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  • Technical Glasses

    Physical and Technical Properties

  • SCHOTT is an international technology group with 130 years of experience in the areas of specialty glasses and materials and advanced technologies. With our highquality products and intelligent solutions, we contribute to our customers success and make SCHOTT part of everyones life. For 130 years, SCHOTT has been shaping the future of glass technology. The Otto Schott Research Center in Mainz is one of the worlds leading glass research institutions. With our development center in Duryea, Pennsylvania (USA), and technical support centers in Asia, North America and Europe, we are present in close proximity to our customers around the globe.

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  • Foreword

    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. Traditional areas of technical application for glass, such as laboratory apparatuses, flat panel displays and light sources with their various requirements on chemical physical properties, have led to the development of a great variety of special glass types. Through new fields of application, particularly in optoelectronics, this variety of glass types and their modes of application have been continually enhanced, and new forming processes have been developed. The hermetic encapsulation of electronic components has given decisive impetus to development activities. Finally, the manufacture of highquality glassceramics from glass has opened entirely new dimensions, setting new standards for various technical applications.

    To continuously optimize all commercial glasses and glass articles for existing applications and develop glasses and processes for new applications is the constant endeavor of SCHOTT. For such dynamic development, it is essential to be in close contact with the customers and to keep them as well informed as possible about glass.

    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.

    Users should keep in mind that the curves or sets of curves shown in the diagrams are not based on precision measurements but rather characterize and illustrate the typical property profiles of the respective glasses or glass types. Uptodate characteristic values of particular glasses can be found in the tables of this brochure or in separate data sheets.

    Mainz, January 2014

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  • Contents

    1. Types of Technical Glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

    Basic physical & chemical properties of specialty glass

    2. Chemical Stability / Resistance of Glasses . . . . . . . . . . . . . . . . . . . . 8

    2.1 Chemical reaction mechanisms with water, acids, and alkaline solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    2.2 Determination of chemical stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3 The significance of chemical stability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

    3. Mechanical and Thermal Properties . . . . . . . . . . . . . . . . . . . . . . . . .14

    3.1 Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2 Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.3 Elasticity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.4 Coefficient of linear thermal expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    4. Electrical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

    4.1 Volume resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2 Surface resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.3 Dielectric properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.4 Dielectric strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

    5. Optical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

    5.1 Refraction of light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.2 Reflection of light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.3 Transmittance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.4 Color of glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.5 Stress birefringence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

    Application of specialty glass in select fields

    6. Highly Resistant Glasses for Laboratory, Pharma and ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

    6.1 DURAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.2 FIOLAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.3 BOROFLOAT 33/SUPREMAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

    7. Flat Glasses for Home Appliances, Architecture and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

    7.1 AMIRAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 7.2 MIRONA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 7.3 MIROGARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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  • 7.4 PYRAN, PYRANOVA, NOVOLAY secure & PYRANOVA secure . . . . 33 7.5 Processed flat glass for home appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7.6 Special solutions for home appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7.7 Insulated glass doors for commercial refrigeration . . . . . . . . . . . . . . . . . . 35 7.8 Radiation shielding glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

    8. Thin Glasses / UltraThin Glasses for Electronics and More . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

    8.1 BOROFLOAT 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 8.2 Xensation Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 8.3 Thin glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 8.4 Thin glass processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 8.5 Antireflective glasses for technical applications

    (CONTURAN/DARO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

    9. Glasses for Joinings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

    9.1 Sealing glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.2 Glass and glassceramic sealants for technical ceramics . . . . . . . . . . . . . 51 9.3 Glass and glassceramic sealants for solid oxide fuel cells (SOFC) /

    sold elecholyzer cells / SO EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 9.4 Solder glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 9.5 Passivation glasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

    10. GlassCeramics for Industrial Applications and Home Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

    10.1 Introduction to glassceramics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 10.2 PYRAN Platinum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 10.3 ZERODUR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 10.4 NEXTREMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

    11 Optical Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

    11.1 Introduction of Advanced Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 11.2 Product overview . . . .