Elevated- and Room-Temperature Properties of Transparent Acrylic Sheet Materials
BATTELLE MEMORIAL INST COLUMBUS OH
Pagination or Media Count:
Two regular grades of transparent acrylic sheet, Plexiglas Ia and Lucite HC-201, and two heat-resistant grades, Lucite HC-202 and Plexiglas II, were tested in tensile creep and creep rupture, crazing, short-time tensile, and deterioration at room temperature, 160 and 200 F. The creep and creep-rupture tests indicated that the heat-resistant variety was considerably stronger than the regular grade, even at room temperature. At 160 and 200 F the superiority of the heat-resistant grade was much greater. At 200 F the regular acrylate sheet did not have any practicl load-carrying ability. The heat-resistant material was also much superior to the regular acrylate sheet in resistance to crazing at elevated temperatures. A linear relationship exists between temperature and stress for incipient crazing in the heat-resistant acrylate over the temperature range of this investigation. The stress to produce crazing decreased about 15 psi for each degree increased in temperature.