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Optical Products > Intercast Industrial > Performance Characteristics
Performance Characteristics
Property Comparison Chart for Industrial Sheet Materials
| Optical |
Test Conditions |
Units |
Standards |
CR-39 |
PMMA |
PC |
| Luminous Transmittance |
|
% |
|
92 |
93 |
90 |
| Haze |
|
% |
|
0.2 |
0.1 |
0.3 |
| Yellowness Index |
|
|
ASTM E313 |
0.2 |
0.2 |
0.4 |
| Refractive Index, ηe |
23ºC, 546 nm |
|
|
1.50 |
1.49 |
1.59 |
| Abbe Number, ve |
23ºC, 546 nm |
|
|
57 |
59 |
29 |
| Retardation - 560 nm |
XY Direction |
nm |
|
2 |
2 |
700 |
|
Z Direction |
nm |
|
36
| 13 |
570 |
| Mechanical |
Test Conditions |
Units |
Standards |
CR-39 |
PMMA |
PC |
| Martens Hardness (HM) |
|
N/mm2 |
ISO 14577 |
103 |
161 |
94 |
| Impact Resistance |
3.3 m / s |
|
ASTM D3763-08 |
|
|
|
| Deflection at Peak Load |
|
mm |
|
5.0 |
3.2 |
16.3 |
| Peak Load |
|
N |
|
633 |
79 |
2,330 |
| Total Energy |
|
J |
|
1.3 |
0.2 |
21.3 |
| Taber Abrasion |
500 g, 100 Cycles |
% |
|
12% |
36% |
45% |
| Steel Wool Abrasion |
200 Cycles |
% |
|
2% |
12% |
18% |
| Thermal |
Test Conditions |
Units |
Standards |
CR-39 |
PMMA |
PC |
| Specific Heat |
25ºC |
J / g / ºC |
ASTM E1269 |
1.30 |
1.26 |
1.05 |
| Thermal Expansion Coefficient |
|
µm / (m ºC) |
ASTM E831 |
100 |
80 |
70 |
| Softening Temperature |
|
ºC |
ASTM E1545 |
> 200 |
161 |
141 |
| UL 94 Flammability Class |
50% RH / 23ºC |
|
ASTM D635-06 |
HB |
HB |
V-2 |
| Electrical |
Test Conditions |
Units |
Standards |
CR-39 |
PMMA |
PC |
| Surface Resistivity |
50% RH / 23ºC, 500V |
Ohms |
ASTM 257-99 |
28 x 1015 |
72 x 1012 |
12 x 1015 |
| Volume Resistivity |
50% RH / 23ºC, 500V |
Ohms-cm |
ASTM 257-99 |
15 - 1015 |
14 x 1015 |
400 x 1015 |
| Basic |
Test Conditions |
Units |
Standards |
CR-39 |
PMMA |
PC |
| Specific Gravity |
|
g / cm3 |
|
1.31 |
1.16 |
1.20 |
| Water Absorption |
|
% |
|
0.7 |
0.8 |
0.3 |
| Water Vapor Transmission Rate |
100% RH / 38ºC |
g / (100 in2 *day) |
ASTM F-1249 |
0.27 |
0.15 |
0.29 |
| Oxygen Permeability |
0% RH / 23ºC |
cm3 / (100 in2 * day) |
ASTM D3801 |
0.1 |
0.2 |
6.0 |
All materials were tested at 1.0 mm thickness |
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