| OHARA | PBM18Y |
596387 599385 |
||||||
| Refractive Index |  |
1.59551 | Abbe Number |  |
38.7 | Dispersion |  |
0.01537 |
| 1.595509 | 38.77 | 0.015361 | ||||||
 |
1.599153 |  |
38.50 |  |
0.015561 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.56207 |
 |
1.97009 | 1.56696 |
 |
1.52958 | 1.57243 |
 |
1.12864 | 1.57779 |
 |
1.01398 | 1.57975 |
 |
0.85211 | 1.58338 |
 |
0.76819 | 1.58599 |
 |
0.70652 | 1.58846 |
 |
0.65627 | 1.59097 |
 |
0.64385 | 1.59169 |
 |
0.6328 | 1.59236 |
 |
0.58929 | 1.59537 |
 |
0.58756 | 1.59551 |
 |
0.54607 | 1.59915 |
 |
0.48613 | 1.60634 |
 |
0.47999 | 1.60725 |
 |
0.44157 | 1.61400 |
 |
0.435835 | 1.61520 |
 |
0.404656 | 1.62284 |
 |
0.365015 | 1.63656 |
 |
0.334148 | 1.65255 |
 |
0.326106 | 1.65795 |
Thermal Properties |
||
| Strain Point (°C) |
StP |
377 |
| Annealing Point (°C) |
AP |
419 |
| Transformation Temperature (°C) |
Tg |
441 |
| Yield Point (°C) |
At |
478 |
| Softening Point (°C) |
SP |
565 |
| Expansion Coefficient   |
-30~+70°C |
88 |
+100~+300°C |
100 |
|
Thermal Conductivity |
k |
0.865 |
Mechanical Properties |
||
Young's Modulus |
E |
598 |
| Rigidity Modulus |
G |
244 |
| Poisson's Ratio |  |
0.223 |
| Knoop Hardness | Hk |
410 [4] |
| Abrasion | Aa |
132 |
Photoelastic Constant |
 |
2.79 |
Partial Dispersions |
|
 |
0.011228 |
 |
0.004982 |
 |
0.004534 |
 |
0.008178 |
 |
0.019689 |
 |
0.008862 |
 |
0.007643 |
 |
0.021360 |
 |
0.011940 |
 |
0.007466 |
 |
0.008095 |
 |
0.029310 |
Deviation of Relative Partial Dispersions |
|
 |
0.0023 |
 |
0.0015 |
 |
-0.0024 |
 |
-0.0018 |
 |
-0.0099 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.34660215 | |
 |
1.36322343 |  |
 |
1.83371587 | |
 |
1.06313733 |  |
 |
4.91403013 | |
 |
2.39154655 |  |
1129 ~ 2325 nm |
||
|
1.32558993 | |
|
1.57859674 | |
|
1.03396744 | |
|
1.01008566 | |
|
4.74276657 | |
|
1.23686168 |  |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
1 |
| Acid Resistance (P) | RA(P) |
1 |
| Weathering Resistance (S) | W(S) |
2~3 |
| Acid Resistance (S) | SR |
1.0 |
| Phosphate Resistance | PR |
2.0 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
3.37 |
|
| Coloring |  |
34 |
|
 |
31 |
||
Relative Partial Dispersions |
|
 |
0.7309 |
 |
0.3243 |
 |
0.2952 |
 |
0.5324 |
 |
1.2818 |
 |
0.5769 |
 |
0.4976 |
 |
1.3905 |
 |
0.7673 |
 |
0.4798 |
 |
0.5202 |
 |
1.8836 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
||
300 |
||
310 |
||
320 |
0.220 |
0.020 |
330 |
0.680 |
0.390 |
340 |
0.912 |
0.790 |
350 |
0.975 |
0.939 |
360 |
0.990 |
0.976 |
365 |
0.993 |
0.983 |
370 |
0.995 |
0.988 |
380 |
0.997 |
0.992 |
390 |
0.998 |
0.994 |
400 |
0.998 |
0.995 |
420 |
0.998 |
0.996 |
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 |
0.998 |
1000 |
0.998 |
0.996 |
1200 |
0.998 |
0.996 |
1400 |
0.996 |
0.990 |
1600 |
0.994 |
0.986 |
1800 |
0.979 |
0.948 |
2000 |
0.956 |
0.890 |
2200 |
0.907 |
0.780 |
2400 |
0.870 |
0.710 |
Temperature Coefficients of Refractive Index |
||||||||
Range of Temperature (°C) |
dn / dt relative  |
|||||||
t |
C' |
He-Ne |
D |
e |
F' |
g |
i |
|
| -40 ~ -20 | 2.5 |
3.1 |
3.2 |
3.4 |
3.7 |
4.4 |
5.2 |
7.6 |
| -20 ~ 0 | 2.5 |
3.3 |
3.3 |
3.5 |
3.9 |
4.6 |
5.4 |
7.9 |
| 0 ~ 20 | 2.6 |
3.4 |
3.4 |
3.7 |
4.0 |
4.7 |
5.5 |
8.1 |
| 20 ~ 40 | 2.7 |
3.5 |
3.5 |
3.8 |
4.1 |
4.9 |
5.7 |
8.4 |
| 40 ~ 60 | 2.8 |
3.6 |
3.6 |
3.9 |
4.2 |
5.0 |
5.9 |
8.7 |
| 60 ~ 80 | 2.8 |
3.7 |
3.7 |
4.0 |
4.3 |
5.2 |
6.1 |
8.9 |