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 OHARA
S-FPL53
439950 
440946 
Refractive Index 1.43875 Abbe Number 95.0 Dispersion 0.00462
1.438750 94.93 0.004622
1.439854 94.49 0.004655
Refractive Indices
 
 
2.32542 1.42512
1.97009 1.42762
1.52958 1.43032
1.12864 1.43269
1.01398 1.43346
0.85211 1.43480
0.76819 1.43570
0.70652 1.43652
0.65627 1.43733
0.64385 1.43756
0.6328 1.43777
0.58929 1.43871
0.58756 1.43875
0.54607 1.43985
0.48613 1.44195
0.47999 1.44221
0.44157 1.44410
0.435835 1.44442
0.404656 1.44645
0.365015 1.44986
0.334148  
0.326106  
Thermal Properties
Strain Point
(°C)
StP
 
Annealing Point
(°C)
AP
 
Transformation
Temperature
(°C)
Tg
426
Yield Point
(°C)
At
456
Softening Point
(°C)
SP
 
Expansion
Coefficient
-30~+70°C
145
+100~+300°C
169
Thermal Conductivity
k
0.857
Mechanical Properties
Young's Modulus
E
691
Rigidity Modulus
G
265
Poisson's Ratio
0.303
Knoop Hardness
Hk
320 [3]
Abrasion
Aa
451
Photoelastic Constant
0.57
Partial Dispersions
0.003870
0.001631
0.001417
0.002521
0.005673
0.002468
0.002028
0.005437
0.004097
0.002294
0.002361
0.007645
Deviation of Relative Partial Dispersions
-0.1548
-0.0381
0.0598
0.0461
0.2462
Constants of Dispersion Formula
326 ~ 1129 nm
9.83532327
6.95688140
1.11409238  
4.92234955
1.93581091
2.64275294
1129 ~ 2325 nm
9.83532327
6.95688140
1.11409238  
4.92234955
1.93581091
2.64275294
Chemical Properties
Water Resistance (P)
RW(P)
1
Acid Resistance (P)
RA(P)
3
Weathering Resistance (S)
W(S)
3
Acid Resistance (S)
SR
52.3
Phosphate Resistance
PR
4.3
P = Powder Group, S = Surface Group
Other Properties
Bubble Quality Group
B
B
Specific Gravity
d
3.62
Coloring
33
 
28
 
Relative Partial Dispersions
0.8373
0.3529
0.3066
0.5454
1.2274
0.5340
0.4388
1.1763
0.8801
0.4928
0.5072
1.6423
Internal Transmittance
280
0.040
 
290
0.120
 
300
0.280
 
310
0.510
 
320
0.710
 
330
0.850
 
340
0.928
 
350
0.967
 
360
0.985
 
365
 
 
370
0.992
 
380
0.996
 
390
0.997
 
400
0.996
 
420
0.995
 
440
0.995
 
460
0.996
 
480
0.997
 
500
0.998
 
550
0.999
 
600
0.998
 
650
0.997
 
700
0.998
 
800
0.998
 
900
0.997
 
1000
0.997
 
1200
0.998
 
1400
0.998
 
1600
0.998
 
1800
0.998
 
2000
0.998
 
2200
0.997
 
2400
0.998
 
Temperature Coefficients of Refractive Index
Range of
Temperature (°C)
dn / dt relative
t
C'
He-Ne
D
e
F'
g
i
-40 ~ -20
-5.9
-5.8
-5.8
-5.7
-5.7
-5.6
-5.5
 
-20 ~ 0
-6.2
-6.1
-6.1
-6.1
-6.0
-5.9
-5.8
 
0 ~ 20
-6.5
-6.4
-6.4
-6.4
-6.3
-6.2
-6.1
 
20 ~ 40
-6.9
-6.8
-6.7
-6.7
-6.6
-6.5
-6.4
 
40 ~ 60
-7.2
-7.1
-7.1
-7.0
-7.0
-6.8
-6.7
 
60 ~ 80
-7.5
-7.4
-7.4
-7.3
-7.3
-7.2
-7.0