| OHARA | S-BAL2 |
571508 574505 |
||||||
| Refractive Index |  |
1.57099 | Abbe Number |  |
50.8 | Dispersion |  |
0.01124 |
| 1.570989 | 50.80 | 0.011240 | ||||||
 |
1.573663 |  |
50.50 |  |
0.011359 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.54240 |
 |
1.97009 | 1.54721 |
 |
1.52958 | 1.55244 |
 |
1.12864 | 1.55722 |
 |
1.01398 | 1.55886 |
 |
0.85211 | 1.56179 |
 |
0.76819 | 1.56383 |
 |
0.70652 | 1.56572 |
 |
0.65627 | 1.56762 |
 |
0.64385 | 1.56815 |
 |
0.6328 | 1.56865 |
 |
0.58929 | 1.57089 |
 |
0.58756 | 1.57099 |
 |
0.54607 | 1.57366 |
 |
0.48613 | 1.57886 |
 |
0.47999 | 1.57951 |
 |
0.44157 | 1.58430 |
 |
0.435835 | 1.58514 |
 |
0.404656 | 1.59045 |
 |
0.365015 | 1.59972 |
 |
0.334148 | |
 |
0.326106 | |
Thermal Properties |
||
| Strain Point (°C) |
StP |
492 |
| Annealing Point (°C) |
AP |
525 |
| Transformation Temperature (°C) |
Tg |
540 |
| Yield Point (°C) |
At |
582 |
| Softening Point (°C) |
SP |
663 |
| Expansion Coefficient   |
-30~+70°C |
91 |
+100~+300°C |
109 |
|
Thermal Conductivity |
k |
0.901 |
Mechanical Properties |
||
Young's Modulus |
E |
727 |
| Rigidity Modulus |
G |
292 |
| Poisson's Ratio |  |
0.245 |
| Knoop Hardness | Hk |
510 [5] |
| Abrasion | Aa |
163 |
Photoelastic Constant |
 |
2.32 |
Partial Dispersions |
|
 |
0.008753 |
 |
0.003787 |
 |
0.003373 |
 |
0.006047 |
 |
0.014148 |
 |
0.006281 |
 |
0.005308 |
 |
0.014580 |
 |
0.009286 |
 |
0.005514 |
 |
0.005845 |
 |
0.020209 |
Deviation of Relative Partial Dispersions |
|
 |
-0.0063 |
 |
-0.0005 |
 |
-0.0005 |
 |
-0.0005 |
 |
-0.0024 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.30923813 | |
 |
1.14137353 |  |
 |
1.17882259 | |
 |
8.38873953 |  |
 |
3.99436485 |  |
 |
1.40257892 |  |
1129 ~ 2325 nm |
||
|
1.30923813 | |
|
1.14137353 | |
|
1.17882259 | |
|
8.38873953 | |
|
3.99436485 | |
|
1.40257892 | |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
3 |
| Acid Resistance (S) | SR |
1.0 |
| Phosphate Resistance | PR |
1.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
2.89 |
|
| Coloring |  |
37 |
|
 |
34 |
||
Relative Partial Dispersions |
|
 |
0.7787 |
 |
0.3369 |
 |
0.3001 |
 |
0.5380 |
 |
1.2587 |
 |
0.5588 |
 |
0.4722 |
 |
1.2972 |
 |
0.8175 |
 |
0.4854 |
 |
0.5146 |
 |
1.7791 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
||
330 |
||
340 |
0.100 |
|
350 |
0.470 |
|
360 |
0.760 |
|
365 |
||
370 |
0.890 |
|
380 |
0.947 |
|
390 |
0.971 |
|
400 |
0.983 |
|
420 |
0.992 |
|
440 |
0.993 |
|
460 |
0.995 |
|
480 |
0.996 |
|
500 |
0.997 |
|
550 |
0.998 |
|
600 |
0.998 |
|
650 |
0.998 |
|
700 |
0.998 |
|
800 |
0.998 |
|
900 |
0.998 |
|
1000 |
0.997 |
|
1200 |
0.997 |
|
1400 |
0.992 |
|
1600 |
0.992 |
|
1800 |
0.976 |
|
2000 |
0.951 |
|
2200 |
0.890 |
|
2400 |
0.840 |
|
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | -0.7 |
-0.3 |
-0.3 |
-0.2 |
0.4 |
0.7 |
||
| -20 ~ 0 | -0.7 |
-0.3 |
-0.3 |
-0.1 |
0.4 |
0.8 |
||
| 0 ~ 20 | -0.6 |
-0.2 |
-0.2 |
-0.1 |
0.1 |
0.5 |
0.9 |
|
| 20 ~ 40 | -0.6 |
-0.2 |
-0.2 |
0.2 |
0.6 |
1.1 |
||
| 40 ~ 60 | -0.6 |
-0.1 |
-0.1 |
0.1 |
0.2 |
0.7 |
1.2 |
|
| 60 ~ 80 | -0.5 |
-0.1 |
-0.1 |
0.1 |
0.3 |
0.8 |
1.3 |
|