Glass window

At very short times the modulus is on the order of 10" ° N m comparable to ordinary window glass at room temperature. In fact, the mechanical behavior displayed in this region is called the glassy state, regardless of the chemical composition of the specimen. Inorganic and polymeric glasses... 

Optical Properties. Teflon FEP fluorocarbon film transmits more ultraviolet, visible light, and infrared radiation than ordinary window glass. The refractive index of FEP film is 1.341—1.347 (74). 

Uses of glass in constmction products fit into three categories flat glass (window glass) fibrous glass and specialty glass products. Each is made by different processes and has different appHcations. 

The material properties of window glass are summarised in Table 18.1. To use these data to calculate a safe design load, we must assign an acceptable failure probability to the window, and decide on its design life. Failure could cause injury, so the window is a critical component we choose a failure probability of 10The vacuum system is designed for intermittent use and is seldom under vacuum for more than 1 hour, so the design life under load is 1000 hours. 

The concept of protection of one layer of material by another as described in the previous category. Clad Metals, has been extended in a rather unique way to automotive safety glass. Ordinary window glass... 

Fenchel, m. fennel, -geruch, m. fennel odor, -holz, n. sassafras wood, -ttl, n. fennel oil, -wasser, n, (Pharm.) fennel water, Fenchocamphersaure, /, fenchocamphoric acid. Fenster, n, window, -glasi n, window glass, -glimmer, m. muscovite, -kitt, m. glaziera putty,... 

Transparent polyethylene can be also applied to the protection of window glass against aggressive media, e.g., the effect of hydrogen fluoride on the plants producing superphosphate fertilizers. The use of transparent polyethylene film for window glass makes it possible to cut down on the heat losses due to the lower thermal conductance of polyethylene as compared to glass. 

A window consisting of a single piece of clear glass can also he treated with R-value analysis. As with the wall, there is convective and radiative heat transfer at the two surfaces and conductive heat transfer through the glass. The resistance of the window is due to the two surface resistances and to the conductive resistance of the glass, For typical window glass, R = 0.003 (W/ni -°C)" (0.02 (Btu/h-ft -°F) ) so the total resistance of the window is = (0.12 + 0.003 + 0.04) (W/m -- C) ... 

One of the most commonly used measures of durability, i.e. the loss of sodium from the glass, is important to the pharmaceutical and chemical industries, but other changes such as loss of surface quality, are of equal importance for optical and window glasses. The properties of a wide range of technical glasses are well catalogued but the data are often inadequate when considering a particular application and where possible nonstandard whole article tests are advisable. 

Many optical glasses are much less resistant to attack than are container and window glasses, and less severe tests are necessary. A commonly used method is to immerse specimens in either dilute nitric acid or standard acetate solution of pH 4-6 for specified periods at room temperature, then to examine the surfaces either visually or by interferometry. 

Solar radiation through windows has no time lag and must be estimated by finite elements (i.e. on an hour-to-hour basis), using calculated or published data for angles of incidence and taking into account the type of window glass (see Table 26.1). 

Microelectronic circuits for communications. Controlled permeability films for drug delivery systems. Protein-specific sensors for the monitoring of biochemical processes. Catalysts for the production of fuels and chemicals. Optical coatings for window glass. Electrodes for batteries and fuel cells. Corrosion-resistant coatings for the protection of metals and ceramics. Surface active agents, or surfactants, for use in tertiary oil recovery and the production of polymers, paper, textiles, agricultural chemicals, and cement. 

Xu, X., Gibbons, T. and Cortie, M.B. (2006) Spectrally-selective gold nanorod coatings for window glass. Gold Bulletin, 39, 156-165. 

Pollard, A. M. (1979), X-Rays Fluorescence and Surface Studies of Glass with Application to the Durability of Medieval Window Glass, Ph.D. thesis, Univ. York. 

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