1、Designation:D 21 35-83 4 C T b AMERICAN SOCIETY FOR TESTING AND MATERIALS Reprinfed from the Annual Book of ASTM Standards,Copyright ASTM If not listed in the current combined index,will appear in the next edition.1916 Race St.,Philadelphia,Pa.19103 Standard Classification of HARD RUBBERS This stand
2、ard is issued under the fixed designation D 2135;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(E)indicates an editorial
3、change since the last revision or reapproval.l.Scope 1.1 This classification covers the mechani-describes the required property levels of a ma-cal,electrical,and chemical properties of hard rubber products prepared from new or re-claimed natural and synthetic rubber.1.2 The values stated in either a
4、cceptable metric units or in other units shall be regarded separately as standard.The values stated in each system may not be exact equivalents.Therefore,each system must be used independ-ently of the other,without combining values in any other way.2.Applicable Documents 2.1 ASTM Sandards:D 149 Test
5、s for Dielectric Breakdown Volt-age and Dielectric Strength of Electrical Insulating Materials at Commercial Power Frequencies D 150 Tests for A-C Loss Characteristics and Permittivity(Dielectric Constant)of Solid Electrical Insulating Materials D 256 Tests for Impact Resistance of Plastics and Elec
6、trical Insulating Materials D 257 Tests for D-C Resistance or Conduct-ance of Insulating Materials D 530 Testing Hard Rubber Products3 D 570 Test for Water Absorption of Plastics4 D 648 Test for Deflection Temperature of D 790 Test for Flexural Properties of Plastics D 2240 Test for Rubber Property-
7、Durom-D 2707 Testing Hard Rubber in Tension3 Plastics Under Flexural Load4 and Electrical Insulating Materials4 eter Hardness3 3.Significance and Use 3.1 The purpose of this classification is to provide a concise,easy to use designation,that 4.Descriptions of Terms 4.1 Hard Rubber as used herein sha
8、ll be understood to refer to compositions having combined sulfur in excess of 15%.4.2 Rubber as used herein shall be under-stood to include polybutadiene and polyiso-prene and their respective copolymers.4.3 Product as used herein shall be under-stood to include sheet,rod,tube,and molded items.5.Cla
9、sses and Grades 5.1 Classes-This classification describes two classes of hard rubber:5.1.1 Class G-A general-purpose hard rub-ber with average requirements.5.1.2 Class R-A hard rubber with added special requirements.5.2 Grades-This classification provides for as many grades of hard rubber as may be
10、selected from the possible combinations of re-quirements in Table 1.A grade is designated by indicating first the class followed by column numbers for each property in the order in which they are listed in Table 1.Where there is no interest i n a property a“O”is inserted in place of a column number.
11、5.3 Special requirements(R).when appli-cable,are appended to general purpose require-This classification is under the jurisdiction of ASTM Committee D-I 1 on Rubber and is the direct responsibility of Subcommittee D 11.10 on Physical Testing.Current editionapproved March 25.1983.Published May 1983.O
12、riginally published as D 2135-62 T.Last previous edi;ioo D 2135-67(1979).1983 Annual Book of ASTM Standards,Vol 10.02.1983 Annual Book ofASTM Standards,Vol 09.01.1983 Annual Book o f ASTM Smndards,Vol 08.01,1 NOTICE:This standard has either been superseded and replaced by a new version or discontinu
13、ed.Contact ASTM International(www.astm.org)for the latest information.-.-.-._.-.I.-I._.-.9009276 0024833 665.-.ments and are covered by suffur letters,each of which identifies the property specified,and is followed by the column number which identi-fes the range within which the property is limite d
14、.NOTE-Examples of this classification system are as follows:(u)A general-purpose hard rubber might be de-scribed as follows:Tensile strength,min,4 1.4 MPs Elongation(unspecified)Hardness,Type D durometer,min(74)(6000 psi)Impact(0.50 ft lb/in.)(b)A hard rubber with special requirements might be descr
15、ibed as follows:R-4035A3E4 Tensile strength.min.4 1.4 MPa I I i iTT(6000 psi)Elongation(unspecified)Hardness,TvDe D durometer.min Impait resistance,min,27.0 J/m(264 psi)min,60C(140F)-(0.50 ft Ib/in.)Distortion temperature at 1.8 1 MPa Dielectric strength at 60 Hz,min,15.8 kV/mm(400/mil)6.Test Method
16、s 6.1 The properties enumerated in the clas-sification shall be determined in accordance with the following methods and modified as stated herein:D 2135 6.1.1 Tensile Strength and Elongation-1Method D 2707.6.1.2 Hardness,Type D Durometer-Method D 2240.6.1.3 Impact Resistance(Izad)-Methods D 256,with the expections stated in Methods D 530.6.1.4 Heat Distortion-Method D 648.6.1.5 Cold Flow-Methods D 530.6.1.6 Flexural Strength-Methods D 790.6.1.7 Water Absorption-Section 3 of Method D 570,as quali
