ASTM_D_6356_-_D_6356M_-_98_2011e1.pdf

Designation:D6356/D6356M98(Reapproved 2011)1Standard Test Method forHydrogen Gas Generation of Aluminum Emulsified AsphaltUsed as a Protective Coating for Roofing1This standard is issued under the fixed designation D6356/D6356M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially revised in June 2011.1.Scope1.1 This test method covers a hydrogen gas and stability testfor aluminum emulsified asphalt coatings.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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.2.Referenced Documents2.1 ASTM Standards:2D1079 Terminology Relating to Roofing and WaterproofingD2939 Test Methods for Emulsified Bitumens Used asProtective Coatings(Withdrawn 2012)3E1 Specification for ASTM Liquid-in-Glass Thermometers3.Summary of Test Method3.1 A 200 g sample of water based aluminized coating isheated to 51.7 6 1C 125 6 2F in an Erlenmeyer flask andthe volume in millilitres of hydrogen gas evolved is measured.The test is conducted for one week(168 h)with a reading takenevery 24 h.The test room is to be maintained at 73.4 6 3.6Fin order to standardize gas collection temperature in the buretterecepticle.4.Significance and Use4.1 This procedure measures the amount of hydrogen gasgeneration potential of aluminized emulsion roof coating.There is the possibility of water reacting with aluminumpigment to generate hydrogen gas.This situation is to beavoided,so this test was designed to evaluate coating formu-lations and assess the propensity to gassing.5.Apparatus and Materials5.1 The assembly of the hydrogen gas generation testapparatus is illustrated in Fig.1.Details of the component partare as follows:5.1.1 Wide Mouth Glass Erlenmeyer Flask,250-mL capac-ity.5.1.2 Beaker,glass,250-mL.5.1.3 Burette,standard glass 100-mL graduated with glassstopcock and 0.2 mL divisions.5.1.4 Condenser,glass jacketed,having the dimensionsshown in Fig.2.5.1.5 Glass Tubing,standard glass 6.35 mm 14in.insidediameter 7.94 mm 516in.outside diameter and 127 mm 5in.length for forming the J tube.5.1.6 Tubing,pure latex amber rubber tubing,6.35 mm 14in.5.1.7 Neoprene Rubber Stopper,No.8 with one hole(pre-ferred connection for glass condenser to 250-mL Erlenmeyerflask).5.1.8 Oil or Water BathConstant temperature immersioncirculating bath capable of temperature control.5.1.9 OilCommercially available mineral oil or suitableheat transfer fluid.5.1.10 ThermometerASTM thermometer having a rangefrom 2 to+80C 30 to 180F and conforming to therequirements for thermometer 15C or 15F as prescribed inSpecification E1.1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.09 onBituminous Emulsions.Current edition approved May 1,2011.Published June 2011.Originallyapproved in 1998.Last previous edition approved in 2004 as D6356 98(2004).DOI:10.1520/D6356_D6356M-98R11E01.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Sampling6.1 Sample the material in accordance with Test MethodsD2939.7.Procedure7.1 Weigh 200 g of the sample directly in the 250-mLErlenmeyer flask ensuring that none coats the neck where thestopper is placed.7.2 Insert the filled flask into the oil or water bath(tempera-ture controlled to 51.7 6 1C 125 6 2F)and connect theglass condenser-stopper into the neck of the flask.Flask shouldbe supported internally via flask holder or externally with asuitable clamping device.7.3 Fill the 250-mL beaker with water and insert the100-mL burette and J-tube into the water.Avoid the introduc-tion of water into the J-tube.7.4 Draw the water level to the 100-mL mark on the buretteand close the stopcock.7.5 Record the time as the start of the induction period.7.6 After a 1 h induction period,record the time and thewater level point on the burette.The latter figure is the zeropoint.Do not include the one hour induction