| OHARA | S-BAH27 |
702412 706410 |
||||||
| Refractive Index |  |
1.70154 | Abbe Number |  |
41.2 | Dispersion |  |
0.01701 |
| 1.701536 | 41.24 | 0.017012 | ||||||
 |
1.705571 |  |
40.95 |  |
0.017228 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.66253 |
 |
1.97009 | 1.66858 |
 |
1.52958 | 1.67526 |
 |
1.12864 | 1.68160 |
 |
1.01398 | 1.68386 |
 |
0.85211 | 1.68800 |
 |
0.76819 | 1.69094 |
 |
0.70652 | 1.69370 |
 |
0.65627 | 1.69650 |
 |
0.64385 | 1.69729 |
 |
0.6328 | 1.69804 |
 |
0.58929 | 1.70139 |
 |
0.58756 | 1.70154 |
 |
0.54607 | 1.70557 |
 |
0.48613 | 1.71351 |
 |
0.47999 | 1.71452 |
 |
0.44157 | 1.72200 |
 |
0.435835 | 1.72332 |
 |
0.404656 | 1.73180 |
 |
0.365015 | 1.74712 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
611 |
| Annealing Point (°C) |
AP |
636 |
| Transformation Temperature (°C) |
Tg |
647 |
| Yield Point (°C) |
At |
682 |
| Softening Point (°C) |
SP |
749 |
| Expansion Coefficient   |
-30~+70°C |
64 |
+100~+300°C |
75 |
|
Thermal Conductivity |
k |
0.869 |
Mechanical Properties |
||
Young's Modulus |
E |
936 |
| Rigidity Modulus |
G |
368 |
| Poisson's Ratio |  |
0.272 |
| Knoop Hardness | Hk |
580 [6] |
| Abrasion | Aa |
129 |
Photoelastic Constant |
 |
2.18 |
Partial Dispersions |
|
 |
0.012641 |
 |
0.005561 |
 |
0.005033 |
 |
0.009068 |
 |
0.021787 |
 |
0.009808 |
 |
0.008480 |
 |
0.023797 |
 |
0.013433 |
 |
0.008276 |
 |
0.008952 |
 |
0.032597 |
Deviation of Relative Partial Dispersions |
|
 |
0.0029 |
 |
0.0011 |
 |
0.0016 |
 |
0.0018 |
 |
0.0191 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.68939052 | |
 |
1.33081013 |  |
 |
1.41165515 | |
 |
1.03598193 |  |
 |
5.33982239 | |
 |
1.26515503 |  |
1129 ~ 2325 nm |
||
|
1.68939052 | |
|
1.33081013 | |
|
1.41165515 | |
|
1.03598193 | |
|
5.33982239 | |
|
1.26515503 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
3 |
| Weathering Resistance (S) | W(S) |
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 |  |
40 |
|
 |
35 |
||
Relative Partial Dispersions |
|
 |
0.7431 |
 |
0.3269 |
 |
0.2958 |
 |
0.5330 |
 |
1.2807 |
 |
0.5765 |
 |
0.4985 |
 |
1.3988 |
 |
0.7797 |
 |
0.4804 |
 |
0.5196 |
 |
1.8921 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
||
350 |
||
360 |
0.160 |
|
365 |
||
370 |
0.470 |
|
380 |
0.700 |
|
390 |
0.830 |
|
400 |
0.890 |
|
420 |
0.955 |
|
440 |
0.971 |
|
460 |
0.979 |
|
480 |
0.985 |
|
500 |
0.989 |
|
550 |
0.995 |
|
600 |
0.994 |
|
650 |
0.994 |
|
700 |
0.996 |
|
800 |
0.998 |
|
900 |
0.998 |
|
1000 |
0.998 |
|
1200 |
0.998 |
|
1400 |
0.993 |
|
1600 |
0.994 |
|
1800 |
0.987 |
|
2000 |
0.974 |
|
2200 |
0.921 |
|
2400 |
0.810 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 3.2 |
3.7 |
3.7 |
4.0 |
4.2 |
4.8 |
5.5 |
|
| -20 ~ 0 | 3.3 |
3.8 |
3.9 |
4.1 |
4.4 |
5.0 |
5.7 |
|
| 0 ~ 20 | 3.4 |
4.0 |
4.0 |
4.2 |
4.5 |
5.2 |
5.9 |
|
| 20 ~ 40 | 3.5 |
4.1 |
4.1 |
4.4 |
4.7 |
5.4 |
6.2 |
|
| 40 ~ 60 | 3.5 |
4.2 |
4.3 |
4.5 |
4.8 |
5.6 |
6.4 |
|
| 60 ~ 80 | 3.7 |
4.4 |
4.4 |
4.6 |
5.0 |
5.8 |
6.6 |
|