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Glass Materials |
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- Low expansion glass: TCM(Patent No.2031876, Patent No.2070949)
- Heat-resistant glass: New materials XHK, H-3, K-6
- Filter glasses: Hard glass with UV protection, infrared ray permeable glass, etc.
- Materials being developed: Phosphate glass, other new materials
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Properties of Typical Glass
| Properties |
Borosilicate glass |
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Crystallized Grass |
| H-3 |
K-6 |
XHK |
TCM |
| Density(kg/m3) |
2.3×103 |
2.2×103 |
2.5×103 |
2.4×103 |
| Thermal expansion coeff(×10-7/K) |
53 |
39 |
34 |
-1~15 |
| Glass transition point(degreeC) |
490 |
500 |
680 |
- |
| Deformation point(degreeC) |
575 |
615 |
770 |
760 |
| Strain point(degreeC) |
469 |
480 |
643 |
- |
| Annealing point(degreeC) |
510 |
530 |
697 |
- |
| Softening point(degreeC) |
696 |
745 |
930 |
- |
| Thermal shock temp.difference(degreeC) |
120 |
185 |
210 |
450 |
| Abraded strength(MPa) |
113 |
127 |
133 |
155 |
| Vickers hardness(Hv) |
615 |
530 |
610 |
710 |
| Young's modulus(GPa) |
69 |
64 |
81 |
87 |
| Poisson ratio |
0.2 |
0.20 |
0.24 |
0.26 |
| Thermal conductivity(W/m・K) |
0.94 |
1.25 |
1.09 |
1.53 |
| Specific heat(J/kg・K) |
676 |
1050 |
783 |
750 |
| Refractive index(Nd) |
1.491 |
1.477 |
1.515 |
- |
| Water resistance(Na2Omg)* |
0.47 |
0.10 |
0.05 |
0.05 |
| Dielectric constant |
1MHz |
5.5 |
4.7 |
5.6 |
7.7 |
| 100MHz |
5.4 |
4.7 |
5.5 |
7.3 |
| Dielectric loss |
1MHz |
0.002 |
0.002 |
0.002 |
0.013 |
| 100MHz |
0.003 |
0.003 |
0.003 |
0.017 |
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* JIS R-3502 Powder Method
The data shown in this table are based on our measurement of the materials and do not constitute a guarantee that the materials will have these properties.
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OKAMOTO GLASS Co., Ltd.
Glass Materials
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