ISO 3597-2:2003规定了测定由粗纱增强树脂制成的圆形截面复合杆弯曲强度的方法。试验可在“成型”棒上进行，或在已在沸水（或其他介质）中浸泡一段时间进行预处理的棒上进行。该试验旨在对粗纱进行检查和质量控制，或评估其在树脂系统中的适用性。获得的结果不用于生成设计数据。

ISO 3597-2:2003 specifies a method for determining the flexural strength of composite rods of circular cross-section made of roving-reinforced resin. The test may be carried out on "as-moulded" rods, or on rods that have been pretreated by immersion in boiling water (or another medium) for a specified time. The test is intended for inspection and quality control of rovings or for evaluating their suitability for use in a resin system. The results obtained are not intended for the generation of design data.