ISO 8257-2:2001 塑料.聚甲基丙烯酸甲酯（PMMA）模制和挤压材料.第2部分：试样制备性能测定

标准编号：ISO 8257-2:2001

中文名称：塑料.聚甲基丙烯酸甲酯（PMMA）模制和挤压材料.第2部分：试样制备性能测定

英文名称：Plastics — Poly(methyl methacrylate) (PMMA) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties

发布日期：2001-12

标准范围

1.1 ISO 8257的这一部分规定了在规定状态下模塑PMMA材料试样的程序，以及测量其性质的方法。ISO 8257本部分中列出并组合提及的任何特性ISO 8257-1应通过ISO 8257本部分中提及的方法确定。1.2这些属性没有引用任何值。指定用于模塑的PMMA材料所需的那些和挤出在ISO 8257-1中给出。其他性质应通过参考的适当方法确定在ISO 8257的这一部分。1.3根据ISO 8257本部分测定的值不一定与获得的值相同使用不同尺寸和/或通过不同程序制备的样本。他们也可能受到影响通过着色剂和其他添加剂。对于模制物的性质获得的值取决于模制物化合物、试样形状、试验方法和各向异性状态。最后提到的取决于浇注和模制条件，例如温度、压力或注射速率。任何后续治疗还必须考虑例如调节或退火。1.4试样的热历史和内应力可能强烈影响热和机械性能和抗环境应力开裂性，但对电性能影响较小，主要取决于模塑料的化学组成。

1.1 This part of ISO 8257 specifies procedures for moulding test specimens of PMMA materials in a specified state,and methods for measuring their properties. Any property listed in this part of ISO 8257 and referred to in combinationwith ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257.1.2 No values are quoted for these properties. Those required for the designation of PMMA materials for mouldingand extrusion are given in ISO 8257-1. Other properties shall be determined by the appropriate methods referred toin this part of ISO 8257.1.3 The values determined in accordance with this part of ISO 8257 will not necessarily be identical to those obtainedusing specimens of different dimensions and/or prepared by different procedures. They may also be influencedby colorants and other additives. The values obtained for the properties of a moulding depend on the mouldingcompound, the shape of test specimen, the test method and the state of anisotropy. The last-mentioned depends onthe gating and the moulding conditions, for example temperature, pressure or injection rate. Any subsequent treatmentmust also be considered, for example conditioning or annealing.1.4 The thermal history and the internal stresses of the specimens may strongly influence thermal and mechanicalproperties and resistance to environmental stress cracking, but exert less effect on the electrical properties, whichmainly depend on the chemical composition of the moulding compound.

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