Fibre-Metal® 4178CL clear high performance faceshields, as designated, are SEI certified to comply with current ANSI
standards. SEI certification is your assurance of consistent quality and performance.
Fibre-Metal® 4178CL clear faceshield windows are injection molded from propionate, which is superior to
other window materials in every significant performance characteristic. They are pre-formed
at the factory to the exact curve of our crown protectors for easy installation, an exact fit and
a perfect seal against dust, dirt and debris. All High Performance windows are .060" thick
for an extra margin of protection, yet they cost no more than ordinary .040" thick windows.