In its original state Lucite is a powder, from which the crystals are molded under tremendous pressure in precision dies.
The result of the molding operation is a transparent crystal ready to be inserted in the watch. Laboratory tests show that Lucite, while not as hard as glass, is nevertheless harder than celluloid and is resistant to hydrochloric and sulphuric acids. It can be readily ground or filed.
Glastex crystals are being made in the attractive flat top style which is now so popular. They are available in 520 different shapes to fit the most popular models of watches and may be obtained in one or two gross assortments. The numbering system is designed to enable one to use them with any crystal cabinet.