SCHOTT Technical Glasses
Apart from its application in optics, glass as a technical material has exerted a formative influence on the development of important technological fields such as chemistry, pharmaceutics, automotive, optics, optoelectronics and information technology. SCHOTT Technical Glasses offers pertinent information in concise form. It contains general information for the determination and evaluation of important glass properties and also informs about specific chemical and physical characteristics and possible applications of the commercial technical glasses produced by SCHOTT. With this brochure, we hope to assist scientists, engineers, and designers in making the appropriate choice and make optimum use of SCHOTT products.
Apart from its application in optics, glass as a technical material has exerted a formative influence on the development of important technological fields such as chemistry, pharmaceutics, automotive, optics, optoelectronics and information technology. SCHOTT Technical Glasses offers pertinent information in concise form. It contains general information for the determination and evaluation of important glass properties and also informs about specific chemical and physical characteristics and possible applications of the commercial technical glasses produced by SCHOTT. With this brochure, we hope to assist scientists, engineers, and designers in making the appropriate choice and make optimum use of SCHOTT products.
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60<br />
10.2 PYRAN ® Platinum<br />
PYRAN ® Platinum is the world’s first fire-rated glass-ceramic<br />
material manufactured using the microfloat process. It offers<br />
an outstanding surface quality and unprecedented color<br />
neutrality.<br />
PYRAN ® Platinum is the only environmentally-friendly firerated<br />
glass-ceramic produced without the hazardous heavy<br />
metals arsenic, antimony and barium. It is UL (Underwriters<br />
Laboratories) classified for fire-ratings up to 90 minutes and<br />
passes the required hose stream test. PYRAN ® Platinum firerated<br />
glass-ceramic is intended for use in non-impact, safetyrated<br />
locations such as transoms and windows. The filmed<br />
and laminated PYRAN ® Platinum glass-ceramic products are<br />
impact safety-rated and meet the requirements according<br />
to ANSI (Cat. I and II). They are intended for use in safetyrated<br />
locations such as door lites, transoms or sidelites, and<br />
windows.<br />
Unit Product<br />
class<br />
α 0/50 10 –6 /K Extreme<br />
Special<br />
Exp Cl 0<br />
Exp Cl 1<br />
Exp Cl 2<br />
α 20/300 10 –6 /K<br />
α 20/700 10 –6 /K<br />
α 20/500 10 –6 /K<br />
α 20/600 10 –6 /K<br />
Density<br />
Young’s<br />
modulus E<br />
Poisson’s<br />
ratio µ<br />
g/cm 3<br />
GPa<br />
ZERODUR ®<br />
0 ± 0.007<br />
0 ± 0.010<br />
0 ± 0.02<br />
0 ± 0.05<br />
0 ± 0.1<br />
+ 0.1<br />
–<br />
+ 0.2<br />
–<br />
2.53<br />
90<br />
0.24<br />
Glass-ceramics for<br />
cooktop panels<br />
– 0.2<br />
– 0.01<br />
–<br />
+ 0.15<br />
2.56<br />
92<br />
0.24<br />
Table 18. Coefficient of linear thermal expansion α, density and elastic<br />
properties of ZERODUR ® and glass-ceramics for cooktop panels<br />
10.3 ZERODUR ®<br />
ZERODUR ® glass-ceramic whose coefficient of linear thermal<br />
expansion at room temperature can be kept as low as<br />
≤ ± 0.007 x 10 –6 /K (Table 18) was originally developed for<br />
the production of large mirror substrates for astronomical<br />
telescopes. Today ZERODUR ® is used in components for<br />
applications, which require the tightest control of dimensions<br />
under temperature variation such as IC and LCD lithography,<br />
precision measurement and navigation of airplanes and<br />
submarines.<br />
To meet the highest precision requirements the production<br />
of ZERODUR ® TAILORED can be adapted to achieve minimal<br />
thermal expansion at customer application temperature<br />
conditions.<br />
Next to the extremely low values of thermal expansion, the<br />
homogeneity of this property is of crucial importance for<br />
IC lithography components. ZERODUR ® blanks up to 4 m in<br />
size are frequently produced with CTE homogeneity values<br />
in the range of several parts per billions per degree K.<br />
10.4 NEXTREMA<br />
Besides the well-known glass-ceramic products ROBAX ®<br />
for fireplace and CERAN ® for cooktop applications, <strong>SCHOTT</strong><br />
has developed and introduced the new glass-ceramic family<br />
Nextrema. Nextrema glass-ceramic panels are recommended<br />
for use in technical applications. NEXTREMA<br />
demonstrates what makes glass-ceramic a ground-breaking<br />
PYRAN ® Platinum fire-rated glass-ceramic product lines pass the fire and<br />
hose stream tests.<br />
8.2-m telescope mirror blank, ZERODUR ® glass-ceramic
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