1、Designation: D 3832 79 (Reapproved 2006)Standard Specification forRubber Seals Contacting Liquids in Solar Energy Systems1This standard is issued under the fixed designation D 3832; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, t
2、he year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers
3、 the general requirements formaterials used in preformed rubber seals that contact thecirculating liquid in solar energy systems. Particular applica-tions may necessitate other requirements that would takeprecedence over these requirements when specified.1.2 This specification does not include requi
4、rements per-taining to the design, fabrication, or installation of the seals.2. Referenced Documents2.1 ASTM Standards:2D 395 Test Methods for Rubber PropertyCompressionSetD 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 471 Test Method for Rubber PropertyEffect of Liqu
5、idsD 1149 Test Method for Rubber DeteriorationSurfaceOzone Cracking in a ChamberD 1229 Test Method for Rubber PropertyCompressionSet at Low TemperaturesD 1349 Practice for RubberStandard Temperatures forTestingD 1415 Test Method for Rubber PropertyInternationalHardnessD 1566 Terminology Relating to
6、RubberD 2137 Test Methods for Rubber PropertyBrittlenessPoint of Flexible Polymers and Coated FabricsD 3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standard Compounds and Prepar-ing Standard Vulcanized SheetsD 3183 Practice for RubberPreparation of Pieces for TestPurposes f
7、rom Products2.2 Other Standards:RMA HandbookRubber Products: Molded, Extruded,Lathe Cut, and Cellular33. Terminology3.1 Refer to the definitions of terms in Terminology D 1566.4. Classification4.1 Types:4.1.1 Type C, intended for use in cold climates (below10C in winter).4.1.2 Type W, intended for u
8、se in warm climates (above10C in winter).4.2 Grades:4.2.1 Grade designations represent differing degrees ofhardness in accordance with Test Method D 1415 as follows:4.2.1.1 Grade 3, hardness of 30 6 5.4.2.1.2 Grade 4, hardness of 40 6 5.4.2.1.3 Grade 5, hardness of 50 6 5.4.2.1.4 Grade 6, hardness o
9、f 60 6 5.4.2.1.5 Grade 7, hardness of 70 6 5.4.2.1.6 Grade 8, hardness of 80 6 5.NOTE 1The grade to be used in a particular application depends onthe design of the seal and must be specified by the designer.4.3 Classes:4.3.1 Seals shall be classified as follows:4.3.1.1 Class A, seals for use with aq
10、ueous liquids at amaximum service temperature of 100C.4.3.1.2 Class AT, seals for use with aqueous liquids at amaximum service temperature above 100C.4.3.1.3 Class N, seals for use with nonaqueous liquids.NOTE 2Aqueous liquids include water and antifreeze solutions.5. Ordering Information5.1 Orders
11、for seals under this specification shall include thefollowing information:5.1.1 ASTM designation and year of issue,5.1.2 Type, grade, and class,5.1.3 Design and dimensions of seal,1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommi
12、ttee D11.36 on Seals.Current edition approved July 1, 2006. Published July 2006. Originally approvedin 1979. Last previous edition approved in 2001 as D 3832 79 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual
13、 Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from the Rubber Manufacturers Association (RMA), 444 MadisonAve., New York, NY 10022.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
14、59, United States.5.1.4 Contacting liquid,5.1.5 Maximum service temperature, and5.1.6 Quantity.6. Dimensions6.1 The tolerances in dimensions shall conform to thefollowing designations in the RMA Handbook.6.1.1 Molded Seals:6.1.1.1 Commercial DimensionsRMA A3-F3-T.032.6.1.1.2 Critical DimensionsRMA A
15、2-F3-T.032.6.1.2 Extruded Seals:6.1.2.1 Commercial DimensionsRMA A2-F3.7. Workmanship, Finish, and Appearance7.1 Seals shall be free of blisters, checks, cracks, and otherimperfections that can affect their ability to make or maintaina liquid-tight seal.8. Test Methods8.1 Prepare the specimens in ac
16、cordance with PracticeD 3183 and test the specimens in accordance with the testmethods given in 8.2. For control of production, specimensmay be taken from standard test sheets prepared in accordancewith Practice D 3182, using the same unvulcanized materialused to prepare the seals and vulcanizing th
