Glass
The process of glassmaking has remained essentially the same
since ancient times. Most glass is a mixture of silica, obtained from beds of
fine sand or from pulverized sandstone, an alkali to lower the melting point,
usually a form of soda or potash for finer glass, lime as a stabilizer and
cullet (waste glass to assist in melting the mixture).
The materials are fused at high temperatures in seasoned
kilns, boiled down, skimmed, and cooled several hundreds of degrees. The molten
glass is ladeled or poured into molds and pressed or blown (sometimes into
molds). The shaped glass is annealed to relieve stresses caused by
manipulation, then is slowly cooled.
Non-Lead
Crystal
Non-lead crystal is glass with a high content of potash,
yielding weight, clarity and sparkle without adding lead content.
Full
Lead Crystal
The addition of lead to the glassmaking process yields a
product with increased luster, clarity and weight. It is also a slightly softer
material than glass, which lends itself well to hand cutting and polishing.
Leaded crystal varies in lead compostion, but to be considered full lead
crystal, the lead content must be 24% or higher. The higher the lead content, the
more sparkle is achieved, but more skill is required to form a shape at the
blowing stage.
Optical
Crystal
Optical crystal is among the finest of all crystals
available. With no lead content, it is clarified to a 100% optically clear
state by the addition of barium, which results in a perfectly flawless clear
glass that shines brightly under any light source. Optical crystal is
manufactured in large thick sheets, and while still molten, is subjected to
tremendous pressure to insure no bubbles, flow lines or other distortion.
Optical crystal is 100% lead free and extremely hard.
Starfire
Crystal
Starfire crystal is a lead-free, low iron product that
presents high clarity resembling that of optical crystal, but at lower cost.
Highly polished, this material produces a bright white sparkle and is therefore
sometimes referred to as "white glass".
Jade
Glass
Jade glass is unique in its light green pigmentation, caused
by the content of iron ore. The resulting material, when beveled and polished,
provides the most economical solution for recognition awards.
Care
Instuctions
Due to the delicate nature of glass and crystal, hand
washing is recommended. Dry with a lint-free cloth to prevent scratching. To
avoid breakage, do not expose glass or crystal to extreme temperatures or to
abrupt temperature changes.