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1 National Bureau of Standards, Washington, D. C.
Investigations of the crazing of acrylic dentures and plastic teeth demonstrated that when linear methyl methacrylate polymer comes in contact with water during processing at elevated temperatures, the material is susceptible to crazing. Material protected from water during the processing does not craze.
An explanation for the crazing process, based on the experimental evidence, is advanced. Sorption of excess water at elevated temperature causes the surface of the material to be supersaturated with water when the specimen is cooled. Evaporation of excess water sets up strains which eventually are released by the formation of craze marks.
Submitted on January 21, 1954
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