本文件规定了热塑性聚甲醛（POM）模塑和挤出材料的命名系统，该系统可作为分类基础。
注：聚甲醛材料是热塑性材料，主要由甲醛合成的均聚物和共聚物长链组成。分子链中的重复单元是-CH2O-作为甲醛聚合产生的主聚合物链的组成部分。
不同类型的聚甲醛材料用指定的特征性能值（熔体质量流动速率或熔体体积流动速率，拉伸弹性模量），以及基本聚合物参数、推荐用途、加工方法、重要性能、添加剂、着色剂、填料和增强材料等为基础的一种分类系统加以区分。
本文件适用于聚甲醛均聚物、共聚物和含有聚甲醛共混物的所有材料。适用于通用的粉状、粒状或片状材料，也适用于未改性和经着色剂、添加剂、填料等改性的材料。本文件不意味着命名相同的材料必定具有相同的性能。
本文件不提供最终应用特定材料的工程数据、性能数据和加工条件的数据。需要时，可按相关国际标准中规定的试验方法确定这些附加性能。

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本文件规定了聚甲醛模塑与挤出材料试样制备和性能测定的方法。
本文件规定了被测试材料的处理方法，以及模塑前的被测试材料和测试前的试样的状态调节要求。本文件规定了试样制备的方法和条件，以及测量试样的方法。
本文件适用于聚甲醛模塑和挤出材料。
本文件列出了表征聚甲醛模塑和挤出材料的性能和试验方法。这些性能选自通用试验方法。聚甲醛模塑和挤出材料的其他一些特别重要的或广泛使用的测试方法也包含在本文件中，以及特征性能：熔体流动速率和拉伸弹性模量。
为了获得可比的及有重现性的测试结果，旨在按照本文件所规定的样件制备过程及状态调节方法、试样尺寸和测试方法进行。采用不同试样尺寸或样件制备方法的测试数据未必会一致。

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GB/T 22271的本部分规定了聚甲醛(POM)模塑和挤塑材料通用品级产品的基本性能指标。本部分适用于聚甲醛均聚物、共聚物中通用品级(即未经改性)的材料，也适用于通用的粉状、粒状或片状材料。

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GB/T 27553的本部分规定了塑料（改性聚甲醛）-青铜-钢背三层复合自润滑板材的结构特点、技术要求、试验方法。
GB/T 27553的本部分适用于塑料（改性聚甲醛）-青铜-钢背三层复合自润滑板材（以下简称板材），该板材可经后序加工制成卷制轴套、止推垫片、滑块、导轨等形式的产品。

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GB/T 22271的本部分规定了聚甲醛（POM）热塑性材料分类基础的命名系统。 聚甲醛是由甲醛合成的长链均聚物和共聚物构成的热塑性材料。聚合物的主链是由甲醛聚合而成，其主要重复单元是—CH2O—。

定价： 29元 / 折扣价： 25 元 加购物车

GB/T 22271的本部分规定了聚甲醛模塑和挤出材料的试样的制备和性能测定的试验方法。给出了试样模塑前和试验前处理和状态调节的要求。 规定了试样制备的方法和条件，以及测量试样的方法。列出了表征聚甲醛模塑和挤出材料的性能和试验方法。 这些性能是从GB/T 19467—2004通用试验方法中选择出来的，其他对模塑和挤出材料广泛使用的或有重要意义的试验方法也同样包括在本标准中，诸如，在第1部分规定的指定性能、熔体流动速率和拉伸模量。 为了得到重复的、可比的试验结果，有必要采用本部分规定的试样制备方法和状态调节，试样尺寸和试验方法。不同尺寸或不同制备方法的试样得到的数据不可比。

