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Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [2]
Special optical glass (similar to Lead crystal) Fused silica Germania glass ... 86.7 72.3 89.5 169 67.8 145 Young's modulus at 20 °C, GPa 72 65 75 67 72
With respect to glass, the term flint derives from the flint nodules found in the chalk deposits of southeast England that were used as a source of high purity silica by George Ravenscroft, c. 1662, to produce a potash lead glass that was the precursor to English lead crystal.
Braun was the only foreign licensee of the QUAD electrostatic loudspeaker for a time. In 1954, the company also began producing film slide projectors, a mainstay of its business for the next forty years. By 1956, the company was marketing the first fully automatic tray film slide projector known as the PA 1. [nb 1] [7]
Uranium (0.1 to 2%) can be added to give glass a fluorescent yellow or green color. [8] Uranium glass is typically not radioactive enough to be dangerous, but if ground into a powder, such as by polishing with sandpaper, and inhaled, it can be carcinogenic. When used with lead glass with very high proportion of lead, produces a deep red color.
Asbestos, a known human carcinogen, can be injurious to consumers if found in talc-containing cosmetic products as there is no established "safe level" threshold for exposure to the substance. If ...
Let’s say you currently pay $1,800 per month for your home loan with a 7.75% interest rate, with $250,000 and 25 years left on your mortgage. Here’s how your existing mortgage would compare to ...
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