1、Designation: D6947/D6947M 07 (Reapproved 2013)1Standard 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 theye
2、ar 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 corrected in July 2013.1.
3、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-poun
4、d 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 p
5、ertains 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-bil
6、ity 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 Met
7、hods 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
8、 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 (B
9、rookfield type)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)G21 Practice for Determ
10、ining 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 f
11、oam (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 supp
12、liedas 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.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct respon
13、sibility of Subcommittee D08.06on Spray Polyurethane Foam Roof Systems.Current edition approved July 1, 2013. Published July 2013. Originally approvedin 2006. Last previous edition approved in 2013 as D6947 07 (2013). DOI:10.1520/D6947-07R13E01.2For referenced ASTM standards, visit the ASTM website,
14、 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 States15.
15、 Physical Properties5.1 The liquid coating shall comply with physical propertyrequirements in Table 1.5.2 The film shall comply with physical property require-ments in Table 2.6. Sample and Test Methods6.1 Viscosity (Test Methods D2196)Brookfield LVT Vis-cometer #4 Spindle, 6 RPM.6.2 Specimen Prepar
16、ation (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
17、 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 Strength (Test Method D2370):6.3.1 Test Conditions: 23 6 2C 73 6 3.6F at 50 6 10 %relative humidity and 18 6 2C 0 6 3.6F.6.3.2 Cut specimen measuri
18、ng 75 mm 3 in. long by 13 mm12 in. 6 10 % wide.6.3.3 Test type or functional equivalent:Cross head speed 0.4 mm/s 1.0 in./minGauge length 25 mm 1.0 in.6.4 Accelerated Weathering (Practice D4798):Cycle Employed AUninsulated Black Panel Temperature 63 3CFilter DaylightRadiant Exposure (Minimum) 1260 K
19、J/m2nm 340nm151.2 MJ/m2 300400nmNOTE 1Based on the irradiance level of 0.35 W/(m2 nm) at 340 nmspecified in Practice D4798, the exposure time required to accumulate theradiant energy specified in 6.4 is 1000 h.6.5 Permeance (Test Methods D1653, Procedure B)A 0.5mm 20 mils 6 10 % film shall be used.6
20、.5.1 Test Conditions: 23 6 2C 73.4 6 3.6F.6.5.2 Test is run in the inverted position with water incontact with the film.6.5.3 Value is reported in SI units.6.6 Water Absorption (Test Method D471)The test shall beconducted at 23 6 2C 73.4 6 3.6F using a 0.5 mm 20 mil6 10 % film immersed in distilled
21、water for a period of 168 64 h. At that time the weight is determined.6.7 Adhesion to Specified Substrate (Test Method D903):6.7.1 Crosshead speed 0.8 mm/s 2 in./min.6.7.2 Specimens are prepared by brush applying two coatsto the specified substrate with the cloth strip (as described inTest Method D9
22、03) embedded between the coats to give a totaldry film thickness of 0.5 mm 20 mils 6 10 %. The panels areallowed to cure for 336 6 12hat236 2C 73.4 6 3.6F 506 10 % relative humidity prior to testing for wet adhesion. Ifa primer is specified, it shall be applied per the manufacturersor suppliers dire
23、ction.6.7.3 Specimens shall be submerged for 168 6 6hintapwater at 23 6 2C 73.4 6 3.6F prior to testing for wetadhesion. Samples are tested immediately after soaking.6.8 Tear Resistance (Test Method D624)Die “C.”6.9 Low Temperature Flexibility (Test Method D522)Directly cast films to aluminum substr
24、ate to result in a dry filmthickness of 0.36 mm 6 10 % 14 mil 6 10 % and allow tocure 72 h at 23 6 2C 73.4 6 3.6F and 50 6 10 % relativehumidity followed by 120 h at 50C prior to testing.7. Performance Requirements7.1 Shipping containers shall be marked with the name ofthe material, the stock number
25、, lot number, ASTM designationnumber and year of issue, quantity therein, shelf-life date, andthe name of the manufacturer or supplier.8. Inspection8.1 Inspection requirements shall be determined by and asagreed upon between the purchaser and the supplier.9. Rejection and Resubmittal9.1 Failure to c
26、onform to any one of the requirementsprescribed in this specification shall constitute grounds forrejection. The seller shall have the right to reinspect therejected shipment and resubmit the lot after removal of thosepackages not conforming to the specified requirements.TABLE 1 Liquid Property Requ
27、irementsPhysicalPropertiesASTM RequirementsViscosity D562D219690 to 110 KU12 to 85 PasVolume Solids D2697 Greater than 65 %Weight Solids D1644 As listed by ManufacturerTABLE 2 Film Physical Property Requirements for PolyurethaneMoisture Cured Coating for Use on Sprayed Polyurethane FoamPhysicalPrope
28、rtyASTM RequirementInitial Percent Elongation(break)D2370 Minimum 350 %Initial Tensile Strength(maximum stress)D2370 Minimum 4.14 MPa 600psiFinal Percent Elongation(break) after acceleratedweathering after 1000 hD412 Minimum 350 %Permeance D1653Procedure BMaximum Permeance57 ng/(m2sPa)1 grain/ft2hin
29、.-HgWater Absorption (Mass) D471 Maximum 3 %Accelerated Weathering1000 hD4798 No cracking or checkingAdhesion D903 Minimum 350 N/m 2.0pliWetFungi Resistance G21 Zero RatingTear Resistance D624 Minimum 17.5 kNm100 pliLow TemperatureFlexibility, 12.5 mm 12 in.D522 Minimum pass mandrel-26C -15FD6947/D6
30、947M 07 (2013)1210. Precision and Bias10.1 The precision statements for the test methods includedin this specification are under development.11. Keywords11.1 elastomeric coating; moisture cured; polyurethanecoating; roof; spray polyurethane foamASTM International takes no position respecting the val
31、idity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is sub
32、ject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headqua
33、rters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standa
34、rd is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6947/D6947M 07 (2013)13
