| OHARA | S-BAH28 |
723380 728377 |
||||||
| Refractive Index |  |
1.72342 | Abbe Number |  |
38.0 | Dispersion |  |
0.01906 |
| 1.723420 | 37.95 | 0.019060 | ||||||
 |
1.727935 |  |
37.68 |  |
0.019320 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.68198 |
 |
1.97009 | 1.68808 |
 |
1.52958 | 1.69490 |
 |
1.12864 | 1.70154 |
 |
1.01398 | 1.70396 |
 |
0.85211 | 1.70844 |
 |
0.76819 | 1.71167 |
 |
0.70652 | 1.71471 |
 |
0.65627 | 1.71782 |
 |
0.64385 | 1.71870 |
 |
0.6328 | 1.71952 |
 |
0.58929 | 1.72325 |
 |
0.58756 | 1.72342 |
 |
0.54607 | 1.72794 |
 |
0.48613 | 1.73688 |
 |
0.47999 | 1.73802 |
 |
0.44157 | 1.74649 |
 |
0.435835 | 1.74800 |
 |
0.404656 | 1.75769 |
 |
0.365015 | |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
599 |
| Annealing Point (°C) |
AP |
626 |
| Transformation Temperature (°C) |
Tg |
643 |
| Yield Point (°C) |
At |
676 |
| Softening Point (°C) |
SP |
739 |
| Expansion Coefficient   |
-30~+70°C |
66 |
+100~+300°C |
73 |
|
Thermal Conductivity |
k |
0.889 |
Mechanical Properties |
||
Young's Modulus |
E |
911 |
| Rigidity Modulus |
G |
375 |
| Poisson's Ratio |  |
0.213 |
| Knoop Hardness | Hk |
600 [6] |
| Abrasion | Aa |
138 |
Photoelastic Constant |
 |
2.31 |
Partial Dispersions |
|
 |
0.013857 |
 |
0.006146 |
 |
0.005604 |
 |
0.010119 |
 |
0.024580 |
 |
0.011124 |
 |
0.009689 |
 |
|
 |
0.014736 |
 |
0.009240 |
 |
0.010080 |
 |
|
Deviation of Relative Partial Dispersions |
|
 |
0.0023 |
 |
0.0006 |
 |
0.0037 |
 |
0.0035 |
 |
|
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.69493484 | |
 |
1.92890298 |  |
 |
1.56385948 | |
 |
1.02723190 |  |
 |
5.21187640 | |
 |
1.37818035 |  |
1129 ~ 2325 nm |
||
|
1.69493484 | |
|
1.92890298 | |
|
1.56385948 | |
|
1.02723190 | |
|
5.21187640 | |
|
1.37818035 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
3 |
| Weathering Resistance (S) | W(S) |
1~2 |
| Acid Resistance (S) | SR |
4.0 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
3.67 |
|
| Coloring |  |
42 |
|
 |
36 |
||
Relative Partial Dispersions |
|
 |
0.7270 |
 |
0.3225 |
 |
0.2940 |
 |
0.5309 |
 |
1.2896 |
 |
0.5836 |
 |
0.5083 |
 |
|
 |
0.7627 |
 |
0.4783 |
 |
0.5217 |
 |
|
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
||
350 |
||
360 |
0.060 |
|
365 |
||
370 |
0.320 |
|
380 |
0.580 |
|
390 |
0.750 |
|
400 |
0.850 |
|
420 |
0.934 |
|
440 |
0.963 |
|
460 |
0.975 |
|
480 |
0.982 |
|
500 |
0.987 |
|
550 |
0.994 |
|
600 |
0.995 |
|
650 |
0.995 |
|
700 |
0.996 |
|
800 |
0.998 |
|
900 |
0.998 |
|
1000 |
0.998 |
|
1200 |
0.998 |
|
1400 |
0.994 |
|
1600 |
0.995 |
|
1800 |
0.990 |
|
2000 |
0.979 |
|
2200 |
0.938 |
|
2400 |
0.840 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 3.8 |
4.5 |
4.5 |
4.8 |
5.1 |
5.8 |
6.6 |
|
| -20 ~ 0 | 3.9 |
4.6 |
4.7 |
4.9 |
5.3 |
6.0 |
6.9 |
|
| 0 ~ 20 | 4.0 |
4.8 |
4.8 |
5.1 |
5.4 |
6.2 |
7.1 |
|
| 20 ~ 40 | 4.1 |
4.9 |
5.0 |
5.2 |
5.6 |
6.5 |
7.4 |
|
| 40 ~ 60 | 4.2 |
5.1 |
5.1 |
5.4 |
5.8 |
6.7 |
7.7 |
|
| 60 ~ 80 | 4.3 |
5.2 |
5.3 |
5.6 |
6.0 |
6.9 |
7.9 |
|