Methacrylate plastics may be used in applications requiring excellent clarity and transparency, resistance to sunlight and outdoor weathering, and an optimum comnination of flexibility with shatter resistance and rigidity. Examples are edge lighted cockpit and interior control panels. The classes having higher heat distortion temperatures may be used for applications requiring greater heat resistance. A chief disadvantage of these plastics is a lack of abrasion resistance and a tendency to craze.under stress, paraticularly when simultaneously exposed to active solvents or wetting agents. The materials are not for shipboard use.