ISO 527-4 is an international testing standard for determining the tensile properties of fiber-reinforced plastic composites. ISO 527-4 covers test conditions for isotropic and orthotropic non-unidirectional composites and refers to ISO 527-1. This guide is designed to introduce you to the basic elements of an ISO 527-4 tensile test, including an overview of the equipment, software, and samples needed. However, anyone planning to conduct testing to ISO 527-4 should not consider this guide an adequate substitute for reading the full standard.