Perspex 962 Infrared Transmitting Black Gloss Acrylic Sheets in 3mm and 5mm thickness
Infrared transmitting (IRT) Acrylic is specifically formulated for projects requiring ultraviolet (UV) and visible light to be blocked while allowing infrared (IR) to pass through, starting about 750nm.  What makes this product special is its ability to Transmit Light in the IR region while still blocking UV. 

Perspex 962 can be mounted in front of DVR's, cable boxes, DVD players, etc. and your remote control, wireless router, etc. will still work. The black opaque finish and IRT properties of this acrylic make it ideal for hiding a CCD video camera.