at 200nm - 9.1%; at 588nm - 6.8%;
1200oC (2192oF) - limited time
产 品 说 明
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| Refractive Index | nF (486nm) = 1.4631; nd (588nm) = 1.4585; nC (656nm) = 1.4564 | |
| Reflection Loss | for two surfaces at 200nm - 9.1%; at 588nm - 6.8%; | |
| Birefringence Constant | 3.54 nm/cm | |
| Abbe Constant | 67.8 | |
| Bubbles/Inclusions | none | |
| Fluorescence | Virtually fluorescence free | |
| Impurity Content | Total metallic impurities: approximately 5 ppm | |
| OH- Content | > 1000 ppm | |
| Density | 2.201 g/cm3 | |
| Specific Heat Capacity | 703 J Kg-1K-1 | |
| Thermal Conductivity | 1.38 Wm-1K-1 | |
| Coefficient of Expansion | 0.55 x 10-6 /oC | |
| Softening Point | 1600oC (2912oF) | |
| Annealing Point | 1120oC (2048oF) | |
| Strain Point | 1025oC (1877oF) | |
| Max. Service Temperature | 950oC (1742oF) - continuous 1200oC (2192oF) - limited time | |
| Dielectric Constant | 3.91 at 1kHz | |
| Dielectric Strength | 250-400 kV/cm at 20oC | |
| Young's Modulus | 73 GPa at 25oC | |
| Shear Modulus | 31 GPa at 25oC | |
| Rupture Modulus | 50 MPa at 25oC | |
| Bulk Modulus | 36.9 GPa at 25oC | |
| Apparent Elastic Limit | 55MPa (7980 psi) | |
| Compressive Strength | 1.1 GPa | |
| Tensile Strength | 50 MPa | |
| Poisson Ratio | 0.17 at 25oC | |
| Knoop Hardness | 500 kg/mm2 | |
| Molecular Weight | 28.09 | |
| Class/Structure | Amorphous glass | |
| Chemical Stability | High resistance to water and acids (except hydrofluoric). | |
| 融石英晶体（紫外） | |
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