ISO 294-5:2017规定了用于板材注射成型的模具（指定为F型ISO模具），首选尺寸为80mm×120mm，最小尺寸为80mm×120mm≥90 mm，单点和多点数据采集的首选厚度为2 mm。人们发现，它具有最大的各向异性特性，对注入速率只有轻微的敏感性。尽可能使用双腔模具。对于塑料零件的设计，这将提供拉伸性能的上限和下限。由于模具填充率和零件几何形状对各向异性的影响，将板材厚度与给定零件厚度匹配不是合适的标准。 材料各向异性调查是一种特殊程序，旨在为最终用途的模塑件设计提供指导，而不是作为质量控制工具。 在热塑性材料的注射成型中，熔融聚合物的流动会影响填料（如玻璃纤维）的取向或聚合物链的取向，从而导致各向异性行为。 在ISO 294-5:2017中，流动方向定义为从浇口到模腔远端的方向，交叉方向定义为与流动方向垂直的方向。 F型模具不打算取代用于测定热塑性塑料成型收缩率的D型模具。

ISO 294-5:2017 specifies a mould (designated the type F ISO mould) for the injection moulding of plates with a preferred size of 80 mm × 120 mm and a minimum size of 80 mm × ≥90 mm and with a preferred thickness of 2 mm for single-point and multi-point data acquisition. It has been found to provide the maximum anisotropic properties, with only a slight sensitivity to the rate of injection. Whenever possible, a two cavity mould is intended to be used. For the design of plastic parts, this will provide upper and lower bounds for the tensile properties. Matching the plate thickness to a given part thickness is not a suitable criterion because of the effect of mould filling rate and part geometry on anisotropy. Investigation of the anisotropy of materials is a special procedure intended to provide guidance in the design of mouldings for end-use applications and is not intended as a quality control tool. In the injection moulding of thermoplastic materials, the flow of molten polymer can influence the orientation of fillers such as fibreglass or the orientation of polymer chains, resulting in anisotropic behaviour. For the purposes of ISO 294-5:2017, the flow direction is defined as the direction from the gate to the far end of the mould cavity and the cross direction as the direction perpendicular to the flow direction. The type F mould is not intended to replace the type D mould used to determine the moulding shrinkage of thermoplastics.