1、Designation:D384701(Reapproved 2018)Standard Practice forRubberDirections for Achieving Subnormal TestTemperatures1This standard is issued under the fixed designation D3847;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the general requirements forachieving and maintaining temperatures below 21C for ther-mal conditioning
3、 and physical testing of rubber.1.2 This practice describes the acceptable types and con-struction of low-temperature cabinets for conditioning andtesting of rubber,the composition and circulation of heat-transfer media,and the required uniformity and precision oftemperature control.1.3 The values s
4、tated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,heal
5、th,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Internati
6、onal Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D746 Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD832 Practice for Rubber Conditioning For Low Tempera-t
7、ure TestingD945 Test Methods for Rubber Properties in Compression orShear(Mechanical Oscillograph)D1053 Test Methods for Rubber PropertyStiffening atLow Temperatures:Flexible Polymers and Coated FabricsD1229 Test Method for Rubber PropertyCompression Setat Low TemperaturesD1329 Test Method for Evalu
8、ating Rubber PropertyRetraction at Lower Temperatures(TR Test)D1415 Test Method for Rubber PropertyInternationalHardnessD2136 Test Method for Coated FabricsLow-TemperatureBend TestD2137 Test Methods for Rubber PropertyBrittleness Pointof Flexible Polymers and Coated FabricsD2240 Test Method for Rubb
9、er PropertyDurometer Hard-nessD2632 Test Method for Rubber PropertyResilience byVertical ReboundE197 Specification for Enclosures and Servicing Units forTests Above and Below Room Temperature(Withdrawn1981)33.Significance and Use3.1 Low temperatures are often needed for conditioning ofrubber prior t
10、o testing,as well as during the test.Conditioningis required to attain a specific temperature that is uniformthroughout the specimen or for producing time-dependenteffects.Specimens may be conditioned and tested in the sameor different chambers.3.2 This practice is intended to apply particularly,but
11、 notexclusively,to the following ASTM Standards:Test MethodsD746,D945,D1053,D1229,D1329,D1415,D2136,D2137,D2240,D2632,Practice D832,and Specification E197.4.General Equipment Requirements44.1 The low-temperature cabinet may be refrigeratedmechanically,or by dry ice or liquid nitrogen,either directly
12、 orindirectly.4.1.1 The heat-transfer medium in the test chamber shouldbe air or air mixed with carbon dioxide or nitrogen,unless a1This practice is under the jurisdiction ofASTM Committee D11 on Rubber andRubber-like Materials and is the direct responsibility of Subcommittee D11.10 onPhysical Testi
13、ng.Current edition approved June 1,2018.Published August 2018.Originallyapproved in 1979.Last previous edition approved in 2012 as D3847 01(2012).DOI:10.1520/D3847-01R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual B
14、ook of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4For more detailed information,see Specification E197.Copyright ASTM International,100 Barr Harbor Drive,PO Box
15、C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the Wor
16、ld Trade Organization Technical Barriers to Trade(TBT)Committee.1 liquid medium is specified.Although liquids cool the speci-mens faster than gases,they are more likely to cause propertychanges in addition to those caused by temperature change.Water,ethyl alcohol,and ethylene glycol are usually acceptablefor immersion times that are kept to the minimum for therequired tests.4.1.2 The temperature variation within 250 mm of the testspecimen shall be within 61C of the specified testing tem-perature
