| OHARA | L-LAH84 |
809404 813402 |
||||||
| Refractive Index |  |
1.80860 | Abbe Number |  |
40.4 | Dispersion |  |
0.02001 |
| 1.808600 | 40.42 | 0.020004 | ||||||
 |
1.813352 |  |
40.17 |  |
0.020247 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.76414 |
 |
1.97009 | 1.77076 |
 |
1.52958 | 1.77809 |
 |
1.12864 | 1.78523 |
 |
1.01398 | 1.78783 |
 |
0.85211 | 1.79265 |
 |
0.76819 | 1.79610 |
 |
0.70652 | 1.79935 |
 |
0.65627 | 1.80266 |
 |
0.64385 | 1.80360 |
 |
0.6328 | 1.80447 |
 |
0.58929 | 1.80842 |
 |
0.58756 | 1.80860 |
 |
0.54607 | 1.81335 |
 |
0.48613 | 1.82267 |
 |
0.47999 | 1.82384 |
 |
0.44157 | 1.83252 |
 |
0.435835 | 1.83405 |
 |
0.404656 | 1.84379 |
 |
0.365015 | 1.86089 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
527 |
| Yield Point (°C) |
At |
568 |
| Softening Point (°C) |
SP |
|
| Expansion Coefficient   |
-30~+70°C |
64 |
+100~+300°C |
79 |
|
Thermal Conductivity |
k |
0.875 |
Mechanical Properties |
||
Young's Modulus |
E |
1116 |
| Rigidity Modulus |
G |
428 |
| Poisson's Ratio |  |
0.303 |
| Knoop Hardness | Hk |
610 [6] |
| Abrasion | Aa |
78 |
Photoelastic Constant |
 |
2.35 |
Partial Dispersions |
|
 |
0.014833 |
 |
0.006559 |
 |
0.005939 |
 |
0.010691 |
 |
0.025449 |
 |
0.011384 |
 |
0.009709 |
 |
0.026840 |
 |
0.015767 |
 |
0.009757 |
 |
0.010490 |
 |
0.037047 |
Deviation of Relative Partial Dispersions |
|
 |
0.0052 |
 |
0.0031 |
 |
-0.0086 |
 |
-0.0070 |
 |
-0.0449 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.86267109 | |
 |
3.15564131 |  |
 |
1.30716934 | |
 |
1.01627115 |  |
 |
3.94096655 | |
 |
1.03774464 |  |
1129 ~ 2325 nm |
||
|
1.86267109 | |
|
3.15564131 | |
|
1.30716934 | |
|
1.01627115 | |
|
3.94096655 | |
|
1.03774464 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
3 |
| Weathering Resistance (S) | W(S) |
2 |
| Acid Resistance (S) | SR |
51.3 |
| Phosphate Resistance | PR |
2.2 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
4.62 |
|
| Coloring |  |
40 |
|
 |
34 |
||
Relative Partial Dispersions |
|
 |
0.7415 |
 |
0.3279 |
 |
0.2969 |
 |
0.5344 |
 |
1.2722 |
 |
0.5691 |
 |
0.4854 |
 |
1.3417 |
 |
0.7787 |
 |
0.4819 |
 |
0.5181 |
 |
1.8298 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
0.200 |
|
350 |
0.540 |
|
360 |
0.760 |
|
365 |
||
370 |
0.870 |
|
380 |
0.922 |
|
390 |
0.950 |
|
400 |
0.965 |
|
420 |
0.979 |
|
440 |
0.985 |
|
460 |
0.990 |
|
480 |
0.993 |
|
500 |
0.996 |
|
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 |
0.998 |
|
1600 |
0.997 |
|
1800 |
0.992 |
|
2000 |
0.975 |
|
2200 |
0.942 |
|
2400 |
0.790 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 7.2 |
8.1 |
8.1 |
8.4 |
8.7 |
9.6 |
10.4 |
|
| -20 ~ 0 | 7.1 |
8.1 |
8.1 |
8.4 |
8.8 |
9.7 |
10.6 |
|
| 0 ~ 20 | 7.1 |
8.1 |
8.2 |
8.5 |
8.7 |
9.8 |
10.7 |
|
| 20 ~ 40 | 7.1 |
8.1 |
8.2 |
8.5 |
8.9 |
9.8 |
10.8 |
|
| 40 ~ 60 | 7.2 |
8.2 |
8.3 |
8.6 |
9.0 |
10.0 |
11.0 |
|
| 60 ~ 80 | 7.3 |
8.4 |
8.5 |
8.8 |
9.3 |
10.3 |
11.3 |
|