Normal glass types tend to lie along a straight line between the two points which would be plotted for the two glass types 511605 nsl7 and 620363 pbm2. In the ultraviolet uv and infrared ir wavelength range below 400nm and over 1060nm. B 270 superwite optical properties university of chicago. Bk7 is a barium borosilicate glass known for its high transmission and clean, clear appearance.
Pdf borosilicate glass bk7 is a widelyused material in integrated optics devices and in the optical communications industry. Schott nbk 7 optical glass data sheet sydor optics. Figure 22 shows the internal transmittance of a typical n bk7 sample. With superior physical properties, it can be polished like leaded glass, making it suitable for lenses and prisms for lasers and optics. The high material quality is a primary technical reason why nbk7 glass is often the number one choice for optical windows, lenses, and prisms. Optical glass nbk7 types data sheet optical glass nbk7 types msds. As an optical couplant, it is used to reduce or eliminate reflection losses. Thermal and structual properties of candidate moldable glass types. The distance that each glass type lies away from this normal line is called x,y.
Technical glasses glass manufacturers glass processing. These glass properties such as density, tg, and refractive index are reported for the glass. Chemical properties of optical glass gives an overview of. Optical bk7 borosilicate crown glass is used for windows, lenses, and prisms where transmission in the range 0. Corning 7059 nearzero alkali baria alumina borosilicate composition was originally developed for thin film electronic circuits, which require an extremely smooth substrate with special electrical properties. Lapp sppr02 corning incorporated, corning ny biography dr.
Writing lowloss waveguides in borosilicate bk7 glass. The surfaces are fire polished and highly resistant to solar radiation offering a low cost solution. Nbk7 optical borosilicatecrown glass from schott bk 7. Commercial quality windows, circular, nbk7 optical glass. Shortly after the wave is emitted, reflection and transmission occur at the waterglass boundary, as shown in fig. Optical glass types are designated by symbols of the factory options per gost 3514 optical glass specification or din 58925 optical glass principal concepts. Low density 12 % lighter than soda lime glass excellent chemical durability. There is a huge range of glasses available for which we hold data and some stock. Tie31 mechanical and thermal properties of optical glass. Bk7 is a high quality optical glass that is used whenever the additional benefits of fused silica are not required.
From our experience that they have different charactories. It is not recommended for use with acrylic as it is slightly incompatible at elevated temperatures. Composition alkali alkalineearth silicate glasses usually about 1216%. B 270, manufactured by the updraw method, offers high stability with respect to solarization in combination with high transmission in the visible wavelength range. Borofloat of schott ag, a borosilicate glass, which is produced to flat glass in a float process. Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows, welding window substrates. It can be selected nearly free of bubbles and inclusions and has very good homogeneity. Types of technical glasses in the following, technical glasses are understood to be spe cial glasses manufactured in the form of tubes, rods, hollow vessels and a variety of special shapes, as well as flat glass and glass powder for use mainly in chemistry, laboratory technology, pharmaceuticals, optoelectronics, and house.
Most glass makers produce this glass under slightly different names. Og1052 optical gel has the refractive index of bk7 glass and is close to the refractive index of other frequently used glasses. Sodalime glass sodalime glass is often referred to as float glass because it is formed by drawing glass over molten tin baths. Crown glass is a type of optical glass used in lenses and other optical components. Writing lowloss waveguides in borosilicate bk7 glass with a. Highborate borosilicate glass is also known as leachable alkaliborosilicate glass with an optimum composition of 62. Optical glass collection group glass gost schott hoya light crown lk fk fc. Bk7 and hk9l are high quality optical glasses that are used whenever the. Since bk7 performs well in all chemical tests, and no additional or special handling is required, costs of manufacturing are reduced. Schott bk7 glass wafers optical properties bk7 glass. Of these, hydrofluoric acid has the most serious effect and, even when a solu. Effect of glass composition and fiber diameter on tensile strength a fused silica in vacuum after.
Optical glass n bk7 types data sheet optical glass n bk7 types msds. Optical constants of schott bk borosilicate crown pbk7. Refractive index of schott bk borosilicate crown pbk7. Hk9l are used for standard optical glass components, or when. The mechanical properties of glass theoretical strength, practical strength, fatigue, flaws, toughness, chemical processes. Safety data sheet borosilicate nbk7 optical glass according to regulation ec no. Schott optical glasses are available in the form of raw glass, cut blanks, pressings as well as finished components. Radiation shielding glass radiation shielding glass has been developed specifically for nuclear technology. This glass can be further processed to produce controlled pore glass cpg which is widely used as a stationary media in chromatography, or. Corningglass 7059 properties vin karola instruments. Pdf borosilicate bk7 glasses doped with different amounts of ceo2 0.
