ASTM_D_1764_-_97.pdf

Designation:D 1764 97An American StandardApproved bySociety of Automotive EngineersSAE Standard J 19Standard Specification forRubber Latex Products for Automotive Applications1This standard is issued under the fixed designation D 1764;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the 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.1.Scope1.1 This specification covers dipped goods and coatingsmade from compounded latex.Products manufactured fromthis material include boots,coated clips,coated sponge parts,and coated fabrics for automotive applications.1.2 The compounds listed in Table 1 and Table 2 aregrouped in classifications based primarily on physical proper-ties,which are prescribed in the tables.These values,togetherwith any additional requirements indicated by suffix letters inthe grade designations as described in Section 2,define theproperties of the compounds after vulcanization.These valuesapply to test specimens obtained from standard laboratory-dipped films prepared in accordance with procedures describedin the applicable ASTM methods.Test results from finishedproducts may not duplicate the values obtained fromstandard test films.When differences due to the difficulty inobtaining suitable test specimens from the finished part arise,the purchaser and the supplier may agree on acceptabledeviations.This can be done by comparing results obtained onstandard test films with those obtained on actual parts.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:D 412 Test Methods for Vulcanized Rubber and Thermo-plastic Rubbers and Thermoplastic ElastomersTension2D 471 Test Method for Rubber PropertyEffect of Liq-uids2D 573 Test Method for RubberDeterioration in an AirOven2D 746 Test Method for Brittleness Temperature of Plasticsand Elastomers by Impact3D 925 Test Methods for Rubber PropertyStaining of Sur-faces(Contact,Migration,and Diffusion)2D 2240 Test Method for Rubber PropertyDurometerHardness2D 5964 Practice for Rubber IRM 902 and IRM 903 Re-placement Oils for ASTM No.2 and ASTM No.3 Oils23.Types,Classes,and Grades of Compounds3.1 TypesThis specification covers two types of com-pounds designated by the prefix letters LR and LS,as follows:3.1.1 Type LRCompounds made from natural rubber,synthetic rubber,or rubber-like materials,alone or in combi-nation,for services where specific resistance to the action ofpetroleum-base fluids is not required.3.1.2 Type LSCompounds made from synthetic rubber orrubber-like materials for services where specific resistance tothe action of petroleum-base fluids is required.1This specification is under the jurisdiction of ASTM Committee D-11 onRubber and is the direct responsibility of Subcommittee D11.30 on Classification ofRubber Compounds.Current edition approved Feb.10,1997.Published March 1997.Originallypublished as D 1764 60.Last previous edition D 1764 91.2Annual Book of ASTM Standards,Vol 09.01.3Annual Book of ASTM Standards,Vol 08.01.TABLE 1 Physical Requirements of Type LR Compounds,Non-Oil ResistantGrade No.LR420Durometer hardness,points45 6 5Tensile strength,min,MPa(psi)14.0(2000)Ultimate elongation,min,%500Heat aged 70 h at 70C(158F)Change in durometer hardness,max65Tensile strength,min,MPa(psi)10.5(1500)Ultimate elongation,min,%400Permanent set,max at 400%10elongation,%TABLE 2 Physical Requirements of Type LS Compounds,ClassLSC,Oil ResistantGrade No.LSC515Basic requirements:Durometer hardness,points55 6 5Tensile strength,min,MPa(psi)10.5(1500)Ultimate elongation,min,%400Oil immersion 22 h at 100C(212F)ASTM Oil No.2:580Volume change,max,%Heat aged 70 h at 100C(212F)+10Change in durometer hardness,max8.5(1200)Tensile strength,min,MPa(psi)300Ultimate elongation,min,%20Permanent set,max at 300%elongation,%Added requirements:50Suffix E2,22 h at 100C(212F)inASTM Oil No.2:5Volume change,max,%1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMNOTICE:Thisstandardhaseitherbeensupercededandreplacedbyanewversionordiscontinued.ContactASTMInternational(www.astm.org)forthelatestinformation.3.2 ClassesType LR compounds are of one class only.Type LS compounds are divided into two classes,LSB4andLSC,as follows:3.2.1 Class LSBCompounds made from synthetic rubberor rubber-like materials having low volume swell in lowaniline point oils5.3.2.2 Class LSCCompounds made from synthetic rubberor rubber-like materials having medium volume swell in lowaniline point oils.3.3 GradesEach class of the compounds may have anumber of different grades,each having different physicalproperties.The grade shall be designated by a grade numberfollowing the prefix letters and,when necessary,by suffix