1.1 本规程涵盖了根据抽样和检验确定预制板、预制块和管道、棉絮和毯子隔热材料批量装运可接受性的标准。 1.2 本规程旨在与适当的ASTM材料规范结合使用，这些规范根据资格要求和检验要求对产品的具体物理要求进行分类和描述。不合格的确定应基于材料规范中规定的单个样品测试值的公差。 1.3 这种做法可能需要与正常生产过程中进行的检查有很大不同的检查。如果买方要求按照此惯例进行抽样和验收，则买方应在订单或合同中予以规定。 1.4 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。 1.5 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。 1.6 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====== 4.1 本规程中规定的抽样和检验为买方提供了对来料的实际质量保证。它们基于成本/风险关系，被认为是为一般用途提供的预成型隔热材料的典型关系。在任何情况下，买方都应审查该做法，并根据其具体需求确定其适用性。 4.2 该程序主要用于连续批次的检查，偶尔不合格批次的可能性不大。消费者保护是基于生产商的经济压力，通过更大的批量拒绝风险，将过程平均值保持在90 % 一致性或更好。所用取样计划的运行特性曲线可在实践中找到 E2234 ，表X-C至表X-F。 4.3 本程序的目的不是评估批量质量、控制生产质量、免除供应商对所提供材料质量的责任，也不是在买方收到后确定缺陷材料的处理。

1.1 This practice covers criteria for establishing the acceptability of lots of shipments of preformed board, preformed block and pipe, and batts and blanket thermal insulation based on sampling and inspection. 1.2 This practice is intended for use in conjunction with appropriate ASTM material specifications that classify and describe the specific physical requirements for the product in terms of qualification requirements and inspection requirements. Determination of nonconformity shall be based on the tolerances for individual sample test values prescribed in the material specification. 1.3 This practice may require inspection substantially different from that performed in the normal course of production. If the purchaser requires sampling and acceptance inspection in accordance with this practice, he shall so specify in the order or contract. 1.4 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. 1.5 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. 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. ====== Significance And Use ====== 4.1 The sampling and inspection prescribed in this practice afford the purchaser a practical level of quality assurance on incoming material. They are based on cost/risk relationships considered typical for preformed thermal insulations offered for general use. In all cases, the purchaser should review this practice and determine its suitability in terms of his specific needs. 4.2 This procedure is intended primarily for the inspection of a continuing stream of lots, and there is not a high probability of rejecting occasional off lots. Consumer protection is based on economic pressure on the producer, through greater risk of lot rejection, to maintain the process average at 90 % conformance or better. Operating characteristic curves for the sampling plans employed can be found in Practice E2234 , Table X-C through Table X-F. 4.3 It is not the intent of this procedure to estimate lot quality, control the quality of production, relieve the supplier of responsibility for the quality of material offered, or determine the disposition of material found to be defective after receipt by the purchaser.