1、Designation: F868 02 (Reapproved 2009)F868 17Standard Classification forLaminated Composite Gasket Materials1This standard is issued under the fixed designation F868; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last
2、 revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification covers a means for specifying or describing pertinent properties of commercial laminate composite gasketma
3、terials (LCGM). These structures are composed of two or more chemically different layers of material. These materials may beorganic or inorganic, or combinations with various binders or impregnants. Gasket coatings are not covered since details thereofare intended to be given on engineering drawings
4、, or as separate specifications. Commercial materials designated as envelopedgaskets are excluded from this classification; they are covered in Practice F336. This classification system does not covermultilayer steel (MLS) gaskets currently used for some automotive exhaust and head gaskets. MLS gask
5、ets are classified underClassification F2325.1.2 Since all of the properties that contribute to gasket performance are not included, use of this classification as a basis forselecting LCGM is limited.1.3 The values stated in SI units are to be regarded as the standard. The values given in parenthese
6、s are for information only.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations pri
7、or to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barr
8、iers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel, Strip, Carbon (0.25 Maximum Percent), Cold-RolledD2000 Classification System for Rubber Products in Automotive ApplicationsF104 Classification System for Nonmetallic Gasket MaterialsF146 Test
9、 Methods for Fluid Resistance of Gasket MaterialsF336 Practice for Design and Construction of Nonmetallic Enveloped Gaskets for Corrosive ServiceF433 Practice for Evaluating Thermal Conductivity of Gasket MaterialsF1276 Test Method for Creep Relaxation of Laminated Composite Gasket MaterialsF2325 Cl
10、assification for Multi-Layer Steel (MLS) and Other Metal Layer Gaskets for Transportation Applications3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 boardthe term board is used in the context of a thick (generally greater than 1.52 mm (0.060 in.) and rigid nonmetallicmaterial
11、 often purchased in sheet or strip form.3.1.2 composite gasket materiala gasket structure composed of two or more different materials joined together in flat, parallellayers.1 This classification is under the jurisdiction of ASTM Committee F03 on Gaskets and is the direct responsibility of Subcommit
12、tee F03.30 on Classification.Current edition approved May 1, 2009May 1, 2017. Published May 2009May 2017. Originally approved in 1984. Last previous edition approved in 20022009 asF868 02.F868 02 (2009). DOI: 10.1520/F0868-02R09.10.1520/F0868-17.2 For referencedASTM standards, visit theASTM website,
13、 www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of
14、 what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered
15、 the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. Significance and Use4.1 This classification is intended to encourage uniformity in reporting properties; to provide a common language forcommunications between
16、producers and users; to guide engineers and designers in the use, construction, and properties ofcommercially available materials; and to be versatile enough to cover new materials and test methods as they are introduced.5. Basis of Classification5.1 This classification is based on the principle tha
17、t LCGM should be described, insofar as possible, in terms of use,composition, combining method, and specific physical and mechanical characteristics. Thus, users of gasket materials can, byselecting different combinations of materials and properties, define various parts. Suppliers, likewise, can re
18、port uses, composition,and properties of available products.6. Numbering System6.1 To permit line call-out of the description mentioned in 5.1, this classification establishes letter or number symbols todescribe use, composition, and physical properties and performance levels of certain properties.6
19、.2 In specifying or describing gasket materials, each line call-out shall include the number of this system and a number andletter series describing the use, composition, and combining method plus suffix call-out, as shown in Table 1.6.3 To further specify or describe gasket materials, each line cal
20、l-out may include one or more suffix letter-numeral symbols,as listed in Table 2.7. Physical and Mechanical Properties7.1 Gasket materials identified by this classification shall have a number and letter call-out for end-use and constructionindicated in Table 1 and additional properties by a letter-