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This classification covers polyoxymethylene materials suitable for molding and extrusion. This specification allows for the use of polyoxymethylene plastic materials that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or combination thereof, provided that the requirements as stated in this specification are met. Test specimens shall be molded by injection molding and all test pieces shall be tested as molded and conditioned in the standard laboratory atmosphere. The mechanical properties of the unreinforced and reinforced, filled, or lubricated polyoxymethylene materials shall be determined and shall conform to the following requirements: flow rate; melting point; tensile strength; tensile modulus; Charpy impact resistance; and deflection temperature.1.1 This classification system covers polyoxymethylene materials suitable for molding and extrusion. This classification system allows for the use of polyoxymethylene plastic materials that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or combination thereof, provided that the requirements as stated in this specification are met. It is the responsibility of the supplier and the buyer of recycled, reconstituted, recycled-regrind, recovered, or reprocessed polyoxymethylene plastic materials, or combination thereof, to ensure compliance. (See Guide D7209).1.2 The properties included in this standard are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications are to be specified by using suffixes as given in Section 5.1.3 This classification system and subsequent line callout (specification) are intended to provide a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastic field only after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherent properties of the material other than those covered by this standard.1.4 The values stated in SI units are to be regarded as the standard.1.5 The following precautionary caveat pertains only to the test method portion, Section 11, of this classification system. 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 1: This classification system is similar to ISO 29988-1/-2, although the technical content is significantly different.1.6 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.

定价： 590元 / 折扣价： 502 元 加购物车

1.1 This classification covers acetal materials suitable for molding and extrusion. This specification allows for the use of acetal plastic materials that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or combination thereof, provided that the requirements as stated in this specification are met. It is the responsibility of the supplier and the buyer of recycled, reconstituted, recycled-regrind, recovered, or reprocessed acetal plastic materials, or combination thereof, to ensure compliance. (See Guide D5033).1.2 The properties included in this classification are those required to identify the compositions covered. There may be other requirements necessary to identify particular characteristics important to specialized applications. These may be specified by using the suffixes as given in Section 5.1.3 This classification and subsequent line callout are intended to provide a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection should be made by those having expertise in the field of plastics design after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherent properties of the material other than those covered by this classification.1.4 The values stated in SI units are to be regarded as the standard.1.5 The following precautionary caveat pertains only to the test method portion, Section 11, of this classification. 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 and health practices and determine the applicability of regulatory limitations prior to use.Note 1--This classification is similar to ISO 9988-1 and 9988-2, although the technical content is significantly different.Note 2--This classification was revised in 1992 to include international 4-mm specimens and test procedures as the standard for compliance. The 3.2-mm specimens, test methods, and Tables POM, A, and B that were superceded by the revision are included in Appendix X2, as a reference for those wishing to use them. It is recommended that the material manufacturer be consulted on all callouts against this classification.

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This specification covers the requirements and test methods for the material, dimensions, workmanship, and properties of extruded, compression molded, and injection molded acetal shapes such as sheet, plate, rod, and tubular bar. The specimens shall be a pure polyoxymethylene or may filled, lubricated, or reinforced with carbon and graphite fiber, glass, PTFE, graphite, silicone, molybdenum disulfide, mineral, combinations of reinforcements or fillers, or both. The products shall conform to the physical property requirements which include tensile strength, elongation at break, tensile modulus, dimensional stability, flexural modulus, Izod impact, and porosity level. Thickness tolerance, length camber, and width bow properties shall also comply with the dimensional requirements of the different acetal shapes.1.1 This specification covers requirements and test methods for the material, dimensions, and workmanship, and the properties of extruded, compression molded and injection molded polyoxymethylene (POM) sheet, plate, rod, and tubular bar shapes, excluding pipe and fittings.1.2 The properties included in this specification are those required for the compositions covered. Section 4 presents a classification system for defining requirements for particular characteristics important to specialized applications.1.3 This specification allows for the use of recycled plastics.1.4 The values stated in inch-pound units are to be regarded as the standard in all property and dimensional tables. For reference purposes, SI units are included in Table S-POM and Table 1 only.1.5 The following precautionary caveat pertains only to the test method portions, Section 11, of this specification: 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 1: There is no known ISO equivalent to this standard.1.6 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.

定价： 590元 / 折扣价： 502 元 加购物车