| OHARA | S-LAH71 |
850323 856320 |
||||||
| Refractive Index |  |
1.85026 | Abbe Number |  |
32.3 | Dispersion |  |
0.02634 |
| 1.850259 | 32.27 | 0.026349 | ||||||
 |
1.856493 |  |
32.00 |  |
0.026744 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.80095 |
 |
1.97009 | 1.80685 |
 |
1.52958 | 1.81380 |
 |
1.12864 | 1.82133 |
 |
1.01398 | 1.82429 |
 |
0.85211 | 1.83004 |
 |
0.76819 | 1.83430 |
 |
0.70652 | 1.83838 |
 |
0.65627 | 1.84259 |
 |
0.64385 | 1.84378 |
 |
0.6328 | 1.84491 |
 |
0.58929 | 1.85003 |
 |
0.58756 | 1.85026 |
 |
0.54607 | 1.85649 |
 |
0.48613 | 1.86893 |
 |
0.47999 | 1.87053 |
 |
0.44157 | 1.88243 |
 |
0.435835 | 1.88456 |
 |
0.404656 | 1.89827 |
 |
0.365015 | |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
656 |
| Annealing Point (°C) |
AP |
685 |
| Transformation Temperature (°C) |
Tg |
707 |
| Yield Point (°C) |
At |
752 |
| Softening Point (°C) |
SP |
802 |
| Expansion Coefficient   |
-30~+70°C |
77 |
+100~+300°C |
91 |
|
Thermal Conductivity |
k |
0.874 |
Mechanical Properties |
||
Young's Modulus |
E |
1100 |
| Rigidity Modulus |
G |
429 |
| Poisson's Ratio |  |
0.281 |
| Knoop Hardness | Hk |
590 [6] |
| Abrasion | Aa |
140 |
Photoelastic Constant |
 |
1.52 |
Partial Dispersions |
|
 |
0.018292 |
 |
0.008288 |
 |
0.007673 |
 |
0.013907 |
 |
0.034299 |
 |
0.015623 |
 |
0.013716 |
 |
|
 |
0.019490 |
 |
0.012709 |
 |
0.014035 |
 |
|
Deviation of Relative Partial Dispersions |
|
 |
-0.0039 |
 |
-0.0005 |
 |
0.0040 |
 |
0.0036 |
 |
|
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.98280031 | |
 |
3.16758450 |  |
 |
2.44472646 | |
 |
1.18987459 |  |
 |
5.27156001 | |
 |
2.13220697 |  |
1129 ~ 2325 nm |
||
|
1.98280031 | |
|
3.16758450 | |
|
2.44472646 | |
|
1.18987459 | |
|
5.27156001 | |
|
2.13220697 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
2 |
| Acid Resistance (S) | SR |
2.0 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
4.36 |
|
| Coloring |  |
42 |
|
 |
37 |
||
Relative Partial Dispersions |
|
 |
0.6942 |
 |
0.3145 |
 |
0.2912 |
 |
0.5278 |
 |
1.3017 |
 |
0.5929 |
 |
0.5206 |
 |
|
 |
0.7288 |
 |
0.4752 |
 |
0.5248 |
 |
|
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
||
350 |
||
360 |
0.010 |
|
365 |
||
370 |
0.110 |
|
380 |
0.290 |
|
390 |
0.490 |
|
400 |
0.650 |
|
420 |
0.830 |
|
440 |
0.913 |
|
460 |
0.945 |
|
480 |
0.963 |
|
500 |
0.976 |
|
550 |
0.992 |
|
600 |
0.995 |
|
650 |
0.995 |
|
700 |
0.997 |
|
800 |
0.998 |
|
900 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.999 |
|
1600 |
0.998 |
|
1800 |
0.993 |
|
2000 |
0.989 |
|
2200 |
0.982 |
|
2400 |
0.959 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 1.9 |
2.9 |
2.9 |
3.3 |
3.7 |
4.7 |
5.8 |
|
| -20 ~ 0 | 2.0 |
3.0 |
3.0 |
3.4 |
3.8 |
4.9 |
6.0 |
|
| 0 ~ 20 | 2.0 |
3.0 |
3.1 |
3.5 |
3.9 |
5.0 |
6.3 |
|
| 20 ~ 40 | 2.0 |
3.1 |
3.2 |
3.6 |
4.1 |
5.2 |
6.5 |
|
| 40 ~ 60 | 2.0 |
3.2 |
3.3 |
3.7 |
4.2 |
5.4 |
6.8 |
|
| 60 ~ 80 | 2.1 |
3.3 |
3.4 |
3.8 |
4.3 |
5.6 |
7.0 |
|