Development of an ISO Standard for Determining Anisotropic Properties of Glass-Filled Thermoplastics

摘要

During injection molding of glass-filled thermoplastics, the flow of the molten polymer causes preferential orientation of the fibers, which leads to the development of anisotropic mechanical properties across a part. These anisotropic properties pose a significant challenge to part designers, who normally assume isotropic properties measured on tensile bar samples. This paper describes the background information and test data used to prepare an ISO standard plaque (ISO 294-5: 2001) for measuring anisotropic properties and developing a relevant materials property database for plastic part design.