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 high borosilicate glass
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product performance
| mechanical property |
ρ |
2.23±0.02g/cm3 |
| Mohs hardness |
大于7 |
| thermodynamic property |
thermal expansivity |
（0-300℃)（3.3±0.1）×10-6K -1 |
| softening point |
820±10℃ |
| strain point |
516±10℃ |
| specific heat |
(20-100℃）0.82KJ×（㎏×K）-1 |
| thermal conductivity |
1.2W×（m×K）-1 |
| Thermal shock resistance |
180K |
| Identical temperature difference |
100K |
| Max. Operating Temperature |
短期(<10h) 500℃，长期(>10h)450℃ |
| chemical property |
Water resistance |
ISO719/DIN12111 HGB1 |
| ISO720 HGA1 |
| acid fastness |
ISO1776/DIN12116 1 |
| resistance to alkali |
ISO695/DIN52322 A2 |
| optical property |
refractive index |
Nd:1.47384 |
| transmittance |
>91% |
| eletric property |
resistivitylgρ |
250℃ 8.0Ω×㎝ |
| dielectric loss |
tanσ(1兆周20℃) 38×10-4 |
| dielectric constantε |
4.7 |
| maximum dimensions |
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rule 750mmm×1200mm |
| thickness |
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Float process 1.5——25mm other process 0.5——150mm |
| attension: thickness rule include:1.5mm,2mm,2.5mm,3mm,3.3mm,4mm,5mm,6mm,8mm,10mm,12mm,13mm,20mm,22mm,25mm |
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