Light-diffusion filters made of Clarex DR-IIIC from Astra Products Inc., Baldwin, N.Y. (, brighten and enhance images displayed on flat screens of ruggedized military computers. The U.S. Army's Force XXI Battle Command Brigade and Below (FBCB2) computers mount in tracked and wheeled fighting vehicles to give soldiers a comprehensive, graphics-rich view of the battlefield, including situation awareness and command and control.

DR-IIIC Clarex filters are made from polymethyl methacrylate (PMMA) plus additives and have a special matte finish on both sides. Specific filter properties are cast into the material. A color temperature of 6,750°K gives high levels of light transmission and diffusion as well as accurate color transmission in backlit displays. The filters also protect the displays from damage and minimize glare.



Clarex DR-IIIC light filters protect computer flat-screen displays in U.S. military Humvees. Clarex materials (depending on formulation) come in thicknesses from 0.008 to 0.197 in., light transmissions from 45 to 93%, and a variety of colors and finishes. Special coatings and filters are also available including EMI shielding, conductive, scratch resistant, antibacterial, and others.