1.1 该分类涵盖了按应用和结构指定运输应用的多层钢（MLS）和其他金属层垫片的方法。这些结构由一层或多层钢或金属材料组成，可能有涂层或浮雕。指定为复合垫片或包封垫片的商业材料不包括在本分类中，并包含在本分类中 F868 和实践 F336 分别地 1.2 由于不包括所有有助于垫片性能的特性，因此将该分类作为选择MLS或金属层垫片的基础是有限的。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管要求的适用性。 ====意义和用途====== 4.1 该分类旨在促进MLS和金属层垫片性能报告的一致性，为制造商和用户之间的沟通提供通用语言，并指导工程师和设计师应用和制造商用垫片。 （A） 该分类也可用于对单层钢（SLS）垫片进行分类。 （B） 参考规范 A666型 或规格 A109/A109M 分别适用于不锈钢和低碳钢。表中未提及或规范未涵盖的其他金属 A666型 或规格 A109/A109M 必须由生产商/用户定义（即H–高温合金）。 （C） 参考实践 D1418 有关橡胶涂层类型和使用分类的一般信息 D2000 定义橡胶的物理特性。 该物理特性信息通常在垫片图纸或客户规范中指定，或在两者中指定。 （D） 零件图上规定的涂层面。 4.2 后缀 表2 用于指定活动、非活动或负载止动器的硬度。 4.2.1 如果不使用后缀，则仅从 表1 是必需的。如果后缀用于1层，则必须为所有层指定后缀，即使使用“0”。不能假设相同层的硬度相同；如果使用，必须单独指定所有层。 指定的第一层必须在零件图上标明。要使用硬度标注，请在基础标注的末尾留下一个空格，后跟“HR”后缀，并带有一系列后缀号，以指定每个层的硬度。 4.2.1.1 示例:ASTM F2325、A32ANBW11 HR252- 示例来自 表1 修改为增加三个金属层的硬度要求。活动层1和3被指定为相同， 1. / 4. 硬钢。塞层2指定为全硬钢。

1.1 This classification covers a means for specifying Multi-Layer Steel (MLS) and other Metal Layer Gaskets for Transportation Applications by application and construction. These structures are composed of one or more steel or metal layers of material, which may have coatings or embossments. Commercial materials designated as composite or enveloped gaskets are excluded from this classification and are covered by Classification F868 and Practice F336 , respectively. 1.2 Since all of the properties that contribute to gasket performance are not included, use of this classification as a basis for selecting an MLS or Metal Layer gasket is limited. 1.3 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 requirements prior to use. ====== Significance And Use ====== 4.1 This classification is intended to encourage uniformity in reporting properties of MLS and Metal Layer gaskets, to provide a common language for communications between producers and users, and to guide engineers and designers in the application and construction of commercially available gaskets. (A) This classification may also be used to classify Single Layer Steel (SLS) Gaskets. (B) Refer to Specification A666 or Specification A109/A109M for Stainless Steel and Low Carbon Steel, respectively. Other metals not referenced in the table or not covered by Specification A666 or Specification A109/A109M must be defined by the producer/user (that is, H – High Temperature Alloy). (C) Refer to Practice D1418 for general information regarding rubber coating types and use Classification D2000 to define the physical properties of the rubber. This physical property information is typically specified on the gasket drawing or the customer specification, or both. (D) Coated side as specified on part drawing. 4.2 Suffix Table 2 is provided to allow hardness designation for Active, Inactive, or Load Stoppers. 4.2.1 If suffixes are not to be used, only the basic callout from Table 1 is required. If a suffix is used for 1 layer, it must be specified for all layers, even if a “0” is used. It cannot be assumed that hardnesses of like layers are the same; if used, all layers must be specified separately. The first layer specified must be indicated on the part drawing. To use a hardness call-out, at the end of the base callout leave a space followed by the “HR” suffix with a series of suffix numbers to specify the hardnesses for each layer. 4.2.1.1 Example: ASTM F2325, A32ANBW11 HR252— Example from Table 1 modified to add hardness requirement for the three metal layers. Active layers 1 and 3 are designated to be the same, 1 / 4 hard steel. Stopper layer 2 is designated to be full hard steel.