| OHARA | S-NBH53 |
738323 743320 |
||||||
| Refractive Index |  |
1.73800 | Abbe Number |  |
32.3 | Dispersion |  |
0.02287 |
| 1.738000 | 32.26 | 0.022876 | ||||||
 |
1.743413 |  |
32.03 |  |
0.023207 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.69016 |
 |
1.97009 | 1.69693 |
 |
1.52958 | 1.70457 |
 |
1.12864 | 1.71215 |
 |
1.01398 | 1.71496 |
 |
0.85211 | 1.72021 |
 |
0.76819 | 1.72401 |
 |
0.70652 | 1.72762 |
 |
0.65627 | 1.73131 |
 |
0.64385 | 1.73236 |
 |
0.6328 | 1.73334 |
 |
0.58929 | 1.73780 |
 |
0.58756 | 1.73800 |
 |
0.54607 | 1.74341 |
 |
0.48613 | 1.75418 |
 |
0.47999 | 1.75556 |
 |
0.44157 | 1.76585 |
 |
0.435835 | 1.76768 |
 |
0.404656 | 1.77951 |
 |
0.365015 | 1.80125 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
527 |
| Annealing Point (°C) |
AP |
547 |
| Transformation Temperature (°C) |
Tg |
578 |
| Yield Point (°C) |
At |
620 |
| Softening Point (°C) |
SP |
688 |
| Expansion Coefficient   |
-30~+70°C |
69 |
+100~+300°C |
89 |
|
Thermal Conductivity |
k |
1.117 |
Mechanical Properties |
||
Young's Modulus |
E |
1031 |
| Rigidity Modulus |
G |
417 |
| Poisson's Ratio |  |
0.236 |
| Knoop Hardness | Hk |
600 [6] |
| Abrasion | Aa |
114 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.016351 |
 |
0.007295 |
 |
0.006691 |
 |
0.012104 |
 |
0.029679 |
 |
0.013494 |
 |
0.011832 |
 |
0.033567 |
 |
0.017398 |
 |
0.011057 |
 |
0.012150 |
 |
0.045683 |
Deviation of Relative Partial Dispersions |
|
 |
0.0168 |
 |
0.0040 |
 |
-0.0003 |
 |
0.0006 |
 |
0.0124 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.65828340 | |
 |
2.63275666 |  |
 |
2.10142759 | |
 |
1.13872516 |  |
 |
5.22108137 | |
 |
1.65523649 |  |
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 |
3.28 |
|
| Coloring |  |
39 |
|
 |
33 |
||
Relative Partial Dispersions |
|
 |
0.7148 |
 |
0.3189 |
 |
0.2925 |
 |
0.5291 |
 |
1.2974 |
 |
0.5899 |
 |
0.5172 |
 |
1.4673 |
 |
0.7497 |
 |
0.4765 |
 |
0.5235 |
 |
1.9685 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
0.030 |
|
340 |
0.170 |
|
350 |
0.520 |
|
360 |
0.740 |
|
365 |
||
370 |
0.850 |
|
380 |
0.915 |
|
390 |
0.947 |
|
400 |
0.965 |
|
420 |
0.981 |
|
440 |
0.986 |
|
460 |
0.988 |
|
480 |
0.991 |
|
500 |
0.993 |
|
550 |
0.997 |
|
600 |
0.997 |
|
650 |
0.997 |
|
700 |
0.998 |
|
800 |
0.999 |
|
900 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.996 |
|
1600 |
0.996 |
|
1800 |
0.990 |
|
2000 |
0.985 |
|
2200 |
0.952 |
|
2400 |
0.949 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 4.1 |
4.9 |
5.0 |
5.3 |
5.6 |
6.4 |
7.4 |
|
| -20 ~ 0 | 4.1 |
5.0 |
5.0 |
5.3 |
5.7 |
6.6 |
7.6 |
|
| 0 ~ 20 | 4.1 |
5.0 |
5.1 |
5.4 |
5.8 |
6.7 |
7.8 |
|
| 20 ~ 40 | 4.1 |
5.1 |
5.2 |
5.5 |
5.9 |
6.9 |
8.0 |
|
| 40 ~ 60 | 4.2 |
5.2 |
5.2 |
5.5 |
6.0 |
7.0 |
8.2 |
|
| 60 ~ 80 | 4.2 |
5.2 |
5.3 |
5.6 |
6.1 |
7.2 |
8.4 |
|