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Stretched sheets of polymethylmethacrylate (PMMA) from Röhm now satisfy the quality requirements of US standard MIL-P-25690 for the aviation industry. Sheet thicknesses of up to 20 mm (0.787”) have been certified. 

In particular, the certification attests to the chemical resistance of the material, its impact strength (for example against bird strikes), and the fulfillment of optical requirements.

PMMA has been used for decades in areas of the aviation industry where the highest requirements are placed on the material. These include passenger cabin windows, windscreens, and cockpit windows as well as cockpits. The stretched material is superior to cast PMMA in, for example, impact resistance and chemical resistance.

The sheets are produced and stretched in Weiterstadt, in the German state of Hesse. To meet the demand for materials for the aviation industry, the Acrylic Products Business Unit started up in 2018 the advanced production facility for stretching of PMMA.

The plant produces sheets of sizes up to 5.0 m x 3.0 m (200” x 120”), which is double the normal current size. The first customers in the aviation industry have been supplied with samples of the new material since the end of 2018.

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