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Schott Glass 8253 Alkaline Earth Aluminosilicate Glass

Category Ceramic , Glass
Manufacturer Schott North America
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Schott Glass 8253 Alkaline Earth Aluminosilicate Glass.pdf
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Material Notes:
Alkaline earth aluminosilicate glass for high temperature application in electrical engineering, for sealing to molybdenum, for use at higher temperatures than glass 8252, free from alkali Bulb and exhaust tube for halogen lamps for automotive, household, and general lighting The heavy metal content for the elements lead, cadmium, mercury, and hexavalent chromium is below 100 ppmInformation provided by SCHOTT AG.
Physical Properties Metric English Comments
Density 2.67 g/cc

@Temperature 25.0 °C
0.0965 lb/in³

@Temperature 77.0 °F
Mechanical Properties Metric English Comments
Modulus of Elasticity 83.0 GPa
12000 ksi
Poissons Ratio 0.23
0.23
Thermal Properties Metric English Comments
CTE, linear 4.70 µm/m-°C

@Temperature 20.0 - 300 °C
2.61 µin/in-°F

@Temperature 68.0 - 572 °F
ISO 7991
Thermal Conductivity 1.10 W/m-K

@Temperature 90.0 °C
7.63 BTU-in/hr-ft²-°F

@Temperature 194 °F
Transformation Temperature, Tg 790 °C
1450 °F
ISO 7884-8
Softening Point 1005 °C
1841 °F
Viscosity 10<sup>7.6</sup> dPa s; ISO 7884-3
Working Point 1305 °C
2381 °F
Viscosity 10<sup>4</sup> dPa s; ISO 7884-2
Annealing Point 795 °C
1460 °F
Viscosity 10<sup>13</sup> dPa s; ISO 7884-4
Strain Point 750 °C
1380 °F
Viscosity 10<sup>14.5</sup> dPa s; ISO 7884-7
Optical Properties Metric English Comments
Refractive Index 1.547

@Wavelength 587.6 nm
1.547

@Wavelength 587.6 nm
UV Transmittance <= 72 %

@Thickness 1.00 mm,
Wavelength 330 nm
<= 72 %

@Thickness 0.0394 in,
Wavelength 330 nm
Component Elements Properties Metric English Comments
Alkalis <= 0.030 %
<= 0.030 %
Total Alkali Oxide
Electrical Properties Metric English Comments
Volume Resistivity 1.00e+11 ohm-cm

@Temperature 350 °C
1.00e+11 ohm-cm

@Temperature 662 °F
1.00e+13 ohm-cm

@Temperature 250 °C
1.00e+13 ohm-cm

@Temperature 482 °F
Dielectric Constant 6.6

@Frequency 1.00e+6 Hz,
Temperature 25.0 °C
6.6

@Frequency 1.00e+6 Hz,
Temperature 77.0 °F
Dielectric Loss Index 0.0015

@Frequency 1.00e+6 Hz,
Temperature 25.0 °C
0.0015

@Frequency 1.00e+6 Hz,
Temperature 77.0 °F
Chemical Properties Metric English Comments
Acid Class, SR 2
2
DIN 12116
Alkali Class, AR 2
2
ISO 695
Descriptive Properties Value Comments
Hydrolytic Resistance Class HGB 1
ISO 719
Stress-optical Coefficient K (10-6mm2N-1) 2.7
DIN 52314
tk100(°C) 630
DIN 52326
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