| OHARA | L-BAL35 |
589612 591609 |
||||||
| Refractive Index |  |
1.58913 | Abbe Number |  |
61.2 | Dispersion |  |
0.00963 |
| 1.589130 | 61.15 | 0.009634 | ||||||
 |
1.591430 |  |
60.93 |  |
0.009706 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.55775 |
 |
1.97009 | 1.56407 |
 |
1.52958 | 1.57069 |
 |
1.12864 | 1.57622 |
 |
1.01398 | 1.57795 |
 |
0.85211 | 1.58085 |
 |
0.76819 | 1.58276 |
 |
0.70652 | 1.58448 |
 |
0.65627 | 1.58618 |
 |
0.64385 | 1.58665 |
 |
0.6328 | 1.58709 |
 |
0.58929 | 1.58904 |
 |
0.58756 | 1.58913 |
 |
0.54607 | 1.59143 |
 |
0.48613 | 1.59581 |
 |
0.47999 | 1.59636 |
 |
0.44157 | 1.60031 |
 |
0.435835 | 1.60100 |
 |
0.404656 | 1.60528 |
 |
0.365015 | 1.61256 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
489 |
| Annealing Point (°C) |
AP |
520 |
| Transformation Temperature (°C) |
Tg |
527 |
| Yield Point (°C) |
At |
567 |
| Softening Point (°C) |
SP |
619 |
| Expansion Coefficient   |
-30~+70°C |
66 |
+100~+300°C |
81 |
|
Thermal Conductivity |
k |
1.126 |
Mechanical Properties |
||
Young's Modulus |
E |
1008 |
| Rigidity Modulus |
G |
403 |
| Poisson's Ratio |  |
0.252 |
| Knoop Hardness | Hk |
630 [6] |
| Abrasion | Aa |
100 |
Photoelastic Constant |
 |
2.29 |
Partial Dispersions |
|
 |
0.008230 |
 |
0.003418 |
 |
0.002952 |
 |
0.005250 |
 |
0.011867 |
 |
0.005185 |
 |
0.004288 |
 |
0.011567 |
 |
0.008702 |
 |
0.004778 |
 |
0.004928 |
 |
0.016208 |
Deviation of Relative Partial Dispersions |
|
 |
0.0207 |
 |
0.0048 |
 |
-0.0059 |
 |
-0.0043 |
 |
-0.0124 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.16262630 | |
 |
3.25661051 |  |
 |
1.35132486 | |
 |
1.25957437 |  |
 |
-3.26911050 |  |
 |
1.19214596 |  |
1129 ~ 2325 nm |
||
|
1.16262630 | |
|
3.25661051 | |
|
1.35132486 | |
|
1.25957437 | |
|
-3.26911050 | |
|
1.19214596 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
2 |
| Acid Resistance (P) | RA(P) |
4 |
| Weathering Resistance (S) | W(S) |
3 |
| Acid Resistance (S) | SR |
52.2 |
| Phosphate Resistance | PR |
3.2 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
||
| Specific Gravity | d |
2.82 |
|
| Coloring |  |
35 |
|
 |
30 |
||
Relative Partial Dispersions |
|
 |
0.8543 |
 |
0.3548 |
 |
0.3064 |
 |
0.5449 |
 |
1.2318 |
 |
0.5382 |
 |
0.4451 |
 |
1.2006 |
 |
0.8966 |
 |
0.4923 |
 |
0.5077 |
 |
1.6699 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
0.060 |
|
310 |
0.270 |
|
320 |
0.530 |
|
330 |
0.730 |
|
340 |
0.850 |
|
350 |
0.922 |
|
360 |
0.956 |
|
365 |
||
370 |
0.975 |
|
380 |
0.984 |
|
390 |
0.989 |
|
400 |
0.992 |
|
420 |
0.993 |
|
440 |
0.993 |
|
460 |
0.995 |
|
480 |
0.996 |
|
500 |
0.998 |
|
550 |
0.999 |
|
600 |
0.998 |
|
650 |
0.998 |
|
700 |
0.998 |
|
800 |
0.999 |
|
900 |
0.998 |
|
1000 |
0.997 |
|
1200 |
0.997 |
|
1400 |
0.991 |
|
1600 |
0.994 |
|
1800 |
0.989 |
|
2000 |
0.978 |
|
2200 |
0.934 |
|
2400 |
0.810 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 3.9 |
4.3 |
4.3 |
4.4 |
4.5 |
4.8 |
5.1 |
|
| -20 ~ 0 | 3.9 |
4.3 |
4.3 |
4.5 |
4.6 |
4.9 |
5.2 |
|
| 0 ~ 20 | 4.0 |
4.4 |
4.4 |
4.5 |
4.7 |
5.0 |
5.3 |
|
| 20 ~ 40 | 4.0 |
4.4 |
4.5 |
4.6 |
4.7 |
5.1 |
5.4 |
|
| 40 ~ 60 | 4.1 |
4.5 |
4.5 |
4.7 |
4.8 |
5.2 |
5.5 |
|
| 60 ~ 80 | 4.1 |
4.5 |
4.6 |
4.8 |
4.9 |
5.2 |
5.6 |
|