1、Designation:D777215(Reapproved 2019)Standard Test Method forCarbon Black Extractables Absorbance of CyclohexaneExtract1This standard is issued under the fixed designation D7772;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 method covers the determination of extinction(absorbance)of carbon black cyclohexane extract at 386 nmusing a UV s
3、pectrophotometer.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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 e
4、stablish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principle
5、s for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black Manufa
6、cturingIndustries3.Summary of Test Method3.1 Acarbon black sample is gently agitated in cyclohexaneat room temperature to remove any extractable material.Themixture is left standing in the dark for 24 h at room tempera-ture.The carbon black is separated from the cyclohexane byfiltration,with subsequ
7、ent determination of the extinction ofthe filtrate at 386 nm using a 50-mm cuvette.4.Significance and Use4.1 This procedure serves as a screening process for carbonblacks used in the manufacturing of products that are to comeinto contact with food.The cyclohexane extract absorbance at386 nm must be
8、less than 0.10 for a 50 mm cuvette in order tofulfill various regulatory requirements.5.Apparatus5.1 Spectrophotometer,20 nm maximum spectral bandpass,capable of measuring absorbance at 386 nm.5.2 Cuvettes,with an optical light path of 50 mm.5.3 Balance,analytical,sensitivity 0.01 g.5.4 Filter Paper
9、,with a particle retention in liquid less than2 m.5.5 Glass Filtering Funnels,75 mm diameter at top.5.6 Volumetric Flask,100 cm3.5.7 Lens Cleaning Tissue,lint free.5.8 Timer,with 1 s divisions.5.9 Oven,gravity-convection type,capable of temperatureregulation of 125 6 5C.5.10 Desiccator.5.11 As a goo
10、d laboratory practice,it could be suggested theuse of a Neutral Density Filter with a spectral absorbancecalibrated at 386 nm to ensure the spectrophotometer iscorrectly calibrated.6.Reagents and Materials6.1 Cyclohexane,analytical reagent grade.7.Hazards7.1 This test involves hazardous materials,op
11、erations andequipment.This procedure does not attempt to address thesafety problems associated with this test.A hazards reviewmust be conducted by all personnel performing the test.It is theresponsibility of the user to review all MSDS,manuals andhazards procedures and establish the appropriate safe
12、ty mea-sures.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.66 on Environment,Health,and Safety.Current edition approved Dec.1,2019.Published January 2020.Originallyapproved in 2011.Last previous edition approved
13、in 2015 as D7772 15.DOI:10.1520/D7772-15R19.2For referenced 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 Interna
14、tional,100 Barr Harbor Drive,PO Box 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 a
15、nd Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.8.Calibration,Standardization,and EnvironmentalConditions8.1 Standard Laboratory Test Conditions:8.1.1 Unless stated elsewhere,all testing,calibration andstandardization should be carried out in the a
16、mbient tempera-ture range of 23 6 3C.8.1.2 The date of calibration or testing should also berecorded with any relevant data.8.1.3 All calibration data should be recorded on a dedicatedfile.8.2 Instrument Set-Up Frequency Day of Test:8.2.1 Turn on the spectrophotometer and allow it to warmup for 30 min.8.2.2 Set the wavelength to 386 nm and zero the instrument.8.2.3 Place the Neutral Density Filter inside the samplecompartment of the instrument and verify the absorbance valueis within the absorba
