These are economical polarizer that offers unmatched glare reduction and greatly increased durability compared to polarizing films. They are laminated to a single piece of acrylic and are intended for applications where an external surface must be exposed to potentially harsh conditions, while the internal surface remains in a protected environment. Applications include rotating polarizers threaded onto the front of lenses and polarizers that are mounted in camera enclosures. PA401 sheet material is routinely laser cut to any desired custom shape, size, and mounting configuration. These polarizers utilize our HT008 polarizing film and are offered in 3.2mm thickness.