| OHARA | BAL15Y |
557587 559585 |
||||||
| Refractive Index |  |
1.55671 | Abbe Number |  |
58.7 | Dispersion |  |
0.00948 |
| 1.556711 | 58.68 | 0.009488 | ||||||
 |
1.558973 |  |
58.41 |  |
0.009569 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.52907 |
 |
1.97009 | 1.53423 |
 |
1.52958 | 1.53972 |
 |
1.12864 | 1.54449 |
 |
1.01398 | 1.54604 |
 |
0.85211 | 1.54872 |
 |
0.76819 | 1.55053 |
 |
0.70652 | 1.55218 |
 |
0.65627 | 1.55383 |
 |
0.64385 | 1.55429 |
 |
0.6328 | 1.55471 |
 |
0.58929 | 1.55663 |
 |
0.58756 | 1.55671 |
 |
0.54607 | 1.55897 |
 |
0.48613 | 1.56331 |
 |
0.47999 | 1.56385 |
 |
0.44157 | 1.56779 |
 |
0.435835 | 1.56848 |
 |
0.404656 | 1.57277 |
 |
0.365015 | 1.58012 |
 |
0.334148 | 1.58807 |
 |
0.326106 | 1.59060 |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
507 |
| Yield Point (°C) |
At |
547 |
| Softening Point (°C) |
SP |
642 |
| Expansion Coefficient   |
-30~+70°C |
76 |
+100~+300°C |
90 |
|
Thermal Conductivity |
k |
1.000 |
Mechanical Properties |
||
Young's Modulus |
E |
783 |
| Rigidity Modulus |
G |
317 |
| Poisson's Ratio |  |
0.236 |
| Knoop Hardness | Hk |
560 [6] |
| Abrasion | Aa |
113 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.007785 |
 |
0.003296 |
 |
0.002885 |
 |
0.005147 |
 |
0.011768 |
 |
0.005165 |
 |
0.004295 |
 |
0.011636 |
 |
0.008244 |
 |
0.004688 |
 |
0.004881 |
 |
0.016261 |
Deviation of Relative Partial Dispersions |
|
 |
-0.0015 |
 |
0.0004 |
 |
-0.0026 |
 |
-0.0021 |
 |
-0.0073 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.28348331 | |
 |
1.02800765 |  |
 |
4.04609885 | |
 |
7.90900515 |  |
 |
3.05971274 |  |
 |
4.65268356 |  |
1129 ~ 2325 nm |
||
|
1.18261390 | |
|
2.03921973 | |
|
1.11763340 | |
|
6.85280751 | |
|
2.50893634 | |
|
1.24101415 |  |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
1~2 |
| Acid Resistance (S) | SR |
1.2 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
2.90 |
|
| Coloring |  |
32 |
|
 |
30 |
||
Relative Partial Dispersions |
|
 |
0.8205 |
 |
0.3474 |
 |
0.3041 |
 |
0.5425 |
 |
1.2403 |
 |
0.5444 |
 |
0.4527 |
 |
1.2264 |
 |
0.8615 |
 |
0.4899 |
 |
0.5101 |
 |
1.6993 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
0.170 |
0.010 |
310 |
0.590 |
0.270 |
320 |
0.840 |
0.650 |
330 |
0.937 |
0.850 |
340 |
0.971 |
0.929 |
350 |
0.985 |
0.963 |
360 |
0.992 |
0.979 |
365 |
0.994 |
0.984 |
370 |
0.995 |
0.988 |
380 |
0.996 |
0.990 |
390 |
0.997 |
0.993 |
400 |
0.998 |
0.994 |
420 |
0.998 |
0.995 |
440 |
0.998 |
0.995 |
460 |
0.998 |
0.996 |
480 |
0.998 |
0.996 |
500 |
0.999 |
0.997 |
550 |
0.999 |
0.997 |
600 |
0.999 |
0.997 |
650 |
0.998 |
0.996 |
700 |
0.999 |
0.997 |
800 |
0.999 |
0.997 |
900 |
0.998 |
0.995 |
1000 |
0.996 |
0.990 |
1200 |
0.995 |
0.988 |
1400 |
0.989 |
0.972 |
1600 |
0.992 |
0.980 |
1800 |
0.984 |
0.961 |
2000 |
0.972 |
0.932 |
2200 |
0.927 |
0.820 |
2400 |
0.890 |
0.750 |
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 2.2 |
2.5 |
2.5 |
2.6 |
2.8 |
3.0 |
3.3 |
4.2 |
| -20 ~ 0 | 2.2 |
2.5 |
2.6 |
2.7 |
2.8 |
3.1 |
3.5 |
4.3 |
| 0 ~ 20 | 2.3 |
2.6 |
2.6 |
2.8 |
2.9 |
3.2 |
3.6 |
4.5 |
| 20 ~ 40 | 2.4 |
2.7 |
2.7 |
2.8 |
3.0 |
3.3 |
3.7 |
4.6 |
| 40 ~ 60 | 2.4 |
2.8 |
2.8 |
2.9 |
3.1 |
3.4 |
3.8 |
4.8 |
| 60 ~ 80 | 2.4 |
2.8 |
2.9 |
3.0 |
3.1 |
3.5 |
3.9 |
4.9 |