1、Designation: D3832 79 (Reapproved 2011)Standard Specification forRubber Seals Contacting Liquids in Solar Energy Systems1This standard is issued under the fixed designation D3832; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 th
3、e 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 requirem
4、ents per-taining to the design, fabrication, or installation of the seals.2. Referenced Documents2.1 ASTM Standards:2D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD1
5、149 Test Methods for Rubber DeteriorationCrackingin an Ozone Controlled EnvironmentD1229 Test Method for Rubber PropertyCompression Setat Low TemperaturesD1349 Practice for RubberStandard Temperatures forTestingD1415 Test Method for Rubber PropertyInternationalHardnessD1566 Terminology Relating to R
6、ubberD2137 Test Methods for Rubber PropertyBrittlenessPoint of Flexible Polymers and Coated FabricsD3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standard Compounds and Prepar-ing Standard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from
7、Products2.2 Other Standards:RMA HandbookRubber Products: Molded, Extruded,Lathe Cut, and Cellular33. Terminology3.1 Refer to the definitions of terms in Terminology D1566.4. Classification4.1 Types:4.1.1 Type C, intended for use in cold climates (below10C in winter).4.1.2 Type W, intended for use in
8、 warm climates (above10C in winter).4.2 Grades:4.2.1 Grade designations represent differing degrees ofhardness in accordance with Test Method D1415 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 of 60 6
9、 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 aqueous
10、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 for se
11、als 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,5.1.4 Contacting liquid,5.1.5 Maximum service temperature, and1This specification is under the jurisdiction ofASTM Committee D
12、11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics, RubberThreads and Seals.Current edition approved Nov. 1, 2011. Published January 2012. Originallyapproved in 1979. Last previous edition approved in 2006 as D3832 79 (2006).DOI: 10.1520/D3832-79R11.2For referenced
13、 ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from the Rubber Manufacturers Association (RMA), 444 MadisonAve.,
14、 New York, NY 10022.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1.6 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 Dim
15、ensionsRMA A3-F3-T.032.6.1.1.2 Critical DimensionsRMA A2-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-ti
16、ght seal.8. Test Methods8.1 Prepare the specimens in accordance with PracticeD3183 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 D3182, using the same unvulcanized
17、 materialused to prepare the seals and vulcanizing the material at thesame temperature used for the seals to an equivalent state ofvulcanization.8.2 Determine ultimate elongation in accordance with TestMethods D412. Determine other requirements in accordancewith the methods specified in Table 2.8.3
18、Test Class A seals for heat resistance and compressionset 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 D1349, that is, between 25 a
19、nd 49C above themaximum service temperature, and for 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
20、, 175, 200,225, and 250C.8.5 Using the liquid in service for the particular heat-transport system, test in accordance with Test Method D471.9. 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 Bias1
21、0.1 Aprecision and bias statement is not necessary 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 app
22、ropriate records are kept.In case of dispute regarding 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 mor
23、e of the ten seals do not conform, the lotmay be rejected.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,12.1.3 Compliance with this specification, ASTM Specifi-cati
24、on D3832, and12.1.4 Any other information required by the manufactureror the purchaser.TABLE 1 Elongation Requirements for Rubber Seals in LiquidHeat-Transport SystemsGrade Ultimate Elongation, min, %3 3504 3005 2506 2007 1508 100TABLE 2 Other Requirements for Rubber Seals in Liquid Heat-Transport S
25、ystemsProperty Unit Requirement ASTM Test MethodCompression set:High temperatureA% 30 max D395, Method BLow temperatureB% 60 max D1229Resistance to Heating:CHardness change IRHD 10 max D1415Ultimate elongation change % of original 30 max D412Resistance to ozone,D100 mPa, for 166 hat 40C no cracking
26、D1149Resistance to low temperatureEC 40 max D2137Resistance to Liquid:FVolume change % + 40 to 10 D471Hardness change IRHD 610 D1415AAfter compression for 70 h at the temperature specified in 8.3 or 8.4.BAfter compression for 166 h at 10C. Set shall be measured at 10 s after force is released. Lubri
27、cated 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 requirement applies only to seals that are exposed to outside atmospheres.EThis requirement applies to Type C sea
28、ls only.FRubber shall be immersed in liquid used in service for 166 h at the temperature specified in 8.3 or 8.4.D3832 79 (2011)213. Packaging13.1 Material shall be protected by suitable packaging toprevent damage during shipment or storage prior to installationin solar collector.14. Keywords14.1 li
29、quids; rubber seals; solar energy systemsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and th
30、e 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 reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision o
31、f this standard or for additional standardsand 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 should
32、make 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 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D3832 79 (2011)3
