1、Designation: D2227 96 (Reapproved 2015)Standard Specification forNatural Rubber (NR) Technical Grades1This standard is issued under the fixed designation D2227; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. 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 U.S. Department of Defense.1. Scope1.1 This specification covers minimum physical
3、 and chemi-cal quality requirements or specifications for five grades of rawnatural rubber.2. Referenced Documents2.1 ASTM Standards:2D1278 Test Methods for Rubber from Natural SourcesChemical AnalysisD1485 Practice for Rubber from Natural SourcesSampling and Sample PreparationD1646 Test Methods for
4、 RubberViscosity, StressRelaxation, and Pre-Vulcanization Characteristics(Mooney Viscometer)D3157 Test Method for Rubber from Natural SourcesColorD3194 Test Method for Rubber From Natural SourcesPlasticity Retention Index (PRI)D3533 Test Method for RubberNitrogen Content (With-drawn 2006)33. Detaile
5、d Requirements for Grades3.1 The rubber shall conform to the requirements in Table 1.3.2 Any rubber not meeting all the requirements for one ofthe five grades in Table 1 cannot be considered a technicallygraded rubber.4. Significance and Use4.1 The general end-use quality of manufactured rubberprodu
6、cts depends on the physical and chemical properties ofthe rubber.5. Classification5.1 TypesTable 1 covers the physical and chemical re-quirements for five grades of natural rubber: Grades L, CV, 5,10, and 20.6. Sampling6.1 The sampling and sample preparation shall be in accor-dance with Practice D14
7、85.7. Test Methods7.1 Determine the properties enumerated in this specifica-tion in accordance with Test Methods D1278, D3533, D3194,D3157, and D1646.8. Keywords8.1 natural rubber (NR); technical grade1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct respo
8、nsibility of Subcommittee D11.22 on Natural Rubber.Current edition approved Sept. 1, 2015. Published December 2015. Originallyapproved in 1963. Last previous edition approved in 2011 as D2227 96 (2011).DOI: 10.1520/D2227-96R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orc
9、ontact ASTM Customer Service at serviceastm.org. For Annual Book 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.Copyright ASTM International, 100 Barr Harbor Driv
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15、ve, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Specifications For Technically Graded Natural RubberPropertyRubber GradeAGradeLGradeCVBGrade5Grade10Grade20Dirt, retained on 45m sieve, % max0.050 0.050 0.050 0.100 0.200Ash, % max 0.60 0.60 0.60 0.75 1.00Volatile matter, % max 0.80 0.80 0.80 0.80
16、 0.80Nitrogen, % max 0.60 0.60 0.60 0.60 0.60Initial plasticity, min 30 . 30 30 30Plasticity retentionindex, min60 60 60 50 40Color index, max 6.0 . . . .Mooney viscosity . 605 . . .ASkim rubber is not permitted in any grade, and Grades L, CV, and 5 must beproduced from intentionally coagulated latex.BOther Mooney ranges of Grade CV are available, CV- 505andCV-705.CVwithout suffix is the 605asshown in the table.D2227 96 (2015)2
