Glass Dynamics, LLC Resource Development Experts. |
SI-UV Ultraviolet Grade fused silica, Grades A and B:
These extremely pure fused silica materials offer good transmittance down into the deep UV. They provide outstanding homogeneity making them ideal for applications demanding superior wavefront performance. As fused silica materials, they show no fluorescence or discoloration when exposed to radiation shorter than 290 nm. S1-UVA has slightly better homogeneity and fewer and smaller bubbles than S1-UVB. Unless otherwise specified, the UV grade optical elements found in this handbook are manufactured out of S1-UVB.
|
Optimum Transmission Range |
Ideal Applications |
|
|
180 nm - 2.0 µm |
Deep UV transmission elements |
|
|
2.9 µm - 3.6 µm |
Minimum scattering systems |
|
| Index of Refraction | |||
|
Wavelength, nm |
Fused Silica/ Quartz |
BK7 |
Sapphire |
|
213.86 |
1.53427 |
- |
- |
|
230.21 |
1.52005 |
- |
- |
|
239.94 |
1.51337 |
- |
- |
|
265.20 |
1.50000 |
- |
1.83360 |
|
280.35 |
1.49403 |
- |
1.82427 |
|
302.15 |
1.48719 |
- |
1.81351 |
|
334.15 |
1.47976 |
- |
1.80184 |
|
346.62 |
1.47746 |
- |
1.79815 |
|
365.02 |
1.47452 |
1.53626 |
1.79358 |
|
404.66 |
1.46962 |
1.53024 |
1.78582 |
|
435.84 |
1.46669 |
1.52669 |
1.78120 |
|
546.07 |
1.46008 |
1.51872 |
1.77078 |
|
706.52 |
1.45516 |
1.51289 |
1.76303 |
|
852.11 |
1.45247 |
1.50981 |
1.75885 |
|
1013.98 |
1.45025 |
1.50731 |
1.75547 |
|
1529.52 |
1.44427 |
1.50094 |
1.74660 |
|
1970.09 |
1.43853 |
1.49500 |
1.73833 |
|
2325.42 |
1.43293 |
1.48929 |
1.73055 |
|
3243.90 |
1.41315 |
- |
1.70437 |
|
3507.00 |
1.40566 |
- |
1.69504 |
|
4954.00 |
- |
- |
1.62665 |
|
5577.00 |
- |
- |
1.58638 |
| Mechanical Properties of Optical Materials | |||||||
| Thermal |
Units |
Fused Quartz |
Fused Silica | BK7 | Pyrex® | Sapphire | |
| Softening Point |
°C |
1180 |
1120 |
550 |
565 |
|
|
| Annealing Point |
°C |
1180 |
1120 |
550 |
565 |
|
|
| Strain Point |
°C |
1075 |
1025 |
624 |
515 |
|
|
| Maximum Temperature (Continuous) |
°C |
1000 |
950 |
350 |
230 |
1100 |
|
| Maximum Temperature (Momentary) |
°C |
1300 |
1200 |
490 |
|
|
|
| Thermal Conductivity | @ 20° C |
cal cm cm2sec°C |
0.0033 |
0.0033 |
0.0026 |
0.0027 |
0.0065 |
| @ 200°C |
0.0037 |
0.0037 |
|
|
|
||
| @ 950° C |
0.0064 |
0.0064 |
|
|
|
||
| Specific Heat | 0°–100° C |
cal g °C |
0.18 |
0.18 |
0.21 |
0.2 |
|
| 0°–900° C |
0.25 |
0.25 |
|
|
|
||
| Coefficient of Thermal Expansion | -50°–0° C |
cm |
2.7 × 10-7 |
2.7 × 10-7 |
|
|
|
| 0°–300° C |
5.9 × 10-7 |
5.9 × 10-7 |
86 × 10-7 |
33 × 10-7 |
|
||
| 0°–900° C |
4.8 × 10-7 |
4.8 × 10-7 |
|
|
90.3 × 10-7 |
||
|
Strength/Hardness |
||||||
| Moh Hardness |
|
