By Brands

Kind of spectacles : Welding helmet
Lens Material : Polycarbonate
Lens color : Welding 13
Lens protection class : 4
Glasses Characteristics : Straight
Glasses Style : Monoblock
Optical class : 1
Frame color : Black
Use : Inside/outside
Weight (g) : 474
Mechanical strength (lens) : F

EN166:2001 Personal eye-protection - Specifications  
EN379:2003 + A1:2009 Specification for welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance.  
EN175:1997 Equipment for eye and face protection during welding and allied processes  
ANSI Z87.1