Lead-crystal glass

Lead crystal glasses contain 24—32 wt. % PbO. A typical composition is shown in Table 11. However, there are also a number of transient types with a PbO content between 4—10%, which, besides Si02, PbO and KjO, also contain BaO (raising the refractive index) as well as other oxides (Na20, CaO, 2nO, MgO, etc.). The oxides PbO, ZnO, BaO and K2O arc considered as beneficial for the quality. 

Colourless container glass Sodium-potassium crystal glass Lead crystal glass (24 % PbO) Simax (Pyrex) ... 

Ravenscroft, George developed lead crystal glass during the last quarter of the seventeenth century to rival the Venetian cristallo developed during the early sixteenth century. He was granted a patent in March 1674 for a crystalline glass resembling rock-crystal. ... 

George Ravenscroft, an English glassmaker, developed lead-crystal glass (also known as flint glass). The... 

If Pb were added to a typical lead crystal glass, what weight percent would he added What atomic percent of Pb would the glass then contain What is actually added in industrial practice and will this practice continue in the future ... 

For air (ni 1) and optical glass (/I2 1.5) R is 4%, whereas lead-crystal glass ( 2 2.1) gives an R of -13%. Equation 32.6 will be very important when we use dielectrics as antireflection coatings (ARCs) we then have to consider two interfaces. The thickness of the films and the nature of the reflecting surface will also be important. Ceramic applications of reflection are numerous but are often linked to refraction. 

Full Lead Crystal Glass. A crystal GLASS (q.v.) specified in B.S. 3828 as containing >30% PbO and >12% alkali ... 

Sugar. A fault on lead crystal glass resulting from inadequate control during acid polishing and revealed as crystallites on the surface of the glass. 

Soda-lime glass Lead crystal glass Glass wool Borosilicate glass Fused quartz Fused silica... 

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