5.5–6.5 |
5.5–6.5 |
5 |
|
9 |
| Microhardness |
kg/cm2 |
9.4 × 104 |
9.4 × 104 |
|
|
|
| Knoop Hardness (100g load) |
kg/mm2 |
605 |
615 |
520 |
481 |
1525–2000 |
| Density |
g/cm3 |
2.203 |
2.203 |
|
|
|
| Specific Gravity |
|
2.203 |
2.201 |
2.53 |
2.23 |
3.98 |
| Compressive Stgth |
kg/cm2 |
1.13 × 104 |
1.13 × 104 |
|
2.04 × 104 |
|
| Tensile Strength |
kg/cm2 |
500 |
500 |
|
282 |
7000 |
| Torsional Strgth |
kg/cm2 |
300 |
300 |
|
|
1.5 × 106 |
| Bending Strgth |
kg/cm2 |
680 |
680 |
|
|
|
| Young's Modulus |
kg/cm2 |
7.45 × 105 |
7.45 × 105 |
8.63 × 105 |
7 × 106 |
79 × 105 |
| Shear Modulus |
kg/cm2 |
3.2 × 105 |
3.2 × 105 |
|
|
|
| Bulk Modulus |
kg/cm2 |
3.76 × 105 |
3.76 × 105 |
|
|
|
| Poisson's Ratio |
|
0.17 |
0.17 |
0.208 |
0.2 |
0.02 |
|
Electrical |
|||||||
| Dielectric Strength |
@ 20° C |
kv/cm |
250–400 |
250–400 |
|
|
480 |
|
@ 500° C |
150–200 |
150–200 |
|
|
|
||
|
Dielectric Constant |
(0–1Mhz) |
|
3.7 |
3.7 |
|
5.1 |
8.6–10.6 |
|
Dielectric Loss Tangent |
1 MHz |
|
1 × 10-4 |
1 × 10-4 |
|
2.6 × 10-2 |
|
|
102 MHz |
|
1 × 10-4 |
1 × 10-4 |
|
|
|
|
|
3 × 104 MHz |
4 × 10-4 |
4 × 10-4 |
|
|
|
||
|
Resistivity |
@ 20° C |
Ω/cm |
1 × 1018 |
1 × 1018 |
|
|
|
|
@ 600° C |
8 × 107 |
8 × 107 |
|
|
1 × 1011 |
||
|
@ 1000°C |
1 × 106 |
1 × 106 |
|
|
1 × 106 |
||
|
All properties measured at 20° C unless otherwise specified. |
|||||||
| Striae and Homogeneity | |||
|
Material Code |
Type |
Striae/MIL-G-174A |
Index Variation Δn (x10-6) |
|
S1-UVA |
Fused Silica |
A |
6 |
|
S1-UVB |
Fused Silica |
A |
10 |
|
A1 |
Fused Quartz or Fused Silica |
B |
10 |
|
G1 |
Fused Quartz or Fused Silica |
C-D |
20 |
|
I2-IR |
Fused Quartz |
A |
4 |
|
BK7 |
Optical Glass |
A |
10 |
|
Bubbles & Inclusions |
||||||
|
up to 1.0" dia. |
from 1.0" to 2.0" dia. | from 2.0" to 3.0" dia. | ||||
| ESCO Material |
Max. Dia. |
Max. Qty. |
Max. Dia. |
Max. Qty. |
Max. Dia. |
Max. Qty. |
|
(inches) |
per pc. |
(inches) |
per pc. |
(inches) |
per pc. |
|
| S1-UVA |
0.006 |
0 |
0.008 |
1 |
0.01 |
1 |
| S1-UVB |
0.008 |
1 |
0.015 |
1 |
0.015 |
1 |
| A1 |
0.01 |
1 |
0.015 |
1 |
0.02 |
2 |
| G1 |
0.03 |
3 |
0.04 |
3 |
0.06 |
3 |
| I2-IR |
0.01 |
3 |
0.015 |
3 |
0.02 |
3 |
| BK-7 |
0.006 |
0 |
0.006 |
0 |
0.01 |
1 |
|
* These specifications are worst case conditions. * Materials can be selected and guaranteed to customer's requirements. * Bubbles less than the maximum diameter count as a fraction of the allowed limit. * Bubbles less than 0.004" are regarded as undetectable. |
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Glass Dynamics, LLC
2662 Hance Bridge Road, Vineland, NJ 08361
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