| OHARA | S-FPM2 |
595677 597674 |
||||||
| Refractive Index |  |
1.59522 | Abbe Number |  |
67.7 | Dispersion |  |
0.00879 |
| 1.595220 | 67.74 | 0.008787 | ||||||
 |
1.597316 |  |
67.37 |  |
0.008866 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.57252 |
 |
1.97009 | 1.57631 |
 |
1.52958 | 1.58045 |
 |
1.12864 | 1.58426 |
 |
1.01398 | 1.58557 |
 |
0.85211 | 1.58791 |
 |
0.76819 | 1.58954 |
 |
0.70652 | 1.59105 |
 |
0.65627 | 1.59255 |
 |
0.64385 | 1.59298 |
 |
0.6328 | 1.59337 |
 |
0.58929 | 1.59514 |
 |
0.58756 | 1.59522 |
 |
0.54607 | 1.59732 |
 |
0.48613 | 1.60134 |
 |
0.47999 | 1.60184 |
 |
0.44157 | 1.60549 |
 |
0.435835 | 1.60612 |
 |
0.404656 | 1.61008 |
 |
0.365015 | 1.61681 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
571 |
| Yield Point (°C) |
At |
596 |
| Softening Point (°C) |
SP |
|
| Expansion Coefficient   |
-30~+70°C |
117 |
+100~+300°C |
135 |
|
Thermal Conductivity |
k |
0.624 |
Mechanical Properties |
||
Young's Modulus |
E |
757 |
| Rigidity Modulus |
G |
294 |
| Poisson's Ratio |  |
0.287 |
| Knoop Hardness | Hk |
390 [4] |
| Abrasion | Aa |
488 |
Photoelastic Constant |
 |
0.51 |
Partial Dispersions |
|
 |
0.006988 |
 |
0.003015 |
 |
0.002665 |
 |
0.004761 |
 |
0.010904 |
 |
0.004782 |
 |
0.003960 |
 |
0.010681 |
 |
0.007411 |
 |
0.004338 |
 |
0.004528 |
 |
0.014961 |
Deviation of Relative Partial Dispersions |
|
 |
-0.0692 |
 |
-0.0149 |
 |
0.0169 |
 |
0.0123 |
 |
0.0577 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
7.61242785 |  |
 |
7.47033375 | |
 |
9.38928947 | |
 |
3.21174095 |  |
 |
1.40234423 |  |
 |
1.39523530 |  |
1129 ~ 2325 nm |
||
|
||
|
||
|
||
|
||
|
||
|
||
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
2 |
| Weathering Resistance (S) | W(S) |
2 |
| Acid Resistance (S) | SR |
51.3 |
| Phosphate Resistance | PR |
4.1 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
4.17 |
|
| Coloring |  |
36 |
|
 |
31 |
||
Relative Partial Dispersions |
|
 |
0.7953 |
 |
0.3431 |
 |
0.3033 |
 |
0.5418 |
 |
1.2409 |
 |
0.5442 |
 |
0.4507 |
 |
1.2155 |
 |
0.8359 |
 |
0.4893 |
 |
0.5107 |
 |
1.6875 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
0.170 |
|
330 |
0.350 |
|
340 |
0.560 |
|
350 |
0.740 |
|
360 |
0.860 |
|
365 |
||
370 |
0.930 |
|
380 |
0.965 |
|
390 |
0.981 |
|
400 |
0.987 |
|
420 |
0.988 |
|
440 |
0.989 |
|
460 |
0.991 |
|
480 |
0.994 |
|
500 |
0.996 |
|
550 |
0.998 |
|
600 |
0.997 |
|
650 |
0.996 |
|
700 |
0.996 |
|
800 |
0.996 |
|
900 |
0.996 |
|
1000 |
0.997 |
|
1200 |
0.998 |
|
1400 |
0.998 |
|
1600 |
0.998 |
|
1800 |
0.997 |
|
2000 |
0.994 |
|
2200 |
0.991 |
|
2400 |
0.986 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | -5.8 |
-5.5 |
-5.5 |
-5.4 |
-5.3 |
-5.1 |
-4.9 |
|
| -20 ~ 0 | -6.0 |
-5.7 |
-5.7 |
-5.6 |
-5.5 |
-5.3 |
-5.1 |
|
| 0 ~ 20 | -6.1 |
-5.9 |
-5.9 |
-5.8 |
-5.7 |
-5.5 |
-5.2 |
|
| 20 ~ 40 | -6.3 |
-6.1 |
-6.1 |
-6.0 |
-5.9 |
-5.6 |
-5.4 |
|
| 40 ~ 60 | -6.4 |
-6.2 |
-6.1 |
-6.1 |
-5.9 |
-5.7 |
-5.4 |
|
| 60 ~ 80 | -6.5 |
-6.2 |
-6.2 |
-6.1 |
-6.0 |
-5.7 |
-5.5 |
|