ASTM_D_6947_-_D_6947M_-_16.pdf

Designation:D6947/D6947M16Standard Specification forLiquid Applied Moisture Cured Polyurethane Coating Usedin Spray Polyurethane Foam Roofing System1This standard is issued under the fixed designation D6947/D6947M;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.1.Scope1.1 This specification covers a single component,moisturecured,elastomeric urethane polymer coating used as a protec-tive coating for spray polyurethane foam roofing systems.1.2 This specification does not provide guidance for appli-cation.1.3 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.1.4 The following precautionary caveat pertains only to thetest method portions,Sections 5 and 6.1.5 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 requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD522 Test Methods for Mandrel Bend Test of AttachedOrganic CoatingsD562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Viscosity Using a Stormer-Type Viscom-eterD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD903 Test Method for Peel or Stripping Strength of Adhe-sive BondsD1079 Terminology Relating to Roofing and WaterproofingD1644 Test Methods for Nonvolatile Content of VarnishesD1653 Test Methods for Water Vapor Transmission of Or-ganic Coating FilmsD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerD2697 Test Method for Volume Nonvolatile Matter in Clearor Pigmented CoatingsD2370 Test Method for Tensile Properties of Organic Coat-ingsD4798 Practice for Accelerated Weathering Test Conditionsand Procedures for Bituminous Materials(Xenon-ArcMethod)E1953 Practice for Description of Thermal Analysis andRheology ApparatusG21 Practice for Determining Resistance of Synthetic Poly-meric Materials to Fungi3.Terminology3.1 For definitions of terms specific to this standard,refer toTerminologies D16 and D1079.4.Materials and Manufacture4.1 CompositionThe product,as manufactured,shall be inliquid form for application to spray polyurethane foam(SPF)surfaces by brushing,rolling,or spraying.The product shall becomposed of a solvent-borne moisture curing urethane elasto-meric polymer,to which various pigments or other additiveshave been added to give the required physical properties.4.2 Physical PropertiesAlthough the product is suppliedas a liquid,its performance is based on the functional proper-ties of the dried material in film form.The coating is formedinto a film fully adhered to the substrate surface.5.Physical Properties5.1 The liquid coating shall comply with physical propertyrequirements in Table 1.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.06on Spray Polyurethane Foam Roof Systems.Current edition approved Jan.1,2016.Published January 2016.Originallyapproved in 2006.Last previous edition approved in 2013 as D6947/D6947M 07(2013)1.DOI:10.1520/D6947_D6947M-16.2For 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 5.2 The film shall comply with physical property require-ments in Table 2.6.Sample and Test Methods6.1 Viscosity(Test Methods D2196):6.1.1 A Rotational Viscometer(see Practice E1953)with 60to 70 Nm torque full scale equipped with a spindle with ashear rate of 1.2 to 1.3 s-1at 0.63 rad s-1(6 r/min).6.2 Specimen Preparation(Dry Time)Films are preparedby applying two coats,with a minimum of an 8-h drying periodbetween coats,to an FEB sheet substrate to give a total dry filmthickness of 0.50 6 0.5 mm 20 6 2 mils.The film is allowedto thoroughly dry at 23 6 2C 73.4 6 3.6F and 50 6 10%relative humidity for 336 6 12 h.The film shall be removedfrom the release paper and turned over after the first 168 6 12h to allow for complete curing.6.3 Elongation and Tensile Str