1.1 这些试验方法适用于测定任何实心或空心制造的方形、矩形、圆形或其他具有粘弹性行为的几何截面的塑料木材产品的弯曲性能。试样是完整的“制造”件，没有对切割长度以外的表面进行任何更改或机加工。因此，这是一种评估塑料木材产品性能的测试方法，而不是一种材料性能测试方法。不能确定那些在极端外部纤维中不断裂或不失效的产品的抗弯强度。 注1: 该测试方法是为应用于塑料木材而开发的，但它足够通用，同样适用于其他塑料复合材料，包括木塑复合材料。 1.2 试验方法A， 主要设计用于平板或平板位置的产品。 1.3 试验方法B， 主要为边缘或“托梁”位置的产品设计。 1.4 塑料木材目前使用几种不同的塑料制造工艺生产。这些工艺利用了多种不同的塑料树脂材料体系，包括填料、纤维增强剂和其他化学添加剂。本试验方法适用于塑料树脂为连续相的塑料木材产品，无论其制造工艺、所用塑料树脂的类型或重量百分比、所用填料的类型或质量百分比、所使用增强材料的类型或数量百分比以及其他化学添加剂的类型或体积百分比如何。 1.4.1 在塑料木材产品的制造中，允许使用原始和回收热塑性材料系统的多种组合来替代单一树脂材料系统。 1.4.2 在塑料木材产品的制造中，允许使用各种类型和组合的无机和有机填料系统。无机填料包括滑石、云母、二氧化硅、硅灰石、碳酸钙等材料。有机填料包括由木材、木粉、亚麻、稻壳、小麦秸秆及其组合制成或衍生的木质纤维素材料。 1.4.3 塑料木材中使用的纤维增强材料包括人造材料，如玻璃纤维（短切或连续）、碳、芳纶和其他聚合物；或基于木质纤维素的纤维，如亚麻、黄麻、红麻和大麻。 1.4.4 各种各样的化学添加剂被添加到塑料木材配方中，以达到许多不同的目的。实例包括着色剂、化学发泡剂、紫外线稳定剂、阻燃剂、润滑剂、防静电产品、杀生物剂、热稳定剂和偶联剂 1.5 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 注2: 目前还没有与该标准等效的ISO。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 通过这些测试方法确定的弯曲特性对于研究和开发、质量控制、规范下的验收或拒收以及特殊目的特别有用。 5.2 试验方法A和B中规定的试样深度、温度、大气条件和应变率差异能够影响弯曲性能结果。

1.1 These test methods are suitable for determining the flexural properties for any solid or hollow manufactured plastic lumber product of square, rectangular, round, or other geometric cross section that shows viscoelastic behavior. The test specimens are whole “as manufactured” pieces without any altering or machining of surfaces beyond cutting to length. As such, this is a test method for evaluating the properties of plastic lumber as a product and not a material property test method. Flexural strength cannot be determined for those products that do not break or that do not fail in the extreme outer fiber. Note 1: This test method was developed for application to plastic lumber materials, but it is generic enough that it would be equally applicable to other plastic composite materials, including wood-plastic composite materials. 1.2 Test Method A, designed principally for products in the flat or “plank” position. 1.3 Test Method B, designed principally for those products in the edgewise or “joist” position. 1.4 Plastic lumber currently is produced using several different plastic manufacturing processes. These processes utilize a number of diverse plastic resin material systems that include fillers, fiber reinforcements, and other chemical additives. The test methods are applicable to plastic lumber products where the plastic resin is the continuous phase, regardless of its manufacturing process, type or weight percentage of plastic resin utilized, type or weight percentage of fillers utilized, type or weight percentage of reinforcements utilized, and type or weight percentage of other chemical additives. 1.4.1 Alternative to a single resin material system, diverse and multiple combinations of both virgin and recycled thermoplastic material systems are permitted in the manufacture of plastic lumber products. 1.4.2 Diverse types and combinations of inorganic and organic filler systems are permitted in the manufacturing of plastic lumber products. Inorganic fillers include such materials as talc, mica, silica, wollastonite, calcium carbonate, and so forth. Organic fillers include lignocellulosic materials made or derived from wood, wood flour, flax shive, rice hulls, wheat straw, and combinations thereof. 1.4.3 Fiber reinforcements used in plastic lumber include manufactured materials such as fiberglass (chopped or continuous), carbon, aramid and other polymerics; or lignocellulosic-based fibers such as flax, jute, kenaf, and hemp. 1.4.4 A wide variety of chemical additives are added to plastic lumber formulations to serve numerous different purposes. Examples include colorants, chemical foaming agents, ultraviolet stabilizers, flame retardants, lubricants, anti-static products, biocides, heat stabilizers, and coupling agents 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 2: There is no known ISO equivalent to this standard. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Flexural properties determined by these test methods are especially useful for research and development, quality control, acceptance or rejection under specifications, and special purposes. 5.2 Specimen depth, temperature, atmospheric conditions, and the difference in rate of straining specified in Test Methods A and B are capable of influencing flexural property results.