ASTM_D_6694_-_D_6694M_-_15.pdf

Designation:D6694/D6694M15Standard Specification forLiquid-Applied Silicone Coating Used in Spray PolyurethaneFoam Roofing Systems1This standard is issued under the fixed designation D6694/D6694M;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 liquid-applied solvent dis-persed elastomeric coating used as a roofing membrane forspray polyurethane foam(SPF)insulation whose principalpolymer in the dispersion contains more than 95%silicone.1.2 This specification does not provide guidance for appli-cation.1.3 The following precautionary caveat pertains only to thetest method portions,Sections 5 and 6.1.4 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.1.5 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD522 Test Methods for Mandrel Bend Test of AttachedOrganic CoatingsD624 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 VarnishesD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerD2370 Test Method for Tensile Properties of Organic Coat-ingsD2697 Test Method for Volume Nonvolatile Matter in Clearor Pigmented CoatingsD4798 Practice for Accelerated Weathering Test Conditionsand Procedures for Bituminous Materials(Xenon-ArcMethod)E96/E96M Test Methods for Water Vapor Transmission ofMaterialsE1953 Practice for Description of Thermal Analysis andRheology Apparatus3.Terminology3.1 Definitions in Terminologies D16 and D1079 shallapply to this specification.4.Materials and Manufacture4.1 CompositionThe product,as manufactured,shall be inliquid form for application to SPF surfaces by brushing,squeegeeing,rolling,or spraying.The product shall be com-posed of dispersion containing as the principal polymer morethan 95%silicone polymers to which various pigments andother additives have been added to give the required physicalproperties.5.Liquid and Physical Properties5.1 Although the product is supplied as a liquid,its perfor-mance is based on the functional properties of the curedmaterial in film form.The coating is formed into a film fullyadhered to the substrate.5.2 Liquid Property RequirementsThe liquid coating shallcomply with the property requirements in Table 1.5.3 Cured Film Physical Property Requirements:5.3.1 Specimen Preparation(Dry Time)(Table 2)Filmsare prepared by applying two coats,with a minimum of an 8-hdrying period between coats,to a polyethylene sheet substrate(from Test Method D2370,8.2.2)to give a total dry filmthickness of 0.50 6 0.5 mm 20 6 2 mils.The film is allowed1This 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 Nov.1,2015.Published November 2015.Originallyapproved in 2001.Last previous edition approved in 2013 as D6694/D6694M 08(2013)1.DOI:10.1520/D6694_D6694M-15.2For 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 to 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 h toallow for complete drying.6.Test Methods6.1 Viscosity(Test Methods D2196):6.1.1 Rotational Viscometer(see Practice E1953)with 60 to70 N-m torque full scale equipped with a spindle of the typeshown in Fig.1(with an active element nominally 3.2 mm indiameter and 31.0 mm in length)at rotational speed of 6 r/min.6.2 Elongation and Tensile Strength(Test Method D2370):6.2.1 Test methods:23 6 2C at 50 6 10%73 63.6F/relative humidity and 18 6 2C 0 6 2F.6.2.2 Cut specimen measuring 75 mm 3 in.l