ASTM_D_612_-_88_2017.pdf

Designation:D61288(Reapproved 2017)Standard Test Method forCarbonizable Substances in Paraffin Wax1This standard is issued under the fixed designation D612;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers determination of carbonizablesubstances in paraffin wax.The test method is applicable toparaffin wax for pharmaceutical use,as defined by the U.S.National Formulary,with a melting point as determined inaccordance with Test Method D87,between 117 F and 149 F(47 C and 65 C).1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific warningstatements are given in Annex A1.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles 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:2D87 Test Method for Melting Point of Petroleum Wax(Cooling Curve)D1193 Specification for Reagent Water3.Summary of Test Method3.1 Five millilitres of melted wax are treated with 5 mL ofconcentrated,nitrogen-free sulfuric acid at 158 F(70 C).Thecolor of the acid layer is compared with that of a colorimetricreference standard.If the color is not darker than the standard,the wax is reported as passing the test.4.Significance and Use4.1 This test method is a means for ascertaining whetherpharmaceutical paraffin wax conforms to the standards forquality prescribed by the U.S.National Formulary.5.Apparatus5.1 Test Tube,as shown in Fig.1,of heat-resistant glass(seeNote 1)fitted with a well-ground glass stopper,the stopper andthe tube bearing identical and indestructible numbers.The tubeshall be 140 mm 6 2 mm in length and between 14.5 mm and15.0 mm in outside diameter,and shall be calibrated at the5 mL 6 0.2 mL and 10 mL 6 0.2 mL liquid levels.Thecapacity of the tube with stopper inserted shall be between13.6 mL and 15.6 mL.A rolled edge may be provided forsuspending the tube on the cover of the water bath.NOTE1Borosilicate glass has been found satisfactory for this pur-pose.5.2 Water Bath,suitable for immersing the test tube abovethe 10 mL line and equipped to maintain a temperature of158 F 6 1.0 F(70 C 6 0.5 C).The bath shall be providedwith a cover of any suitable material,with holes approximately16 mm in diameter through which the test tubes may besuspended.5.3 Color Comparator,of a suitable type for observing thecolor of the acid layer in comparison with the referencestandard color solution.The size and shape of the comparatorare optional,but the size and shape of the apertures shallconform to the dimensions prescribed in Fig.1.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended that1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.10.0A on Physical/Chemical Properties.Current edition approved June 1,2017.Published July 2017.Originally approvedin 1941.Last previous edition approved in 2012 as D612 88(2012).DOI:10.1520/D0612-88R17.2For 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 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 World Trade Organization Technical Barriers to Trade(TBT)Committee.1 all reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.3Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2