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Precision Glass Tubes High Borosilicate Glass Tubes
We custom produce various kinds of borosilicate glass parts in high precision.
Please send drawing for more details.
Mechanical Properties of High Borosilicate Glass
|
Description |
Standard Value |
|
Main Chemical Composition |
SiO2 80.4%, B2O3 12.7%, Al2O3 2.4%, Na2O+K2O 4.2% |
|
Density (20℃) |
2.23g/cm3 |
|
Silicon Content |
Over 80% |
|
Hardness |
7 Class |
|
Elastic Modulus E |
64KN/mm2 |
|
Tensile Strength |
40-120Nmm-2 |
|
Poisson's Ratio U |
0.2 |
Thermal Properties of High Borosilicate Glass
|
Description |
Standard Value |
|
Coefficient Of Linear Expansion (20-300℃) |
3.3*10-6K-1 |
|
Long-Term Use Temperature |
450° |
|
Maximum Working Temperature/Short-Term Use Temperature |
500°C |
|
Strain Temperature |
520℃ |
|
Annealing Temperature |
560℃ |
|
Softening Temperature |
820℃ |
|
Crystallization Temperature |
695℃-1180℃ |
|
Processing Temperature (104dpas) |
1220℃ |
|
Melting Temperature |
1680℃ |
|
Heat Resistance Temperature Difference |
270℃ |
|
Specific Heat |
0.98Jg-1K-1 |
|
Thermal Conductivity |
1.2Wm-1K-1 |
Electrical Properties of High Borosilicate Glass
Due to its low alkali content, high borosilicate glass can be used as a high insulator, so it is suitable for applications where materials with good non-conductive properties are required at high temperatures (up to 450°C). Because of the unique structure of borosilicate glass, high borosilicate glass has a neutron absorption effect.
Chemical Properties of High Borosilicate Glass
|
Description |
Standard Value |
|
Water resistance (ISO 719) |
ⅠClass |
|
Acid resistance (ISO 195) |
ⅡClass |
|
Alkali resistance (ISO 695) |
ⅡClass |
Optical Properties of Quartz Glass
|
Description |
Standard Value |
|
Refractive index |
1.47 |
|
Light transmittance (2mm) |
92% |
|
Glass stress optical constant |
3.8*10-6mm2/No |
