ASTM_D_6166_-_12_2016.pdf

Designation:D616612(Reapproved 2016)Standard Test Method forColor of Pine Chemicals and Related Products(InstrumentalDetermination of Gardner Color)1This standard is issued under the fixed designation D6166;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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 test method covers the quantitative determinationof the color of clear,yellow/brown,liquid materials using colormeasuring instruments.The results may be invalid if othermaterials are used.The test uses the Gardner color scaledescribed in Test Method D1544.This test method applies topine chemical products including tall oil,tall oil fatty acids,rosin,and related products.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,problems associated with its use.It isthe responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1544 Test Method for Color of Transparent Liquids(Gard-ner Color Scale)E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE308 Practice for Computing the Colors of Objects by Usingthe CIE SystemE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 The color of a liquid sample is measured using aninstrument capable of measuring transmitted color and report-ing in Gardner colors or in a color system that can be convertedto Gardner colors.4.Significance and Use4.1 This test method provides a more precise way ofmeasuring Gardner color than described in Test MethodD1544.It is applicable to pine chemical products having colorsfrom Gardner 1 to Gardner 18.The Gardner scale is notapplicable to materials with colors lighter than 1 or darker than18.5.Apparatus5.1 An instrument capable of measuring transmitted colorand reporting the results in the Gardner color scale described inTest Method D1544.If such an instrument is not available,onemay be used which is capable of measuring transmitted colorand reporting in tristimulus values or chromaticity coordinatesusing standard illuminant C and the 2 observer,described inPractice E308.5.2 Glass Cuvets,10mm path length,unless a differentpath length is specified by the manufacturer,or5.3 Glass Tubes,clear.Standard Gardner tubes,as describedin Test Method D1544,or other glass tubes designed for aspecific instrument may be used.Gardner tubes may provideless accuracy than glass cuvets and should be used only whena decrease in accuracy is acceptable.Glass cuvets should beused for referee situations.6.Calibration and Standardization6.1 Calibrate the instrument following the manufacturersrecommendations.6.1.1 Test sample preparation for rosin and rosin deriva-tives.6.1.1.1 As most rosins and rosin derivatives are solids it isnecessary to introduce a molten sample into the tube or cuvet.6.1.1.2 If the sample is available in molten form the testsample should be poured into the cuvet or tube and the colormeasured while the rosin is still molten.6.1.1.3 If the sample is in solid form it has to be melted inorder to be introduced into the tube or cuvet.The sample to betested shall consist of freshly broken lumps and free of dust andfinely divided material.Select a quantity at least twice thatnecessary required to fill the test tubes or cuvets and melt it ina clean container using an oven,hot plate,heat gun,sand bathor oil bath taking care to avoid overheating.Stir slowly1This test method is under the jurisdiction of Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.34 on Pine Chemicals and Hydrocarbon Resins.Current edition approved Dec.1,2016.Published December 2016.Originallyapproved in 1997.Last previous edition approved in 2012 as D6166 12.DOI:10.1520/D6166-12R16.2For 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 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 avoiding the formation of bubbles.Melt the sample completely,but do not heat it above the temperature necessary for thesample to pour readily.The time from the beginning of heatingto the pouring of the sample should not exceed 15 min.Pourthe molten test sample into the cuvet or tube and measure thecolor while the rosin is still molten.7.Procedure7.1 Taking care not to touch the measurement area of thesample cel