11%.ltoreq.MgO+CaO+BaO+SrO<30%This glass composition may be used for the production of substrates for an emissive screen or for that of a fire-resistant pane.

Abstract: A covering made of heat-resistant fibers for tools in contact with glass heated to beyond their softening point, in particular, for bending/tempering tools which are themselves heated in excess of the softening points of the glass sheets, is composed partially of metal fibers and partially of ceramic fibers.

Abstract: Glazings are preshaped before putting them through a step of tempering by contact. In a preferred variant, tempering by contact is applied only the central area of the glazing and the marginal zone thereof is tempered by blowing cold air.