| OHARA | S-FPL51 |
497816 498810 |
||||||
| Refractive Index |  |
1.49700 | Abbe Number |  |
81.6 | Dispersion |  |
0.00609 |
| 1.496999 | 81.54 | 0.006095 | ||||||
 |
1.498455 |  |
81.14 |  |
0.006143 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.47952 |
 |
1.97009 | 1.48269 |
 |
1.52958 | 1.48610 |
 |
1.12864 | 1.48911 |
 |
1.01398 | 1.49010 |
 |
0.85211 | 1.49183 |
 |
0.76819 | 1.49300 |
 |
0.70652 | 1.49407 |
 |
0.65627 | 1.49514 |
 |
0.64385 | 1.49543 |
 |
0.6328 | 1.49571 |
 |
0.58929 | 1.49694 |
 |
0.58756 | 1.49700 |
 |
0.54607 | 1.49845 |
 |
0.48613 | 1.50123 |
 |
0.47999 | 1.50158 |
 |
0.44157 | 1.50407 |
 |
0.435835 | 1.50451 |
 |
0.404656 | 1.50720 |
 |
0.365015 | 1.51176 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
458 |
| Yield Point (°C) |
At |
489 |
| Softening Point (°C) |
SP |
|
| Expansion Coefficient   |
-30~+70°C |
131 |
+100~+300°C |
155 |
|
Thermal Conductivity |
k |
0.780 |
Mechanical Properties |
||
Young's Modulus |
E |
727 |
| Rigidity Modulus |
G |
280 |
| Poisson's Ratio |  |
0.299 |
| Knoop Hardness | Hk |
350 [4] |
| Abrasion | Aa |
449 |
Photoelastic Constant |
 |
0.74 |
Partial Dispersions |
|
 |
0.005033 |
 |
0.002134 |
 |
0.001863 |
 |
0.003319 |
 |
0.007508 |
 |
0.003276 |
 |
0.002698 |
 |
0.007253 |
 |
0.005330 |
 |
0.003022 |
 |
0.003121 |
 |
0.010184 |
Deviation of Relative Partial Dispersions |
|
 |
-0.1035 |
 |
-0.0246 |
 |
0.0364 |
 |
0.0280 |
 |
0.1478 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.17010505 | |
 |
4.75710783 |  |
 |
7.63832445 |  |
 |
6.16203924 |  |
 |
2.63372876 | |
 |
1.41882642 |  |
1129 ~ 2325 nm |
||
|
1.17010505 | |
|
4.75710783 | |
|
7.63832445 | |
|
6.16203924 | |
|
2.63372876 | |
|
1.41882642 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
4 |
| Weathering Resistance (S) | W(S) |
1 |
| Acid Resistance (S) | SR |
52.1 |
| Phosphate Resistance | PR |
4.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
3.62 |
|
| Coloring |  |
34 |
|
 |
29 |
||
Relative Partial Dispersions |
|
 |
0.8258 |
 |
0.3501 |
 |
0.3057 |
 |
0.5445 |
 |
1.2318 |
 |
0.5375 |
 |
0.4427 |
 |
1.1900 |
 |
0.8677 |
 |
0.4919 |
 |
0.5081 |
 |
1.6578 |
Internal Transmittance |
||
 |
 |
 |
280 |
0.010 |
|
290 |
0.050 |
|
300 |
0.170 |
|
310 |
0.370 |
|
320 |
0.600 |
|
330 |
0.770 |
|
340 |
0.880 |
|
350 |
0.947 |
|
360 |
0.975 |
|
365 |
||
370 |
0.988 |
|
380 |
0.994 |
|
390 |
0.996 |
|
400 |
0.995 |
|
420 |
0.994 |
|
440 |
0.994 |
|
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 |
0.999 |
|
1000 |
0.999 |
|
1200 |
0.999 |
|
1400 |
0.999 |
|
1600 |
0.999 |
|
1800 |
0.999 |
|
2000 |
0.999 |
|
2200 |
0.997 |
|
2400 |
0.996 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | -5.7 |
-5.5 |
-5.5 |
-5.4 |
-5.4 |
-5.3 |
-5.1 |
|
| -20 ~ 0 | -5.9 |
-5.8 |
-5.7 |
-5.7 |
-5.6 |
-5.5 |
-5.3 |
|
| 0 ~ 20 | -6.2 |
-6.0 |
-6.0 |
-5.9 |
-5.8 |
-5.7 |
-5.5 |
|
| 20 ~ 40 | -6.4 |
-6.2 |
-6.2 |
-6.2 |
-6.1 |
-5.9 |
-5.8 |
|
| 40 ~ 60 | -6.7 |
-6.5 |
-6.5 |
-6.4 |
-6.3 |
-6.1 |
-6.0 |
|
| 60 ~ 80 | -6.9 |
-6.7 |
-6.7 |
-6.7 |
-6.6 |
-6.4 |
-6.2 |
|