| OHARA | S-FPL51Y |
497811 498808 |
||||||
| Refractive Index |  |
1.49700 | Abbe Number |  |
81.1 | Dispersion |  |
0.00613 |
| 1.497003 | 81.14 | 0.006125 | ||||||
 |
1.498466 |  |
80.74 |  |
0.006174 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.47980 |
 |
1.97009 | 1.48286 |
 |
1.52958 | 1.48617 |
 |
1.12864 | 1.48913 |
 |
1.01398 | 1.49011 |
 |
0.85211 | 1.49182 |
 |
0.76819 | 1.49299 |
 |
0.70652 | 1.49407 |
 |
0.65627 | 1.49513 |
 |
0.64385 | 1.49543 |
 |
0.6328 | 1.49571 |
 |
0.58929 | 1.49695 |
 |
0.58756 | 1.49700 |
 |
0.54607 | 1.49847 |
 |
0.48613 | 1.50126 |
 |
0.47999 | 1.50160 |
 |
0.44157 | 1.50412 |
 |
0.435835 | 1.50455 |
 |
0.404656 | 1.50727 |
 |
0.365015 | 1.51185 |
 |
0.334148 | 1.51673 |
 |
0.326106 | 1.51826 |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
448 |
| Yield Point (°C) |
At |
471 |
| Softening Point (°C) |
SP |
|
| Expansion Coefficient   |
-30~+70°C |
136 |
+100~+300°C |
161 |
|
Thermal Conductivity |
k |
0.780 |
Mechanical Properties |
||
Young's Modulus |
E |
716 |
| Rigidity Modulus |
G |
275 |
| Poisson's Ratio |  |
0.302 |
| Knoop Hardness | Hk |
380 [4] |
| Abrasion | Aa |
476 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.005027 |
 |
0.002139 |
 |
0.001870 |
 |
0.003333 |
 |
0.007551 |
 |
0.003296 |
 |
0.002716 |
 |
0.007300 |
 |
0.005325 |
 |
0.003035 |
 |
0.003139 |
 |
0.010249 |
Deviation of Relative Partial Dispersions |
|
 |
-0.1067 |
 |
-0.0251 |
 |
0.0366 |
 |
0.0279 |
 |
0.1462 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.14031443 | |
 |
7.71496272 |  |
 |
1.43721957 | |
 |
5.95466872 |  |
 |
2.23953953 | |
 |
2.74290057 |  |
1129 ~ 2325 nm |
||
|
7.65663766 |  |
|
4.51879777 | |
|
1.13199134 | |
|
3.48152533 | |
|
1.28720516 | |
|
2.14351131 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
4 |
| Weathering Resistance (S) | W(S) |
2~3 |
| Acid Resistance (S) | SR |
51.0 |
| Phosphate Resistance | PR |
4.2 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
3.66 |
|
| Coloring |  |
31 |
|
 |
|||
Relative Partial Dispersions |
|
 |
0.8207 |
 |
0.3492 |
 |
0.3053 |
 |
0.5442 |
 |
1.2328 |
 |
0.5381 |
 |
0.4434 |
 |
1.1918 |
 |
0.8625 |
 |
0.4916 |
 |
0.5084 |
 |
1.6600 |
Internal Transmittance |
||
 |
 |
 |
280 |
0.510 |
0.190 |
290 |
0.670 |
0.370 |
300 |
0.800 |
0.580 |
310 |
0.890 |
0.750 |
320 |
0.943 |
0.860 |
330 |
0.971 |
0.930 |
340 |
0.986 |
0.966 |
350 |
0.994 |
0.985 |
360 |
0.996 |
0.991 |
365 |
0.997 |
0.993 |
370 |
0.998 |
0.995 |
380 |
0.999 |
0.997 |
390 |
0.999 |
0.998 |
400 |
0.999 |
0.998 |
420 |
0.999 |
0.998 |
440 |
0.999 |
0.998 |
460 |
0.999 |
0.998 |
480 |
0.999 |
0.998 |
500 |
0.999 |
0.999 |
550 |
0.999 |
0.999 |
600 |
0.999 |
0.999 |
650 |
0.999 |
0.998 |
700 |
0.999 |
0.999 |
800 |
0.999 |
0.999 |
900 |
0.999 |
0.998 |
1000 |
0.998 |
0.996 |
1200 |
0.998 |
0.996 |
1400 |
0.999 |
0.998 |
1600 |
0.999 |
0.997 |
1800 |
0.998 |
0.995 |
2000 |
0.998 |
0.995 |
2200 |
0.996 |
0.991 |
2400 |
0.995 |
0.987 |
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | -6.4 |
-6.3 |
-6.3 |
-6.3 |
-6.2 |
-6.0 |
-5.9 |
-5.5 |
| -20 ~ 0 | -6.7 |
-6.6 |
-6.6 |
-6.5 |
-6.4 |
-6.3 |
-6.1 |
-5.7 |
| 0 ~ 20 | -6.9 |
-6.8 |
-6.8 |
-6.7 |
-6.7 |
-6.5 |
-6.4 |
-5.9 |
| 20 ~ 40 | -7.2 |
-7.0 |
-7.0 |
-7.0 |
-6.9 |
-6.7 |
-6.6 |
-6.1 |
| 40 ~ 60 | -7.4 |
-7.3 |
-7.3 |
-7.2 |
-7.1 |
-7.0 |
-6.8 |
-6.3 |
| 60 ~ 80 | -7.7 |
-7.5 |
-7.5 |
-7.4 |
-7.4 |
-7.2 |
-7.0 |
-6.6 |