| OHARA | S-NBH52 |
673382 677379 |
||||||
| Refractive Index |  |
1.67300 | Abbe Number |  |
38.2 | Dispersion |  |
0.01764 |
| 1.673000 | 38.15 | 0.017642 | ||||||
 |
1.677185 |  |
37.90 |  |
0.017866 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.63291 |
 |
1.97009 | 1.63904 |
 |
1.52958 | 1.64585 |
 |
1.12864 | 1.65237 |
 |
1.01398 | 1.65470 |
 |
0.85211 | 1.65897 |
 |
0.76819 | 1.66202 |
 |
0.70652 | 1.66488 |
 |
0.65627 | 1.66778 |
 |
0.64385 | 1.66860 |
 |
0.6328 | 1.66937 |
 |
0.58929 | 1.67284 |
 |
0.58756 | 1.67300 |
 |
0.54607 | 1.67719 |
 |
0.48613 | 1.68542 |
 |
0.47999 | 1.68647 |
 |
0.44157 | 1.69420 |
 |
0.435835 | 1.69557 |
 |
0.404656 | 1.70432 |
 |
0.365015 | 1.71997 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
486 |
| Annealing Point (°C) |
AP |
510 |
| Transformation Temperature (°C) |
Tg |
520 |
| Yield Point (°C) |
At |
556 |
| Softening Point (°C) |
SP |
646 |
| Expansion Coefficient   |
-30~+70°C |
86 |
+100~+300°C |
109 |
|
Thermal Conductivity |
k |
1.115 |
Mechanical Properties |
||
Young's Modulus |
E |
979 |
| Rigidity Modulus |
G |
396 |
| Poisson's Ratio |  |
0.236 |
| Knoop Hardness | Hk |
590 [6] |
| Abrasion | Aa |
123 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.013084 |
 |
0.005763 |
 |
0.005220 |
 |
0.009405 |
 |
0.022573 |
 |
0.010151 |
 |
0.008743 |
 |
0.024400 |
 |
0.013905 |
 |
0.008584 |
 |
0.009282 |
 |
0.033506 |
Deviation of Relative Partial Dispersions |
|
 |
0.0159 |
 |
0.0046 |
 |
-0.0060 |
 |
-0.0043 |
 |
-0.0225 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.50305799 | |
 |
2.21715926 |  |
 |
1.84496391 | |
 |
9.99021738 |  |
 |
4.50327698 |  |
 |
1.63722302 |  |
1129 ~ 2325 nm |
||
|
||
|
||
|
||
|
||
|
||
|
||
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
4 |
| 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 |
3.09 |
|
| Coloring |  |
36 |
|
 |
32 |
||
Relative Partial Dispersions |
|
 |
0.7416 |
 |
0.3267 |
 |
0.2959 |
 |
0.5331 |
 |
1.2795 |
 |
0.5754 |
 |
0.4956 |
 |
1.3831 |
 |
0.7783 |
 |
0.4805 |
 |
0.5195 |
 |
1.8754 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
0.040 |
|
330 |
0.370 |
|
340 |
0.690 |
|
350 |
0.850 |
|
360 |
0.923 |
|
365 |
||
370 |
0.958 |
|
380 |
0.976 |
|
390 |
0.985 |
|
400 |
0.990 |
|
420 |
0.993 |
|
440 |
0.994 |
|
460 |
0.995 |
|
480 |
0.996 |
|
500 |
0.997 |
|
550 |
0.999 |
|
600 |
0.999 |
|
650 |
0.998 |
|
700 |
0.999 |
|
800 |
0.999 |
|
900 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.996 |
|
1600 |
0.995 |
|
1800 |
0.983 |
|
2000 |
0.971 |
|
2200 |
0.932 |
|
2400 |
0.912 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 3.1 |
3.7 |
3.8 |
4.0 |
4.3 |
4.9 |
5.6 |
|
| -20 ~ 0 | 3.0 |
3.7 |
3.7 |
3.9 |
4.2 |
4.9 |
5.6 |
|
| 0 ~ 20 | 2.9 |
3.7 |
3.7 |
3.9 |
4.2 |
4.9 |
5.7 |
|
| 20 ~ 40 | 2.8 |
3.6 |
3.7 |
3.8 |
4.2 |
5.0 |
5.8 |
|
| 40 ~ 60 | 2.8 |
3.6 |
3.6 |
3.8 |
4.2 |
5.0 |
5.8 |
|
| 60 ~ 80 | 2.7 |
3.5 |
3.6 |
3.8 |
4.2 |
5.0 |
5.9 |
|