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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 +++ + + +++