Armstrongs OPTIMA 9/16 in. Square Tegular Acoustic Fiberglass Ceiling Panels also meet Class A fire performance standards per ASTM E84, supporting safety compliance in commercial buildings. The surface is finished with a factory-applied, acoustically transparent DuraBrite membrane, making it washable, impact-resistant, and scratch- and soil-resistant. Each panel is lightweight at approximately 0.55 lbs per sq. ft., with an R-value of 4.00 for added thermal efficiency. Designed for installation in 9/16 in. grid systems, this panel blends acoustic performance, energy savings, and easy maintenance.