| OHARA | L-BAL42 |
583594 585591 |
||||||
| Refractive Index |  |
1.58313 | Abbe Number |  |
59.4 | Dispersion |  |
0.00982 |
| 1.583130 | 59.38 | 0.009820 | ||||||
 |
1.585470 |  |
59.13 |  |
0.009901 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.55402 |
 |
1.97009 | 1.55949 |
 |
1.52958 | 1.56533 |
 |
1.12864 | 1.57038 |
 |
1.01398 | 1.57201 |
 |
0.85211 | 1.57482 |
 |
0.76819 | 1.57671 |
 |
0.70652 | 1.57843 |
 |
0.65627 | 1.58013 |
 |
0.64385 | 1.58061 |
 |
0.6328 | 1.58106 |
 |
0.58929 | 1.58304 |
 |
0.58756 | 1.58313 |
 |
0.54607 | 1.58547 |
 |
0.48613 | 1.58995 |
 |
0.47999 | 1.59051 |
 |
0.44157 | 1.59457 |
 |
0.435835 | 1.59528 |
 |
0.404656 | 1.59969 |
 |
0.365015 | 1.60719 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
467 |
| Annealing Point (°C) |
AP |
494 |
| Transformation Temperature (°C) |
Tg |
506 |
| Yield Point (°C) |
At |
538 |
| Softening Point (°C) |
SP |
607 |
| Expansion Coefficient   |
-30~+70°C |
72 |
+100~+300°C |
88 |
|
Thermal Conductivity |
k |
1.028 |
Mechanical Properties |
||
Young's Modulus |
E |
891 |
| Rigidity Modulus |
G |
357 |
| Poisson's Ratio |  |
0.247 |
| Knoop Hardness | Hk |
590 [6] |
| Abrasion | Aa |
113 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.008122 |
 |
0.003426 |
 |
0.002992 |
 |
0.005334 |
 |
0.012153 |
 |
0.005325 |
 |
0.004412 |
 |
0.011910 |
 |
0.008599 |
 |
0.004857 |
 |
0.005044 |
 |
0.016677 |
Deviation of Relative Partial Dispersions |
|
 |
0.0018 |
 |
0.0010 |
 |
-0.0038 |
 |
-0.0031 |
 |
-0.0150 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.39528097 | |
 |
7.25519520 |  |
 |
1.66335848 | |
 |
1.11862030 | |
 |
-2.46748575 | |
 |
1.67717958 |  |
1129 ~ 2325 nm |
||
|
1.39528097 | |
|
7.25519520 | |
|
1.66335848 | |
|
1.11862030 | |
|
-2.46748575 | |
|
1.67717958 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
2 |
| Acid Resistance (P) | RA(P) |
4 |
| Weathering Resistance (S) | W(S) |
1~2 |
| Acid Resistance (S) | SR |
5.2 |
| Phosphate Resistance | PR |
2.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
3.05 |
|
| Coloring |  |
34 |
|
 |
29 |
||
Relative Partial Dispersions |
|
 |
0.8271 |
 |
0.3489 |
 |
0.3047 |
 |
0.5432 |
 |
1.2376 |
 |
0.5423 |
 |
0.4493 |
 |
1.2128 |
 |
0.8685 |
 |
0.4906 |
 |
0.5094 |
 |
1.6844 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
0.050 |
|
300 |
0.190 |
|
310 |
0.410 |
|
320 |
0.630 |
|
330 |
0.790 |
|
340 |
0.890 |
|
350 |
0.940 |
|
360 |
0.968 |
|
365 |
||
370 |
0.981 |
|
380 |
0.987 |
|
390 |
0.992 |
|
400 |
0.994 |
|
420 |
0.994 |
|
440 |
0.995 |
|
460 |
0.996 |
|
480 |
0.997 |
|
500 |
0.998 |
|
550 |
0.999 |
|
600 |
0.998 |
|
650 |
0.998 |
|
700 |
0.998 |
|
800 |
0.999 |
|
900 |
0.998 |
|
1000 |
||
1200 |
||
1400 |
||
1600 |
||
1800 |
||
2000 |
||
2200 |
||
2400 |
||
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 |
3.2 |
3.3 |
3.4 |
3.8 |
4.1 |
||
| -20 ~ 0 | 3.2 |
3.2 |
3.3 |
3.5 |
3.8 |
4.1 |
||
| 0 ~ 20 | 3.2 |
3.2 |
3.3 |
3.5 |
3.8 |
4.2 |
||
| 20 ~ 40 | 3.2 |
3.2 |
3.3 |
3.5 |
3.8 |
4.2 |
||
| 40 ~ 60 | 3.2 |
3.2 |
3.3 |
3.5 |
3.9 |
4.2 |
||
| 60 ~ 80 | 3.2 |
3.2 |
3.3 |
3.5 |
3.9 |
4.3 |
||