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Although the latest version of Microsoft Word can still open them, they are no longer developed. Legacy filename extensions include:.doc – Legacy Word document; Microsoft Office refers to them as "Microsoft Word 97–2003 Document".dot – Legacy Word templates; officially designated "Microsoft Word 97–2003 Template"
A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started: [2]
The glass is placed onto a roller table, taking it through a furnace that heats it well above its transition temperature of 564 °C (1,047 °F) to around 620 °C (1,148 °F). The glass is then rapidly cooled with forced air drafts while the inner portion remains free to flow for a short time.
Laminated glass is also used to increase the sound insulation rating of a window, because it significantly improves sound attenuation compared to monolithic glass panes of the same thickness. The interlayer is typically of polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), ionoplast polymers, cast in place (CIP) liquid resin, or ...
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Ground glass surfaces are shown with gray shading. By assembling them in the direction of the arrows, they can be joined. The conically tapered ground glass joints typically have a 1:10 taper and are often labeled with a symbol S T, consisting of a capital T overlaid on a capital S, meaning "standard taper". This symbol is followed by a number ...
Glass fibers have a much higher tensile strength than regular glass (200-500 times stronger than regular glass). [7] This is due to the reduction of flaws in glass fibers [8] and the small cross sectional area of glass fibers, constraining maximum defect size.