I’m currently working a project to produce a roadside speed camera which displays vehicle speed to drivers to improve speed awareness. A Doppler radar gun operating at 24.1GHz (1.24cm) is being used as the source and detector. There is a weather tight plastic box (opaque, at least to visible light) to put this in, also have some transparent 10mm acrylic. The idea is to cut a hole in the box and use the acrylic as a window. The problem is I have no idea if the acrylic is transparent to the radar frequency being used and I haven’t been able to find any information online. If you have any knowledge in this area please let me know!