| Refractive Index (Nd) |
|
1.491
|
1.59
|
1.56
|
1.57
|
1.584
|
1.525
|
| Abbe Value (Vd) |
|
61.4
|
31.1
|
35.0
|
37.8
|
34.5
|
56.0
|
| dn/dt |
X 10^-5/deg C
|
-12.5
|
-12
|
-14
|
-14
|
-14.3
|
-10
|
| Luminous Transmittance |
%Transmittance @ 3mm
|
92
|
88
|
90
|
88
|
90
|
92
|
| Birefringence Potential |
Qualitative
|
Low
|
High
|
High
|
High
|
High
|
Low
|
| Relative Haze |
%
|
2
|
3
|
3
|
3
|
3
|
2
|
| Coefficient of Linear Expansion |
cm/cm X 10^-5/deg C
|
6.0
|
6.0
|
6.8
|
6.8
|
6.9
|
6.0
|
| Deflection of Temperature (3.6 deg F/min @ 66
psi) |
deg C
|
101
|
110
|
100
|
100
|
146
|
147
|
Water Absorption (immersed
24 hr. @ 23 deg C) |
%
|
0.3
|
0.2
|
0.15
|
0.3
|
0.15
|
0.01
|
| Hardness (Scratch Resistance) |
Rockwell M
|
90
|
90
|
80
|
75
|
50
|
75
|
| Izod Impact Resistance |
ASTM D256
|
0.35
|
0.35
|
0.5
|
0.45
|
2.0
|
0.32
|