Effect of macromolecular orientation on stress-cracking of polystyrene

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Abstract
The stress-cracking resistance of thermoplastics can be determined by means of the Oversize Ball Test (DIN 53 449). Figures for critical strain are obtained, which if exceeded cause stress-cracking. They provide a means of assessing the stress-cracking resistance of oriented polystyrenes. It has been found that not only the degree of orientation but also the rate of initiation of the stress-cracking influence the critical strain. The report concludes with further examples of the Oversize Ball Test with polycarbonate, polymethyl methacrylate, and polyethylene.