21、numeral call-out shown in Table 2.8. Thickness Requirements8.1 Gasket materials identified by this classification shall conform to the thickness specified on the gasket drawing or on theorder.8.2 The thickness of individual components of the composite may be specified on the drawing, where necessary
22、, and wherecomponents can be measured.9. Sampling9.1 Specimens shall be selected from finished gaskets or sheets of suitable size, whichever is the more practicable. If finishedgaskets are used, the dimensions of sample and any variations from method must be reported.F868 1729.2 Sufficient specimens
23、 shall be selected to provide a minimum of three determinations for each test specified. The average ofthe determinations shall be considered as the result.TABLE 2 Supplementary Physical and Mechanical CharacteristicsSuffix Symbol Supplementary CharacteristicsA9 Sealability characteristics determine
24、d as agreed upon between supplier and user.C9 Compressibility characteristics as agreed upon between producer and user.D9 Release characteristics determined as agreed upon between supplier and user.E00 through E99 Weight and thickness change after immersion in ASTM Fuel B shall be determined in acco
25、rdance with Test MethodsF146.Weight increase shall not exceed the standard rating number indicated by the first numeral of the two-digit numberof the E-/symbol.Thickness increase shall not exceed the standard rating indicated by the second numeral of the E-/symbol.Percent Weight Increase(first numer
26、al)Percent Thickness Increase(second numeral)E0_ = not specified E_0 = not specifiedE1_ = 10 E_1 = 05E2_ = 15 E_2 = 010E3_ = 20 E_3 = 015E4_ = 30 E_4 = 520E5_ = 40 E_5 = 1025E6_ = 50 E_6 = 1535E7_ = 60 E_7 = 2545E8_ = 100 E_8 = 3060E9_ = as specified E_9 = as specifiedG00 through G99 Weight and thic
27、kness change after immersion in ASTM #3 Oil shall be determined in accordance with TestMethods F146.Weight increase shall not exceed the standard rating number indicated by first numeral of the two-digit numberof the G-/symbol. Thickness increase shall not exceed the standard rating number indicated
28、 by the second nu-meral of the G-/symbol.Percent Weight Increase(first numeral)Percent Thickness Increase(second numeral)G0_ = not specified G_0 = not specifiedG1_ = 10, max G_1 = 015G2_ = 15, max G_2 = 520G3_ = 20, max G_3 = 1025G4_ = 30, max G_4 = 1530G5_ = 40, max G_5 = 2040G6_ = 60, max G_6 = 30
29、50G7_ = 80, max G_7 = 4060G8_ = 100, max G_8 = 5070G9_ = as specified G_9 = as specifiedH1 through H9 Creep relaxation characteristics shall be determined in accordance with Test Method F1276. Loss of stress atthe end of the test shall not exceed the amount indicated by the numeral of the H-/symbol.
30、H1 = 10 % H5 = 30 %H2 = 15 % H6 = 40 %H3 = 20 % H7 = 50 %H4 = 25 % H9 = as specifiedK0 through K9 Thermal conductivity characteristics shall be determined in accordance with Practice F433. The K-factor ob-tained in W/mK (Btuin./hft2F), shall fall within the ranges indicated by the numeral of a K-/sy
31、mbol.K1 = 0. to 0.09 (0 to 0.65)K2 = 0.07 to 0.17 (0.50 to 1.15)K3 = 0.14 to 0.24 (1.00 to 1.65)K4 = 0.22 to 0.31 (1.50 to 2.15)K5 = 0.29 to 0.38 (2.00 to 2.65)K6 = 0.36 to 0.45 (2.50 to 3.15)K7 = 0.43 to 0.53 (3.00 to 3.65)K8 = 0.50 to 0.60 (3.50 to 4.15)K9 = as specifiedAL9 Laminated bond characte
32、ristics as agreed upon between producer and user.X9 Crush-extrusion resistance characteristics as agreed upon between producer and user.Y9 Coating(s) per drawing details.Z0 through Z9 Any other properties per drawing details.A On engineering drawings or other supplements to this classification.F868
33、17310. Conditioning10.1 Prior to all tests, specimens shall be conditioned as follows:10.1.1 When all Classification F104 layers of the composite are of the same “type,” condition per that type.10.1.2 When the layers of the composite are of different Classification F104 “types,” the composite shall
34、be conditioned 22 hin a controlled humidity room, or in a closed chamber containing air at 21 to 30C (70 to 86F) and 50 to 55 % relative humidity.10.1.3 Other conditioning may be used as agreed upon between producer and user.11. Test Methods11.1 The test methods are indicated in Table 2 under each s
35、uffix symbol when appropriate. Results must be reported as specifiedin each test method used.12. Keywords12.1 classification; composite; gasket materials; laminatedASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this
36、standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be r
37、eviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of therespons
38、ible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West
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