Does anyone has STC rating for different thickness of clear acrylic
sheets? I believe they are also called Plexiglass?

I am thinking of installing a 4' x 8' sheet on my warehouse ceiling
skylight opening to cut down some noise from the outside, and at the
same time preserve the exterior light coming in through the skylight.

The other option is to use vinyl noise barriers. Has anyone installed
them on exposed ceilings without covering them up with drywall?

Thanks