Data/Comparisons
NXT® Technical Data |
| |
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|
| Property |
NXT® |
CR-39™ |
PC |
>1.60
Index |
| Impact resistance (1) |
Pass |
Fail |
Pass |
Some Pass |
| Specific Gravity |
1.11 |
1.32 |
1.22 |
1.30-1.40 |
| Refractive Index |
1.53 |
1.50 |
1.59 |
>1.60 |
| Abbe Number (2) |
45 |
58 |
29 |
32-42 |
| Production Method |
Casting (3) |
Casting (3) |
Injection Molding |
Casting (3) |
| Chemical Resistance |
Good |
Good |
Poor |
Medium |
| Stress Cracking |
Not sensitive |
Brittle |
Sensitive |
Medium |
1. Tested in accord with MIL-PRF-31013, thickness 2.45mm
2. Higher value means better optical quality
3. Low internal stress and high optical quality |
