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Glass Materials

Another category of microwave materials are glasses. Glass in any form, including glass fiber, is a dielectric, or very low conductor of electrical current. Borosilicate glass is used because of its unique sealing properties. Glass composites can be engineered to provide specific dielectric properties.

 

MATERIAL Symbol or formula Relative Dielectric Constant
Glass Materials
Dissipation Factor tan
Glass Materials
Mass Density
(gr/cc)
Melting Point
°C
Melting Point
°F
Temp Coefficientof Expansion
(ppm/°C)
Corning 0080 soda lime     2.47 696 1285 9.4
Corning 0088              
Corning 7050 soda borosilicate     2.24 703 1297 4.6
Corning 7052 alkali barium borosilicate 4.9   2.28 712 1314 4.7
Corning 7056 alkali borosilicate 5.7   2.29 718 1324 5.2
Corning 7070 lithia potash borosilicate 4.1   2.13     3.2
Corning 7740 borosilicate Pyrex 5.1   2.23 821 1510 3.3
Corning 7913 96% Silica, Vycor 3.8   2.18 1530 2786 7.5
Corning 9010 alkali barium     2.64 646 1195 8.9
Corning 9013 alkali barium     2.64 656 1213 8.9
Schott 8250 borosilicate 4.9 0.0022 2.28 720 1328 5

Author : Unknown Editor

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