Today, Aptera held a Zoom webinar with Nathan Armstrong, about Aerodynamics & Composites. He said Aptera Motors was investigating the use of coated polycarbonate for windows.
This would have the advantage of reducing weight.
I have two concerns.
First: What is the cost of a polycarbonate window compared with one made of traditional automotive safety glass?
Second: How easily would a replacement be found. A replacement of auto safety glass would probably be easier found than one of polycarbonate.
If polycarbonate is used, I hope the vehicle can accommodate a window made of glass and replacement windows of glass are available.
I would like an all-polycarbonate window system. Plus, I would add a front window glass-polyfilm overlay (much like you apply a screen protector to a mobile phone) that is adhesively applied, yet replaceable. It only needs to be ~1.2mm thick. That would improve scratch resistance where it matters the most. Of course for this to work, the front windshield shape's curvature would have to be primary only (not compound curvature); OR it could be a multi-segmented (glass & adhesive film) overlay, with a special, glare-reducing clear polymer at the segment unions.