| OHARA | BSM51Y |
603606 605604 |
||||||
| Refractive Index |  |
1.60311 | Abbe Number |  |
60.6 | Dispersion |  |
0.00995 |
| 1.603109 | 60.65 | 0.009944 | ||||||
 |
1.605481 |  |
60.40 |  |
0.010024 | |||
Refractive Indices |
||
 |
||
 |
2.32542 | 1.57281 |
 |
1.97009 | 1.57865 |
 |
1.52958 | 1.58482 |
 |
1.12864 | 1.59008 |
 |
1.01398 | 1.59177 |
 |
0.85211 | 1.59465 |
 |
0.76819 | 1.59658 |
 |
0.70652 | 1.59834 |
 |
0.65627 | 1.60007 |
 |
0.64385 | 1.60056 |
 |
0.6328 | 1.60101 |
 |
0.58929 | 1.60302 |
 |
0.58756 | 1.60311 |
 |
0.54607 | 1.60548 |
 |
0.48613 | 1.61002 |
 |
0.47999 | 1.61058 |
 |
0.44157 | 1.61468 |
 |
0.435835 | 1.61539 |
 |
0.404656 | 1.61985 |
 |
0.365015 | 1.62743 |
 |
0.334148 | 1.63557 |
 |
0.326106 | 1.63815 |
Thermal Properties |
||
| Strain Point (°C) |
StP |
538 |
| Annealing Point (°C) |
AP |
568 |
| Transformation Temperature (°C) |
Tg |
585 |
| Yield Point (°C) |
At |
617 |
| Softening Point (°C) |
SP |
684 |
| Expansion Coefficient   |
-30~+70°C |
63 |
+100~+300°C |
77 |
|
Thermal Conductivity |
k |
0.961 |
Mechanical Properties |
||
Young's Modulus |
E |
901 |
| Rigidity Modulus |
G |
359 |
| Poisson's Ratio |  |
0.256 |
| Knoop Hardness | Hk |
570 [6] |
| Abrasion | Aa |
117 |
Photoelastic Constant |
 |
|
Partial Dispersions |
|
 |
0.008303 |
 |
0.003489 |
 |
0.003035 |
 |
0.005407 |
 |
0.012286 |
 |
0.005377 |
 |
0.004454 |
 |
0.012031 |
 |
0.008787 |
 |
0.004923 |
 |
0.005101 |
 |
0.168440 |
Deviation of Relative Partial Dispersions |
|
 |
0.0037 |
 |
0.0015 |
 |
-0.0033 |
 |
-0.0026 |
 |
-0.0073 |
Constants of Dispersion Formula |
||
326 ~ 1129 nm |
||
 |
1.22393171 | |
 |
3.06482383 |  |
 |
8.23950901 | |
 |
6.49521083 |  |
 |
2.08194161 |  |
 |
7.95168951 |  |
1129 ~ 2325 nm |
||
|
1.12268320 | |
|
4.07804849 | |
|
1.16161178 | |
|
5.79521544 | |
|
1.91303182 | |
|
1.11113962 |  |
Chemical Properties |
||
| Water Resistance (P) | RW(P) |
2 |
| Acid Resistance (P) | RA(P) |
4 |
| Weathering Resistance (S) | W(S) |
3 |
| Acid Resistance (S) | SR |
51.2 |
| Phosphate Resistance | PR |
2.2 |
| P = Powder Group, S = Surface Group | ||
Other Properties |
|||
| Bubble Quality Group | B |
1 |
|
| Specific Gravity | d |
3.36 |
|
| Coloring |  |
32 |
|
 |
29 |
||
Relative Partial Dispersions |
|
 |
0.8350 |
 |
0.3509 |
 |
0.3052 |
 |
0.5437 |
 |
1.2355 |
 |
0.5407 |
 |
0.4479 |
 |
1.2099 |
 |
0.8766 |
 |
0.4911 |
 |
0.5089 |
 |
1.6804 |
Internal Transmittance |
||
 |
 |
 |
280 |
||
290 |
0.030 |
|
300 |
0.330 |
0.060 |
310 |
0.690 |
0.400 |
320 |
0.880 |
0.720 |
330 |
0.950 |
0.870 |
340 |
0.977 |
0.944 |
350 |
0.988 |
0.970 |
360 |
0.993 |
0.983 |
365 |
0.995 |
0.987 |
370 |
0.996 |
0.990 |
380 |
0.997 |
0.993 |
390 |
0.998 |
0.995 |
400 |
0.998 |
0.996 |
420 |
0.998 |
0.996 |
440 |
0.998 |
0.996 |
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 |
0.992 |
0.980 |
1800 |
0.983 |
0.959 |
2000 |
0.967 |
0.920 |
2200 |
0.890 |
0.740 |
2400 |
0.780 |
0.540 |
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 |
2.8 |
2.8 |
2.9 |
3.1 |
3.3 |
3.6 |
4.3 |
| -20 ~ 0 | 2.6 |
2.9 |
2.9 |
3.0 |
3.1 |
3.4 |
3.7 |
4.4 |
| 0 ~ 20 | 2.6 |
2.9 |
2.9 |
3.1 |
3.2 |
3.5 |
3.8 |
4.6 |
| 20 ~ 40 | 2.6 |
3.0 |
3.0 |
3.1 |
3.3 |
3.6 |
3.9 |
4.7 |
| 40 ~ 60 | 2.7 |
3.0 |
3.0 |
3.2 |
3.3 |
3.6 |
4.0 |
4.8 |
| 60 ~ 80 | 2.7 |
3.1 |
3.1 |
3.3 |
3.4 |
3.7 |
4.1 |
4.9 |