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 OHARA
S-FTM16
593353 
597350 
Refractive Index 1.59270 Abbe Number 35.3 Dispersion 0.01679
1.592701 35.31 0.016785
1.596670 35.03 0.017031
Refractive Indices
 
 
2.32542 1.55603
1.97009 1.56154
1.52958 1.56767
1.12864 1.57357
1.01398 1.57569
0.85211 1.57962
0.76819 1.58243
0.70652 1.58508
0.65627 1.58779
0.64385 1.58856
0.6328 1.58929
0.58929 1.59255
0.58756 1.59270
0.54607 1.59667
0.48613 1.60458
0.47999 1.60559
0.44157 1.61318
0.435835 1.61454
0.404656 1.62334
0.365015 1.63974
0.334148  
0.326106  
Thermal Properties
Strain Point
(°C)
StP
 
Annealing Point
(°C)
AP
 
Transformation
Temperature
(°C)
Tg
501
Yield Point
(°C)
At
542
Softening Point
(°C)
SP
 
Expansion
Coefficient
-30~+70°C
90
+100~+300°C
100
Thermal Conductivity
k
0.947
Mechanical Properties
Young's Modulus
E
653
Rigidity Modulus
G
264
Poisson's Ratio
0.238
Knoop Hardness
Hk
490 [5]
Abrasion
Aa
172
Photoelastic Constant
3.33
Partial Dispersions
0.012104
0.005365
0.004906
0.008875
0.021838
0.009959
0.008800
0.025202
0.012872
0.008107
0.008924
0.034147
Deviation of Relative Partial Dispersions
0.0088
0.0010
0.0096
0.0090
0.0721
Constants of Dispersion Formula
326 ~ 1129 nm
1.32940907  
1.41512125
1.44299068  
1.02377287
5.78081956
1.50597139
1129 ~ 2325 nm
1.32940907  
1.41512125
1.44299068  
1.02377287
5.78081956
1.50597139
Chemical Properties
Water Resistance (P)
RW(P)
1
Acid Resistance (P)
RA(P)
1
Weathering Resistance (S)
W(S)
1~2
Acid Resistance (S)
SR
1.0
Phosphate Resistance
PR
2.0
P = Powder Group, S = Surface Group
Other Properties
Bubble Quality Group
B
 
Specific Gravity
d
2.64
Coloring
38
 
35
 
Relative Partial Dispersions
0.7211
0.3196
0.2923
0.5287
1.3010
0.5933
0.5243
1.5015
0.7558
0.4760
0.5240
2.0050
Internal Transmittance
280
 
 
290
 
 
300
 
 
310
 
 
320
 
 
330
 
 
340
 
 
350
0.040
 
360
0.430
 
365
 
 
370
0.810
 
380
0.934
 
390
0.973
 
400
0.984
 
420
0.989
 
440
0.990
 
460
0.991
 
480
0.992
 
500
0.994
 
550
0.997
 
600
0.997
 
650
0.996
 
700
0.996
 
800
0.999
 
900
0.999
 
1000
0.999
 
1200
0.999
 
1400
0.996
 
1600
0.994
 
1800
0.989
 
2000
0.987
 
2200
0.959
 
2400
0.953
 
Temperature Coefficients of Refractive Index
Range of
Temperature (°C)
dn / dt relative
t
C'
He-Ne
D
e
F'
g
i
-40 ~ -20
-1.0
-0.5
-0.4
-0.2
 
0.7
1.4
 
-20 ~ 0
-0.9
-0.4
-0.3
 
0.2
0.8
1.6
 
0 ~ 20
-0.8
-0.2
-0.2
0.1
0.3
1.0
1.8
 
20 ~ 40
-0.7
-0.1
-0.1
0.2
0.5
1.2
2.1
 
40 ~ 60
-0.6
 
 
0.3
0.6
1.4
2.3
 
60 ~ 80
-0.5
0.1
0.1
0.4
0.7
1.6
2.5