Welding filters are manufactured from thehighest quality glass or polycarbonate tocomply with the requirements of theAustralian/New Zealand and other nationalstandards (eg. ANSI Z87.1 & EN 169).All CIGWELD Glass Filter lenses are fullystandards approved. If non-approved lensesare used with CIGWELD standards approvedhelmets it will void the standard markapproval and liability.