| OHARA | L-BSL7 |
516641 518638 |
||||||
| Refractive Index |  |
1.51633 | Abbe Number |  |
64.1 | Dispersion |  |
0.00806 |
| 1.516330 | 64.06 | 0.008060 | ||||||
 |
1.518250 |  |
63.87 |  |
0.008114 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.48810 |
 |
1.97009 | 1.49404 |
 |
1.52958 | 1.50020 |
 |
1.12864 | 1.50523 |
 |
1.01398 | 1.50677 |
 |
0.85211 | 1.50930 |
 |
0.76819 | 1.51094 |
 |
0.70652 | 1.51241 |
 |
0.65627 | 1.51385 |
 |
0.64385 | 1.51424 |
 |
0.6328 | 1.51462 |
 |
0.58929 | 1.51626 |
 |
0.58756 | 1.51633 |
 |
0.54607 | 1.51825 |
 |
0.48613 | 1.52191 |
 |
0.47999 | 1.52236 |
 |
0.44157 | 1.52564 |
 |
0.435835 | 1.52620 |
 |
0.404656 | 1.52975 |
 |
0.365015 | 1.53574 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
464 |
| Annealing Point (°C) |
AP |
488 |
| Transformation Temperature (°C) |
Tg |
498 |
| Yield Point (°C) |
At |
549 |
| Softening Point (°C) |
SP |
630 |
| Expansion Coefficient   |
-30~+70°C |
58 |
+100~+300°C |
71 |
|
Thermal Conductivity |
k |
1.169 |
Mechanical Properties |
||
Young's Modulus |
E |
793 |
| Rigidity Modulus |
G |
327 |
| Poisson's Ratio |  |
0.214 |
| Knoop Hardness | Hk |
560 [6] |
| Abrasion | Aa |
69 |
Photoelastic Constant |
 |
2.93 |
Partial Dispersions |
|
 |
0.007081 |
 |
0.002904 |
 |
0.002484 |
 |
0.004407 |
 |
0.009874 |
 |
0.004298 |
 |
0.003544 |
 |
0.009541 |
 |
0.007479 |
 |
0.004009 |
 |
0.004105 |
 |
0.013387 |
Deviation of Relative Partial Dispersions |
|
 |
0.0312 |
 |
0.0068 |
 |
-0.0066 |
 |
-0.0045 |
 |
-0.0049 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
9.17473918 |  |
 |
3.52687665 | |
 |
1.05579788 | |
 |
5.27701411 |  |
 |
1.70809497 |  |
 |
1.04302583 |  |
1129 ~ 2325 nm |
||
|
9.17473918 | |
|
3.52687665 | |
|
1.05579788 | |
|
5.27701411 | |
|
1.70809497 | |
|
1.04302583 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
2 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
3 |
| Acid Resistance (S) | SR |
1.0 |
| Phosphate Resistance | PR |
1.2 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
2.38 |
|
| Coloring |  |
33 |
|
 |
30 |
||
Relative Partial Dispersions |
|
 |
0.8785 |
 |
0.3603 |
 |
0.3082 |
 |
0.5468 |
 |
1.2251 |
 |
0.5333 |
 |
0.4397 |
 |
1.1837 |
 |
0.9217 |
 |
0.4941 |
 |
0.5059 |
 |
1.6499 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
0.080 |
|
310 |
0.400 |
|
320 |
0.710 |
|
330 |
0.870 |
|
340 |
0.942 |
|
350 |
0.973 |
|
360 |
0.986 |
|
365 |
||
370 |
0.992 |
|
380 |
0.994 |
|
390 |
0.996 |
|
400 |
0.997 |
|
420 |
0.997 |
|
440 |
0.997 |
|
460 |
0.997 |
|
480 |
0.998 |
|
500 |
0.999 |
|
550 |
0.999 |
|
600 |
0.999 |
|
650 |
0.999 |
|
700 |
0.999 |
|
800 |
0.999 |
|
900 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.974 |
|
1600 |
0.994 |
|
1800 |
0.988 |
|
2000 |
0.974 |
|
2200 |
0.870 |
|
2400 |
0.800 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 4.0 |
4.3 |
4.3 |
4.4 |
4.5 |
4.7 |
4.9 |
|
| -20 ~ 0 | 4.1 |
4.4 |
4.4 |
4.5 |
4.6 |
4.8 |
5.1 |
|
| 0 ~ 20 | 4.1 |
4.5 |
4.5 |
4.6 |
4.7 |
4.9 |
5.2 |
|
| 20 ~ 40 | 4.2 |
4.6 |
4.6 |
4.7 |
4.8 |
5.1 |
5.3 |
|
| 40 ~ 60 | 4.3 |
4.7 |
4.7 |
4.8 |
4.9 |
5.2 |
5.5 |
|
| 60 ~ 80 | 4.4 |
4.7 |
4.8 |
4.9 |
5.0 |
5.3 |
5.6 |
|