There are two main types of safety lenses commonly used in the market:

One is CR39 resin lenses, with mechanical strength Grade S; they offer enhanced durability but typically cannot protect against high-speed particle impacts**

The other is PC (Polycarbonate) lenses, with mechanical strength Grade F. They can protect against high-speed particle impacts.

All lenses used in Honeywell safety glasses are PC Polycarbonate lenses.

[** Protection against high-speed particle impacts (162 km/h) under room temperature usage conditions]