This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist. This specification covers one type of methyl methacrylate in the form of extrusions, compression moldings, and injection moldings. These products have been used typically for parts requiring good dimensional stability, a high degree of optical clarity, and good resistance to outdoor weathering, but usage is not limited to such applications.