Wholesale Beads
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Double-glazing cells are units in which two sheets of plate or window glass are sealed together at their edges, leaving an air space between. Various types of seals and spacing materials may be used in their construction. As windows they provide superior heat insulation and will not cloud over in moist air. Silica constitutes the basis of glass. It is employed in the state of fine sand or flints; and sometimes for making very fine glass, rock crystal is employed. When sand is used, it ought, if possible, to be perfectly white, for when it is colored with metallic oxides, the transparency of the glass is injured. Such sand can only be employed for very coarse glasses. It is necessary to free the sand from all the loose earthy particles with which it may be mixed, which is done by washing it well with water.
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These, when well made, are perfectly transparent and colorless, heavy and brilliant. They are composed of fixed alkali, pure siliceous sand, calcined flints and litharge, in different proportions. The flint glass contains a large quantity of oxide of lead, which by certain processes is easily separated. The plate glass is poured in the melted state upon a table covered with copper. The plate is cast 1/2 an inch thick or more, and is ground down to a proper degree of thickness, and then polished. |
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