Home>ASTM Standards>ASTM F2325-14(R2020) pdf free download

ASTM F2325-14(R2020) pdf free download

ASTM F2325-14(R2020) pdf free download.Standard Classification for Multi-Layer Steel (MLS) and Other Metal Layer Gaskets for Transportation Applications
1. Scope
1.1 This classification covers a means for specifying Multi- Layer Steel (MLS) and other Metal Layer Gaskets for Trans- portation 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. Commer- cial materials designated as composite or enveloped gaskets are excluded from this classification and are covered by Classifi- cation 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 active layer(s)—an embossed layer(s) used to provide the primary sealing function. 3.1.2 embossment (emboss)—a raised area of a steel or metal layer in relief from the rest of the layer with a defined geometry typically used at the sealing interface. Embossments may also be used to shift load to areas, which require better sealing performance. 4 3.1.3 exterior coating—a supplemental coating applied to the exterior of the gasket for anti-fret, anti-blocking, or sealing enhancement. 3.1.4 inactive layer(s)—the flat or non-embossed layer(s) used for spacing or other purposes within the gasket. 3.1.5 load stop (stopper)—a device used to control com- pression on Single Layer Steel (SLS) or between layers in an MLS or Metal Layer gasket.
4. 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. 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 oflike 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. 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.
5. Basis of Classification
5.1 This classification is based on the principle that MLS and Metal Layer gaskets should be described, in terms of the transportation application and construction. Thus, users of MLS and Metal Layer gaskets can, by selecting different combinations, define various parts needed for specific applica- tions. Likewise, producers can report applications and con- struction of available products.

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