Glass materials

Updated April 23, 2004

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	Dissipation Factor tan	Mass Density (gr/cc)	Melting Point °C	Melting Point °F	Temp Coefficient of 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

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