| OHARA | S-NBH55 |
800299 806296 |
||||||
| Refractive Index |  |
1.80000 | Abbe Number |  |
29.9 | Dispersion |  |
0.02680 |
| 1.800000 | 29.84 | 0.026806 | ||||||
 |
1.806331 |  |
29.61 |  |
0.027232 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.74989 |
 |
1.97009 | 1.75600 |
 |
1.52958 | 1.76316 |
 |
1.12864 | 1.77082 |
 |
1.01398 | 1.77381 |
 |
0.85211 | 1.77959 |
 |
0.76819 | 1.78388 |
 |
0.70652 | 1.78799 |
 |
0.65627 | 1.79224 |
 |
0.64385 | 1.79345 |
 |
0.6328 | 1.79459 |
 |
0.58929 | 1.79977 |
 |
0.58756 | 1.80000 |
 |
0.54607 | 1.80633 |
 |
0.48613 | 1.81904 |
 |
0.47999 | 1.82068 |
 |
0.44157 | 1.83297 |
 |
0.435835 | 1.83517 |
 |
0.404656 | 1.84951 |
 |
0.365015 | |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
613 |
| Yield Point (°C) |
At |
663 |
| Softening Point (°C) |
SP |
|
| Expansion Coefficient   |
-30~+70°C |
82 |
+100~+300°C |
90 |
|
Thermal Conductivity |
k |
0.994 |
Mechanical Properties |
||
Young's Modulus |
E |
1053 |
| Rigidity Modulus |
G |
415 |
| Poisson's Ratio |  |
0.269 |
| Knoop Hardness | Hk |
560 [6] |
| Abrasion | Aa |
143 |
Photoelastic Constant |
 |
2.50 |
Partial Dispersions |
|
 |
0.018427 |
 |
0.008355 |
 |
0.007763 |
 |
0.014094 |
 |
0.035172 |
 |
0.016129 |
 |
0.014338 |
 |
|
 |
0.019637 |
 |
0.012884 |
 |
0.014348 |
 |
|
Deviation of Relative Partial Dispersions |
|
 |
0.0007 |
 |
-0.0003 |
 |
0.0094 |
 |
0.0085 |
 |
|
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.83145156 | |
 |
2.87818024 |  |
 |
2.15208300 | |
 |
1.22443139 |  |
 |
5.73877310 | |
 |
1.86099124 |  |
1129 ~ 2325 nm |
||
|
||
|
||
|
||
|
||
|
||
|
||
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
2 |
| Acid Resistance (S) | SR |
1.0 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
3.68 |
|
| Coloring |  |
44 |
|
 |
36 |
||
Relative Partial Dispersions |
|
 |
0.6874 |
 |
0.3117 |
 |
0.2896 |
 |
0.5258 |
 |
1.3121 |
 |
0.6017 |
 |
0.5349 |
 |
|
 |
0.7211 |
 |
0.4731 |
 |
0.5269 |
 |
|
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
||
350 |
||
360 |
0.040 |
|
365 |
||
370 |
0.340 |
|
380 |
0.630 |
|
390 |
0.780 |
|
400 |
0.860 |
|
420 |
0.931 |
|
440 |
0.958 |
|
460 |
0.970 |
|
480 |
0.978 |
|
500 |
0.983 |
|
550 |
0.992 |
|
600 |
0.995 |
|
650 |
0.995 |
|
700 |
0.997 |
|
800 |
0.998 |
|
900 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.997 |
|
1600 |
0.996 |
|
1800 |
0.991 |
|
2000 |
0.985 |
|
2200 |
0.969 |
|
2400 |
0.943 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 2.9 |
3.8 |
3.9 |
4.2 |
4.7 |
5.7 |
7.0 |
|
| -20 ~ 0 | 2.8 |
3.9 |
3.9 |
4.3 |
4.8 |
5.9 |
7.2 |
|
| 0 ~ 20 | 2.8 |
3.9 |
4.0 |
4.3 |
4.8 |
6.1 |
7.4 |
|
| 20 ~ 40 | 2.8 |
3.9 |
4.0 |
4.4 |
4.9 |
6.2 |
7.6 |
|
| 40 ~ 60 | 2.8 |
4.0 |
4.0 |
4.4 |
5.0 |
6.3 |
7.8 |
|
| 60 ~ 80 | 2.9 |
4.1 |
4.2 |
4.6 |
5.2 |
6.6 |
8.2 |
|