Tie31 mechanical and thermal properties of optical glass back to index the torsion of a rod is characterized by the modulus of torsion or shear modulus g. Bk 7 hk9l b270 description bk7 produced by schott and its equivalent hk9l are used for standard optical glass components, or when optical glass is requested for customized items. For example, ukraine gost k8 germany schott bk7 japan hoya bsc7 table 1. Bk7 optical glass bk7 is a very popular crown glass. Several methods to characterize the strength of optical glass are discussed to aid engineers in predicting a design strength for a given surface finish, glass type, and environment. Schott bk7 glass is an optical property with high transmission. Bk7, the most common optical glass, sk for high ba. His area of expertise is in glass composition and property relationships. This page displays only the text of a material data sheet. Optical and photonic glasses lecture 12 lehigh university.
Pdf writing lowloss waveguides in borosilicate bk7 glass with a. The high material quality is a primary technical reason why n bk7 glass is often the number one choice for optical windows, lenses, and prisms. Cvi laser optics lenses are made of synthetic fused silica, nbk7 grade a fine annealed glass, and several other materials. Bk7 glass, an optical borosilicate crown glass, has a high transmission and is free of bubbles and inclusions. Schott also publishes a glass catalog schott optical glass datasheets, which is a standard reference for the. To see matwebs complete data sheet for this material including material property data, metal compositions, material suppliers, etc, please click the button below. It is drawn into sheets of finished thickness, obtaining the final smooth, and flat surface finish directly from the molten glass. Nbk7 is a schott designation for the most common borosilicate crown glass used for a wide variety of visible applications.
Bk7 of schott, a borosilicate glass with a high level of purity. Pdf structure of borosilicate glass according to raman. B 270 superwite b 270 superwite is a clear high transmission crown glass modified sodalime glass available in form of sheets, optical rods, profiled rods, strips and chain moulded rod. Dsc 2920 differential scanning calorimeter operators manual. Esco carries a complete line of bk7 optical glass windows for sight glasses, instrument windows, beamsplitter substrates, welding window substrates and more. Pyrex technical information properties of borosilicate pyrex 7740 glass chemical resistance borosilicate glass is inert to almost all materials with the exception of hydrofluoric acid, hot phosphoric acid and hot alkalies. The properties e, g and are character istic constants of the individual glass type and depend on the chemical composition of the glass. Borosilicate glass is offered in slightly different compositions under different trade names. Some of our glass types contain lead in order to exploit its high radiation absorption. Borosilicate glass an overview sciencedirect topics. Between 400nm and 1060 nm the internal transmittance is higher than 99% for a 25mm thick sample. Pdf borosilicate glass bk7 is a widelyused material in integrated optics devices and. Technical glass schotts technical glass is designed to meet specific requirements. Leached layers that are also called silicate gel layers because of their composition are formed over the course of time.
Bk7 glass optical borosilicate crown glass manufacturer. However, certain glass types fall between these groups or even completely outside. Chemical properties of optical glass university of arizona. High electrical resistance for hermetic sealings, superior. Our latest list of preferred schott optical glass includes approximately 120 glass types which are classified into glass groups based upon similar chemical composition and are illustrated in. B270i ultra white crown glass windows and plates make a good choice when a simple clear glass material is required and is optically crystal clear with high transmission in the visible range. This neglects the specific glass composition, subcritical crack growth, surface area under stress, and nature of the load static or cyclic. Selecting a glass material is important since different glass types have different characteristics. After 1945, many new optical glass compositions were developed, together with.
Its good physical and chemical properties make it widely used in visible and near ir range. Crown glass is produced from alkalilime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses. Good physical and chemical properties mean it is widely used. It is by far the most common material for many optical glass applications, because it offers good optical properties and a reasonable price. Pdf optical characterization of bk7 borosilicate glasses. Design strength of optical glass university of arizona. The perpendicular component is the longitudinal wave traveling vertically with a wavelength of about 6 mm corresponding to the longitudinal wave velocity in the glass bk7. Structure of borosilicate glass according to raman spectroscopy data article pdf available in glass and ceramics 6711. This may include the use of gloves when manual handling is necessary. N bk7 is a schott designation for the most common borosilicate crown glass used for a wide variety of visible applications. Bk7 is a borosilicate crown optical glass with high homogeneity, low bubble and inclusion content. B 270 flat glass to meet a variety of different market demands, schott offers its wellknown b 270 crown glass in sheet glass form. The smooth transmission, as well as a low absorption in the entire visible wavelength range, are a crucial feature for a large number of optical applications.
Refractive index of schott bk borosilicate crown nbk7. This unique special float glass is manufactured by schott technical glass solutions gmbh using the microfloat process and the latest technology. Layer formation in large quantities of neutral or acidic media, chemical processes occur in which cations from the glass preferably alkali ions are exchanged with the hydrogen ions from the solution. Its used often as a standard of comparison for other glass materials.
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