It performs well in optical science, can be compared with optical glass. Its reflection ratio is similar to that of optical glass, hence also recognized as optical plastics. PMMA qualities are in its lightweight, inexpensive, and easily shaped. It can be shaped by molding, ejection formation, machine process, heat-ejection formation. It can also be mass-produced; the process is simple and low-cost. Therefore, its widely used today in commercial billboards, signal boards, skylight window, lamp cover, transportation tools, and doors and windows.