1、Designation: D6947 07 (Reapproved 2013)Standard Specification forLiquid Applied Moisture Cured Polyurethane Coating Usedin Spray Polyurethane Foam Roofing System1This standard is issued under the fixed designation D6947; the number immediately following the designation indicates the year oforiginal
2、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.1. Scope1.1 This specification covers a single component, moisturecured, elastom
3、eric 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 SI units are to be regarded asstandard. The values given in parentheses are for informationonly.1.4 The f
4、ollowing 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 practice
5、s 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 Propert
6、yEffect 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 Te
7、st 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-Newto
8、nian Materials by Rotational (Brookfield 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-Ar
9、cMethod)G21 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 appl
10、ication 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 Propert
11、iesAlthough 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 propertyrequireme
12、nts in Table 1.5.2 The film shall comply with physical property require-ments in Table 2.1This 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 appr
13、oved May 1, 2013. Published May 2013. Originallyapproved in 2006. Last previous edition approved in 2007 as D6947 07. DOI:10.1520/D6947-07R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards vol
14、ume 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 States16. Sample and Test Methods6.1 Viscosity (Test Methods D2196)Brookfield LVT Vis-cometer #4 Spindle, 6 RPM.
15、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 %rela
16、tive 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 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)
17、.6.3.2 Cut specimen measuring 75 mm (3 in.) long by 13 mm(12 in.) 6 10 % wide.6.3.3 Test type or functional equivalent:Cross head speed 0.4 mm/s (1.0 in./min)Gauge length 25 mm (1.0 in.)6.4 Accelerated Weathering (Practice D4798):Cycle Employed AUninsulated Black Panel Temperature 63 3CFilter Daylig
18、htRadiant Exposure (Minimum) 1260 KJ/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
19、(20 mils) 6 10 % film shall be used.6.5.1 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、 (20 mil)6 10 % film immersed in distilled 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 t
21、he cloth strip (as described inTest Method D903) 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
22、be applied per the manufacturersor suppliers direction.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
23、 Method D522)Directly cast films to aluminum substrate 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 b
24、e marked with the name ofthe material, the stock number, 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 th
25、e supplier.9. Rejection and Resubmittal9.1 Failure to conform 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
26、the specified requirements.10. 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 foamTABLE 1 Liquid Property RequirementsPhysical
27、PropertiesASTM 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 FoamPhysicalPropertyASTM Requirem
28、entInitial Percent Elongation(break)D2370 Minimum 350 %Initial Tensile Strength(maximum stress)D2370 Minimum 4.14 MPa (600psi)Final Percent Elongation(break) after acceleratedweathering after 1000 hD412 Minimum 350 %Permeance D1653Procedure BMaximum Permeance57 ng/m2sPa(1 grain/ft2hin.-Hg)Water Abso
29、rption (Mass) D471 Maximum 3 %Accelerated Weathering1000 hD4798 No cracking or checkingAdhesion D903 Minimum 350 N/m (2.0pli)WetFungi Resistance G21 Zero RatingTear Resistance D624 Minimum 17.5 kNm(100 pli)Low TemperatureFlexibility, 12.5 mm (12 in.)D522 Minimum pass mandrel-26C (-15F)D6947 07 (2013
30、)2ASTM International takes no position respecting the validity 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, a
31、re entirely their own responsibility.This standard is subject 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 stand
32、ardsand should be addressed to ASTM International Headquarters. 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 Commi
33、ttee on Standards, at the address shown below.This standard 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 07 (2013)3
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