borosilicate glass tube 1.product size:OD40mm*WT3mm*Length400mm 2.melting point is 1200 centigrade degree 3.used in heater
borosilicate glass tube
1.high purity, good spectral transmission, well controlled dimension
2.dimension tolerance
Range of OD | OD | WT | Siding | Out of round | Bow/1220mm |
≤6mm | More or less2.0% | More or less10% | 12% | 2.0% | 2.5mm |
6.00-15.00mm | More or less1.25% | More or less8% | 10% | 1.5% | 2.5mm |
15.00-20.00mm | More or less1.25% | More or less10% | 15% | 1.5% | 2.5mm |
20.00-25.00mm | More or less1.25% | More or less10% | 15% | 1.5% | 3.0mm |
25.00-30.00mm | More or less1.35% | More or less12% | 15% | 1.5% | 3.0mm |
30.00-80.00mm | More or less1.5% | More or less14% | 15% | 2.0% | 3.0mm |
3.chemical composition
Cr | Ge | Fe | Mg | Ti | Ca | Al | Na | Li | K |
0.1 | 0.4 | 1.5 | 0.4 | 0.1 | 0.8 | 16 | 2.3 | 0.5 | 2.0 |
4.spectral transmission at 1.0mm thickness
Nm | ≤220 | 255 | 280 | 315 | 350 | 380 | 590 | 780 |
% | 89 | 91 | 93 | 93 | 93 | 93 | 93.2 | 93.4 |
5.physical properties
Density 20°Ckg/m3 | 2.2 |
Coefficient of expansion 25-300°C/°C | 0.58 |
Softening point(°C) | 1670 |
Annealning point(°C) | 1210 |
Strain point(°C) | 1110 |
Youngs Modulus | 7.3×105 |
clear fused borosilicate glass tube
