1、Designation:D107615Standard Specification forRubberConcentrated,Ammonia Preserved,Creamed,andCentrifuged Natural Latex1This standard is issued under the fixed designation D1076;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 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.1.Scope1.1 This specification covers requirements for first gradeconcentrated natural rubber latex(see Table 1)of the followingcat
3、egories:Category 1Centrifuged Hevea natural latex preservedwith ammonia only or by formaldehyde followed by ammonia.Category 2Creamed Hevea natural latex preserved withammonia only or by formaldehyde followed by ammonia.Category 3Centrifuged Hevea natural latex preservedwith low ammonia with other n
4、ecessary preservatives.Category 4Centrifuged,or centrifuged and creamed,gu-ayule latex,or other natural rubber latex,containing less than200 g total protein per gram dry weight of latex,withammonia or other hydroxide,with other necessary preserva-tives and stabilizers.Category 5Centrifuged Hevea nat
5、ural latex treated withaluminum hydroxide or by other means,preserved with am-monia only or by formaldehyde followed by ammonia contain-ing less than 0.5%non-rubber content.1.2 This specification is not necessarily applicable to laticesprepared or preserved by other methods,and shall not beconstrued
6、 as limiting the desirability or usefulness of othercategories of latices.It does apply to natural latex sources otherthan Hevea brasiliensis but does not apply to compoundedlatex concentrates.1.3 The analytical procedures applicable to the specifica-tions are included and appear in the following or
7、der:SectionSampling6 and 7Total Solids8Dry Rubber Content9Protein Content10Total Alkalinity11Viscosity12Sludge Content13Coagulum Content14KOH Number15pH16Mechanical Stability17Copper and Manganese18Density19 31Volatile Fatty Acids32 36Boric Acid37Dry Films38Precision for All Test Methods391.4 The va
8、lues stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2D1278 Test Methods for Rubber from Natural SourcesChemical AnalysisD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubbe
9、r and Carbon Black ManufacturingIndustriesD5712 Test Method for Analysis of Aqueous ExtractableProtein in Latex,Natural Rubber,and Elastomeric Prod-ucts Using the Modified Lowry MethodD6499 Test Method for The Immunological Measurement ofAntigenic Protein in Natural Rubber and its ProductsE70 Test M
10、ethod for pH of Aqueous Solutions With theGlass Electrode3.General Specification Requirements3.1 In manufacturing,the material shall be processed inaccordance with the best commercial practice and shall be ofuniform composition.3.2 The material shall conform to the chemical and physicalrequirements
11、prescribed in Table 1.4.Significance and Use4.1 This specification denotes limits on the 4 categories oflatex as defined in the scope and defines the test methods to usefor the specified properties.These test methods may be used forproduction control or for referee purposes.1This specification is un
12、der the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.22 on Natural Rubber.Current edition approved Dec.15,2015.Published January 2016.Originallyapproved in 1949.Last previous edition approved in 2014 as D1076 14.DOI:10.1520/D1076-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,P
14、A 19428-2959.United States1 5.Inspection5.1 Inspection of the material shall be made as agreed uponbetween the purchaser and the seller as part of the purchasecontract.SAMPLING AND METHODS OF TESTING6.Preparations for Sampling6.1 Drums:6.1.1 Open-Head DrumsThe top shall be removed and thecontents st
15、irred with a high-speed stirrer for 10 min.6.1.2 Closed-Head DrumsIf the drum has at least 2%airspace,which is 20 mm(0.75 in.)on a standard drum,lay it onits side and roll for not less than 10 min.Up end the drum toits original position and allow to stand for 15 min and thenrepeat the rolling operat
16、ion for at least a further 10 min.In thecase of drums with less than 2%air space,all of the latex inthe closed-head drum shall be transferred to a larger vessel andmixed with a high-speed stirrer for 10 min.6.2 Tank CarsSamples shall be taken from the top andbottom of the car.If the total solids in the top and bottomsamples agree within 0.5%,the car shall be considereduniform enough for sampling.If top and bottom samples do notagree within 0.5%,the contents of the car shall be agitateduntil samp
