Comparison of lens materials
| Lens Material | Specification | Approval / Marking |
Application / Protective value |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Specific weight g/cm³ |
Index material | Abbe-Index | Manufacturer identification | Optical grade | Mechanical strength |
Chemical resistance |
Resistance against sparks |
Mechanical impact resistance |
Scratch resistance | ||
| Plastic | |||||||||||
| CR 39 modified | 1,3 | 1,5 | 58 | W | 1 | S | ++ | ++ | + | + | Hard coating optional |
| High Index 1.60 | 1,33 | 1,6 | 42 | W | 1 | S | ++ | ++ | + | ++ | Hard coating included |
| High Index 1.67 | 1,4 | 1,67 | 32 | W | 1 | S | ++ | ++ | + | ++ | Hard coating included |
| Polycarbonate | 1,2 | 1,59 | 30 | W | 1 | F | + | ++ | +++ | ++ | Hard coating included |
| Trivex | 1,1 | 1,53 | 46 | W | 1 | F | +++ | ++ | +++ | ++ | Hard coating included |
| Silicate | |||||||||||
| Hard glass modified, hardened | 2,5 Optical crown glass – hardened glass is heavier. |
1,52 | 59 | W | 1 | S | +++ | + | + | +++ | |