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Technical glass

Aluminosilicate glass

Aluminosilicate glass has in its composition alumina (Al2O3), and boron oxide (B2O3). It has properties similar to borosilicate glass, but has better chemical resistance and a higher operating temperature of up to 600 ° C. Compared to the borosilicate glass aluminosilicate glass is more difficult to manufacture.

Aluminosilicate glass products have a high resistance to thermal shock, do not contain alkaline compounds. Their thermal expansion characteristics are similar to characteristics of the products of molybdenum which allows the use of glass in conjunction with materials such molybdenum wires, for example in the manufacture of halogen lamps and other electronic applications.

 

Composition

SiO2  60%
Al2O3  16%
CaO  7%
MgO  6%
BaO  6%
B2O3  4%
others
(SrO, Na2O)
1%

Possible content of heavy metals (ie. lead, cadmium, mercury, chromium) ≤ 100 ppm.

 

Properties:

Density  (@ 18 °C) 2 630 kg/m3
Modulus of elasticity (Young’s) 81 GPa 
Poisson’s ratio 0,24
Thermal conductivity 1,1 W/(m K)
Coefficient of linear expansion 4,6 * 10 -6 °C
Index of refraction (@ 380 - 780 nm) 1.5
UV transmittance (@ 330 nm) ≤ 58%
Softening point 910 °C
Annealing point 688 °C
Max. working temperature: 660 °C
Thermal shock Δ 300 °C

 

Electrical properties:

Volume resistance:                     1012 Ω 
Dielectric constant (@ 1 Mhz):  6,1

Chemical properties:

Hydrolytic resistance (ISO 719): class 1
Acid resistance (DIN 12116):      class 2 
Alkali resistance (DIN 695):        class 3

 

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.