| OHARA | BAL35Y |
589612 591610 |
||||||
| Refractive Index |  |
1.58913 | Abbe Number |  |
61.2 | Dispersion |  |
0.00962 |
| 1.589130 | 61.23 | 0.009621 | ||||||
 |
1.591426 |  |
60.99 |  |
0.009697 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.55937 |
 |
1.97009 | 1.56517 |
 |
1.52958 | 1.57128 |
 |
1.12864 | 1.57646 |
 |
1.01398 | 1.57811 |
 |
0.85211 | 1.58093 |
 |
0.76819 | 1.58280 |
 |
0.70652 | 1.58451 |
 |
0.65627 | 1.58619 |
 |
0.64385 | 1.58666 |
 |
0.6328 | 1.58710 |
 |
0.58929 | 1.58904 |
 |
0.58756 | 1.58913 |
 |
0.54607 | 1.59143 |
 |
0.48613 | 1.59581 |
 |
0.47999 | 1.59636 |
 |
0.44157 | 1.60032 |
 |
0.435835 | 1.60100 |
 |
0.404656 | 1.60530 |
 |
0.365015 | 1.61261 |
 |
0.334148 | 1.62045 |
 |
0.326106 | 1.62293 |
Thermal Properties |
||
| Strain Point (°C) |
StP |
|
| Annealing Point (°C) |
AP |
|
| Transformation Temperature (°C) |
Tg |
590 |
| Yield Point (°C) |
At |
628 |
| Softening Point (°C) |
SP |
697 |
| Expansion Coefficient   |
-30~+70°C |
57 |
+100~+300°C |
72 |
|
Thermal Conductivity |
k |
0.991 |
Mechanical Properties |
||
Young's Modulus |
E |
881 |
| Rigidity Modulus |
G |
354 |
| Poisson's Ratio |  |
0.244 |
| Knoop Hardness | Hk |
550 [6] |
| Abrasion | Aa |
118 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.008076 |
 |
0.003385 |
 |
0.002940 |
 |
0.005236 |
 |
0.011874 |
 |
0.005193 |
 |
0.004298 |
 |
0.011602 |
 |
0.008545 |
 |
0.004767 |
 |
0.004930 |
 |
0.016250 |
Deviation of Relative Partial Dispersions |
|
 |
0.0054 |
 |
0.0017 |
 |
-0.0034 |
 |
-0.0026 |
 |
-0.0064 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.26231429 | |
 |
2.25154210 |  |
 |
6.39119345 | |
 |
6.95586355 |  |
 |
2.21310699 |  |
 |
6.31662736 |  |
1129 ~ 2325 nm |
||
|
1.09972335 | |
|
3.87872537 | |
|
1.11247378 | |
|
5.82303457 | |
|
1.88745144 | |
|
1.08214962 |  |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
2 |
| Acid Resistance (P) | RA(P) |
3 |
| Weathering Resistance (S) | W(S) |
2~3 |
| Acid Resistance (S) | SR |
4.2 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
3.23 |
|
| Coloring |  |
32 |
|
 |
29 |
||
Relative Partial Dispersions |
|
 |
0.8394 |
 |
0.3518 |
 |
0.3056 |
 |
0.5442 |
 |
1.2342 |
 |
0.5398 |
 |
0.4467 |
 |
1.2059 |
 |
0.8812 |
 |
0.4916 |
 |
0.5084 |
 |
1.6758 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
0.110 |
|
300 |
0.500 |
0.170 |
310 |
0.790 |
0.560 |
320 |
0.920 |
0.810 |
330 |
0.966 |
0.918 |
340 |
0.984 |
0.960 |
350 |
0.991 |
0.978 |
360 |
0.994 |
0.986 |
365 |
0.996 |
0.990 |
370 |
0.996 |
0.991 |
380 |
0.997 |
0.993 |
390 |
0.998 |
0.995 |
400 |
0.998 |
0.996 |
420 |
0.999 |
0.997 |
440 |
0.999 |
0.997 |
460 |
0.999 |
0.997 |
480 |
0.999 |
0.998 |
500 |
0.999 |
0.998 |
550 |
0.999 |
0.998 |
600 |
0.999 |
0.998 |
650 |
0.999 |
0.998 |
700 |
0.999 |
0.998 |
800 |
0.999 |
0.998 |
900 |
0.999 |
0.997 |
1000 |
0.997 |
0.993 |
1200 |
0.997 |
0.993 |
1400 |
0.985 |
0.963 |
1600 |
0.993 |
0.982 |
1800 |
0.986 |
0.966 |
2000 |
0.973 |
0.934 |
2200 |
0.904 |
0.770 |
2400 |
0.820 |
0.610 |
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 3.2 |
3.4 |
3.4 |
3.5 |
3.7 |
3.9 |
4.2 |
4.9 |
| -20 ~ 0 | 3.2 |
3.5 |
3.5 |
3.6 |
3.8 |
4.0 |
4.3 |
5.0 |
| 0 ~ 20 | 3.3 |
3.6 |
3.6 |
3.7 |
3.9 |
4.2 |
4.4 |
5.2 |
| 20 ~ 40 | 3.3 |
3.7 |
3.7 |
3.9 |
4.0 |
4.3 |
4.6 |
5.4 |
| 40 ~ 60 | 3.4 |
3.8 |
3.8 |
4.0 |
4.1 |
4.4 |
4.7 |
5.6 |
| 60 ~ 80 | 3.5 |
3.9 |
3.9 |
4.1 |
4.2 |
4.5 |
4.9 |
5.7 |