This Polyvinyl Alcohol-Iodine filter has no color distortion (neutral) and very good polarization efficiency (99.9%). The losses are low (38% transmission for unpolarized incident light).
It comes in a width of 17" (43cm) and you can order any length in multiples of 1 foot (30.5cm) (full roll is 800 ft long = 244 meters). The transmission axis is parallel to the width. It is 0.006 inch (0.15 mm) thick.
Easy to cut with scissors to any shape.
Transmittance single: 38% +/- 1% @ 550 nm
Transmittance crossed: < 0.005 @ 430 - 670 nm
Polarizing efficiency: > 99.9 %