17、e material at thesame temperature used for the seals to an equivalent state ofvulcanization.8.2 Determine ultimate elongation in accordance with TestMethods D 412. Determine other requirements in accordancewith the methods specified in Table 2.8.3 Test Class A seals for heat resistance and compressi
18、onset at a temperature of 125C and for resistance to liquids at atemperature of 100C.8.4 Test Class AT and Class N seals for heat resistance andcompression set at the standard test temperature in accordancewith Practice D 1349, that is, between 25 and 49C above themaximum service temperature, and fo
19、r resistance to liquids atthe standard test temperature, that is, between 1 and 25Cabove the maximum service temperature. The standard testtemperatures shall not be less than those for Class A seals.Above 125C, the standard test temperatures are 150, 175, 200,225, and 250C.8.5 Using the liquid in se
20、rvice for the particular heat-transport system, test in accordance with Test Method D 471.9. Requirements9.1 Seals shall be vulcanized from suitable rubber com-pounds and conform to the requirements given in Table 1 andTable 2.10. Precision and Bias10.1 Aprecision and bias statement is not necessary
21、 for thisspecification as it is a listing of material requirements.11. Inspection and Rejection11.1 Manufacturers of seals may use their quality-controlsystems for production inspection to assure the seals conformwith this specification, provided appropriate records are kept.In case of dispute regar
22、ding the quality of a delivered product,a sample of five seals shall be taken from the lot and tested forcompliance with this specification. If one of the five seals doesnot conform, a second sample of five seals may be taken andtested. If two or more of the ten seals do not conform, the lotmay be r
23、ejected.12. Product Marking12.1 The following information may be marked on eitherthe seal, packaging, label or tag:12.1.1 Name, brand, or trademark of the manufacturer,12.1.2 Type and grade,TABLE 1 Elongation Requirements for Rubber Seals in LiquidHeat-Transport SystemsGrade Ultimate Elongation, min
24、, %3 3504 3005 2506 2007 1508 100TABLE 2 Other Requirements for Rubber Seals in Liquid Heat-Transport SystemsProperty Unit Requirement ASTM Test MethodCompression set:High temperatureA% 30 max D 395, Method BLow temperatureB% 60 max D 1229Resistance to Heating:CHardness change IRHD 10 max D 1415Ulti
25、mate elongation change % of original 30 max D 412Resistance to ozone,D100 mPa, for 166 hat 40C no cracking D 1149Resistance to low temperatureEC 40 max D 2137Resistance to Liquid:FVolume change % + 40 to 10 D 471Hardness change IRHD 610 D 1415AAfter compression for 70 h at the temperature specified
26、in 8.3 or 8.4.BAfter compression for 166 h at 10C. Set shall be measured at 10 s after force is released. Lubricated plates or polytetrafluoroethylene film is recommended if therubber adheres to the metal plates during the test.CCondition for 166 h at the temperature specified in 8.3 or 8.4.DThis re
27、quirement applies only to seals that are exposed to outside atmospheres.EThis requirement applies to Type C seals only.FRubber shall be immersed in liquid used in service for 166 h at the temperature specified in 8.3 or 8.4.D 3832 79 (2006)212.1.3 Compliance with this specification, ASTM Specifi-cat
28、ion D 3832, and12.1.4 Any other information required by the manufactureror the purchaser.13. Packaging13.1 Material shall be protected by suitable packaging toprevent damage during shipment or storage prior to installationin solar collector.14. Keywords14.1 liquids; rubber seals; solar energy system
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30、e entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standa
31、rdsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible 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 Commit
32、tee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 3832 79 (2006)3
