| OHARA | S-LAH55V |
835427 839425 |
||||||
| Refractive Index |  |
1.83481 | Abbe Number |  |
42.7 | Dispersion |  |
0.01954 |
| 1.834807 | 42.73 | 0.019539 | ||||||
 |
1.839452 |  |
42.47 |  |
0.019764 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.78870 |
 |
1.97009 | 1.79602 |
 |
1.52958 | 1.80402 |
 |
1.12864 | 1.81154 |
 |
1.01398 | 1.81420 |
 |
0.85211 | 1.81906 |
 |
0.76819 | 1.82250 |
 |
0.70652 | 1.82572 |
 |
0.65627 | 1.82898 |
 |
0.64385 | 1.82990 |
 |
0.6328 | 1.83076 |
 |
0.58929 | 1.83464 |
 |
0.58756 | 1.83481 |
 |
0.54607 | 1.83945 |
 |
0.48613 | 1.84852 |
 |
0.47999 | 1.84966 |
 |
0.44157 | 1.85808 |
 |
0.435835 | 1.85956 |
 |
0.404656 | 1.86893 |
 |
0.365015 | 1.88539 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
645 |
| Annealing Point (°C) |
AP |
672 |
| Transformation Temperature (°C) |
Tg |
695 |
| Yield Point (°C) |
At |
718 |
| Softening Point (°C) |
SP |
749 |
| Expansion Coefficient   |
-30~+70°C |
62 |
+100~+300°C |
77 |
|
Thermal Conductivity |
k |
0.853 |
Mechanical Properties |
||
Young's Modulus |
E |
1178 |
| Rigidity Modulus |
G |
470 |
| Poisson's Ratio |  |
0.253 |
| Knoop Hardness | Hk |
740 [7] |
| Abrasion | Aa |
59 |
Photoelastic Constant |
 |
1.30 |
Partial Dispersions |
|
 |
0.014778 |
 |
0.006476 |
 |
0.005826 |
 |
0.010471 |
 |
0.024749 |
 |
0.011036 |
 |
0.009373 |
 |
0.025830 |
 |
0.015697 |
 |
0.009552 |
 |
0.010212 |
 |
0.035722 |
Deviation of Relative Partial Dispersions |
|
 |
0.0091 |
 |
0.0037 |
 |
-0.0094 |
 |
-0.0075 |
 |
-0.0452 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.97025325 |  |
 |
3.04894140 |  |
 |
1.39214665 | |
 |
9.91088134 |  |
 |
3.83202295 |  |
 |
9.77785249 |  |
1129 ~ 2325 nm |
||
|
||
|
||
|
||
|
||
|
||
|
||
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
3 |
| Weathering Resistance (S) | W(S) |
4 |
| Acid Resistance (S) | SR |
4.0 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
4.73 |
|
| Coloring |  |
400 |
|
 |
325 |
||
Relative Partial Dispersions |
|
 |
0.7563 |
 |
0.3314 |
 |
0.2982 |
 |
0.5359 |
 |
1.2666 |
 |
0.5648 |
 |
0.4797 |
 |
1.3220 |
 |
0.7942 |
 |
0.4833 |
 |
0.5167 |
 |
1.8074 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
0.140 |
|
340 |
0.420 |
|
350 |
0.640 |
|
360 |
0.780 |
|
365 |
||
370 |
0.860 |
|
380 |
0.910 |
|
390 |
0.939 |
|
400 |
0.956 |
|
420 |
0.974 |
|
440 |
0.982 |
|
460 |
0.987 |
|
480 |
0.992 |
|
500 |
0.995 |
|
550 |
0.998 |
|
600 |
0.998 |
|
650 |
0.998 |
|
700 |
0.999 |
|
800 |
0.999 |
|
900 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.997 |
|
1600 |
0.995 |
|
1800 |
0.987 |
|
2000 |
0.966 |
|
2200 |
0.909 |
|
2400 |
0.710 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 3.5 |
4.2 |
4.3 |
4.5 |
4.8 |
5.4 |
6.1 |
|
| -20 ~ 0 | 3.5 |
4.2 |
4.3 |
4.5 |
4.8 |
5.5 |
6.2 |
|
| 0 ~ 20 | 3.5 |
4.2 |
4.3 |
4.5 |
4.8 |
5.5 |
6.3 |
|
| 20 ~ 40 | 3.5 |
4.3 |
4.3 |
4.5 |
4.9 |
5.6 |
6.4 |
|
| 40 ~ 60 | 3.5 |
4.4 |
4.4 |
4.7 |
5.0 |
5.8 |
6.6 |
|
| 60 ~ 80 | 3.7 |
4.5 |
4.6 |
4.9 |
5.2 |
6.0 |
6.8 |
|