Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Eric asked in 科學及數學工程學 · 1 decade ago



2 Answers

  • ?
    Lv 6
    1 decade ago
    Favorite Answer

    Sand-Blasting is produced by spraying sand at high velocities over the surface of the glass. This gives the glass a translucent surface, which is usually rougher than that obtained by etching. During sandblasting, only the areas that are to remain transparent are masked for protection. The depth and degree of the translucency of the sand-blasted finishing vary with the force and type of sand used. Sand-blasted glass can be used in numerous interior design applications in both residential and commercial settings: doors, shower screens, partitions and interior screens, furniture, etc

    Sandblasting Systems

    There are basically two types of sandblasters, siphon feed and pressure pot. They work much like their names. The siphon feed pulls the abrasive from the container using suction power that is created in the sandblasting gun itself. Air is passed over the hose end that leads to the abrasive, creating a suction, and then the abrasive is mixed with the air and sprayed out the nozzle.



    Source(s): extracted from web references
  • 1 decade ago

    Pure silica (SiO2) has a melting point of about 2,000° C (3,600° F), and while it can be made into glass for special applications (see fused quartz), other substances are added to common glass to simplify processing. One is soda (sodium carbonate Na2CO3), which lowers the melting point to about 1,000° C (1,800° F). However, the soda makes the glass water-soluble, which is usually undesirable, so lime (calcium oxide, CaO), some MgO and aluminum oxide are added to provide for a better chemical durability. The resulting glass contains about 70 to 72 percent silica by weight and is called a soda-lime glass. Soda-lime glasses account for about 90 percent of manufactured glass.

    As well as soda and lime, most common glass has other ingredients added to change its properties. Lead glass, such as lead crystal or flint glass, is more 'brilliant' because the increased refractive index causes noticeably more "sparkles", while boron may be added to change the thermal and electrical properties, as in Pyrex. Adding barium also increases the refractive index. Thorium oxide gives glass a high refractive index and low dispersion, and was formerly used in producing high-quality lenses, but due to its radioactivity has been replaced by lanthanum oxide in modern glasses. Large amounts of iron are used in glass that absorbs infrared energy, such as heat absorbing filters for movie projectors, while cerium(IV) oxide can be used for glass that absorbs UV wavelengths (biologically damaging ionizing radiation).

    Glasses that do not include silica as a major constituent are sometimes used for fibre optics and other specialized technical applications. These include fluorozirconate, fluoroaluminate, and chalcogenide glasses.

Still have questions? Get your answers by asking now.