Abstract: A straight-through furnace for the heating of glass sheets to their bending and/or toughening temperature is provided with a conveying system bringing the glass sheets (2) in a horizontal position through the furnace (1). The conveying system includes a series of support plates (6). The support plates (6) are each formed of a rigid frame, which is equipped in the manner of a drum skin with a heat-resistant membrane (8) as the support surface for the glass sheet (2).

Abstract: The invention relates to glass substrates intended for use as a support in data storage units, reinforced by surface ion exchanges and whose matrix comprises the constituents given hereinafter in the following weight proportions:______________________________________ SiO.sub.2 45-65% Al.sub.2 O.sub.3 0-20% B.sub.2 O.sub.3 0-5% Na.sub.2 O 4-12% K.sub.2 O 3.5-12% MgO 0-8% CaO 0-13% ZrO.sub.2 0-20% ______________________________________the sum of the oxides SiO.sub.2, Al.sub.2 O.sub.3 and ZrO.sub.2 remaining equal to or below 70%, said composition optionally incorporating the oxides BaO and/or SrO in proportions 11%.ltoreq.MgO+CaO+BaO+SrO.ltoreq.24% and the alkaline oxides are introduced in the following weight percentages 0.22%.ltoreq.Na.sub.2 O/Na.sub.2 O+K.sub.2 O.ltoreq.0.60.

Abstract: A soundproofing laminated glass pane comprising at least two transparent rigid sheets, at least one plastic film, and at least one film having ordinary acoustic performance, provides acoustic results just as good as the plastic film alone. The two films may be separated by an impermeable thin film, such as polyethylene terephthalate.