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Schott Glass 8245 Borosilicate Glass

Category Ceramic , Glass
Manufacturer Schott North America
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
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Material Notes:
Borosilicate glass for sealing to Kovar metal and molybdenum, minimum X-ray absorption, low self radiation, good insulator X-ray tubes, video-frequency tubes, photomultiplier tubes The heavy metal content for the elements lead, mercury, cadmium, and hexavalent chromium is below 100 ppmInformation provided by SCHOTT AG.
Physical Properties Metric English Comments
Density 2.31 g/cc

@Temperature 25.0 °C
0.0835 lb/in³

@Temperature 77.0 °F
Mechanical Properties Metric English Comments
Modulus of Elasticity 68.0 GPa
9860 ksi
Poissons Ratio 0.22
0.22
Thermal Properties Metric English Comments
CTE, linear 5.10 µm/m-°C

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

@Temperature 68.0 - 572 °F
ISO 7991
Thermal Conductivity 1.20 W/m-K

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

@Temperature 194 °F
Transformation Temperature, Tg 505 °C
941 °F
ISO 7884-8
Softening Point 720 °C
1330 °F
Viscosity 10<sup>7.6</sup> dPa s; ISO 7884-3
Working Point 1040 °C
1900 °F
Viscosity 10<sup>4</sup> dPa s; ISO 7884-2
Annealing Point 515 °C
959 °F
Viscosity 10<sup>13</sup> dPa s; ISO 7884-4
Optical Properties Metric English Comments
Refractive Index 1.488

@Wavelength 587.6 nm
1.488

@Wavelength 587.6 nm
Electrical Properties Metric English Comments
Volume Resistivity 790000 ohm-cm

@Temperature 350 °C
790000 ohm-cm

@Temperature 662 °F
2.50e+7 ohm-cm

@Temperature 250 °C
2.50e+7 ohm-cm

@Temperature 482 °F
Dielectric Constant 5.7

@Frequency 1.00e+6 Hz,
Temperature 25.0 °C
5.7

@Frequency 1.00e+6 Hz,
Temperature 77.0 °F
Dielectric Loss Index 0.0080

@Frequency 1.00e+6 Hz,
Temperature 25.0 °C
0.0080

@Frequency 1.00e+6 Hz,
Temperature 77.0 °F
Chemical Properties Metric English Comments
Acid Class, SR 4
4
DIN 12116
Alkali Class, AR 3
3
ISO 695
Descriptive Properties Value Comments
Hydrolytic Resistance Class HGB 3
ISO 719
Stress-optical Coefficient K (10-6mm2N-1) 3.8
DIN 52314
tk100(°C) 215
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