1、Designation: D 6947 07Standard Specification forLiquid Applied Moisture Cured Polyurethane Coating Usedin Spray Polyurethane Foam Roofing System1This standard is issued under the fixed designation D 6947; the number immediately following the designation indicates the year oforiginal adoption or, in
2、the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers a single component, moisturecured, elastomeric urethane p
3、olymer 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 as thestandard. The values given in parentheses are for informationonly.1.4 The following pr
4、ecautionary 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 deter
5、mine the applica-bility of regulatory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint, Related Coatings, Materials,and ApplicationsD 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 471 Test Method for Rubber PropertyEffect o
6、f LiquidsD 522 Test Methods for Mandrel Bend Test of AttachedOrganic CoatingsD 562 Test Method for Consistency of Paints MeasuringKrebs Unit (KU) Viscosity Using a Stormer-Type Viscom-eterD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 903 Test Meth
7、od for Peel or Stripping Strength of Adhe-sive BondsD 1079 Terminology Relating to Roofing and Waterproof-ingD 1644 Test Methods for Nonvolatile Content of VarnishesD 1653 Test Methods for Water Vapor Transmission ofOrganic Coating FilmsD 2196 Test Methods for Rheological Properties of Non-Newtonian
8、 Materials by Rotational (Brookfield type) Vis-cometerD 2697 Test Method for Volume Nonvolatile Matter inClear or Pigmented CoatingsD 2370 Test Method for Tensile Properties of OrganicCoatingsD 4798 Practice for Accelerated Weathering Test Condi-tions and Procedures for Bituminous Materials (Xenon-A
9、rc Method)G21 Practice for Determining Resistance of SyntheticPolymeric Materials to Fungi3. Terminology3.1 For definitions of terms specific to this standard, refer toTerminologies D16and D 1079.4. 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, 2007. Published May 2007. Originallyapproved in 2006. Last previous edition approved in 2006 as D 6947 06.2For 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 t
14、o the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Sample and Test Methods6.1 Viscosity (Test Methods D 2196)Brookfield LVT Vis-cometer #4 Spindle, 6 RPM.6.2 Specimen Preparati
15、on (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
16、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 D 2370):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 m
17、easuring 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 D 4798):Cycle Employed AUninsulated Black Panel Temperature 63 6 3CFilter DaylightRadiant Exposure
18、 (Minimum) 1260 KJ/m2nm 340 nm151.2 MJ/m2 300400 nmNOTE 1Based on the irradiance level of 0.35 W/(m2 nm) at 340 nmspecified in Practice D 4798, the exposure time required to accumulate theradiant energy specified in 6.4 is 1000 h.6.5 Permeance (Test Methods D 1653, Procedure B)A0.5mm (20 mils) 6 10
19、% 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 D 471)The test shallbe conducted at 23 6 2C (73.4 6 3.6F) using a 0.5 mm (20mil) 6 10
20、% film immersed in distilled water for a period of168 6 4 h. At that time the weight is determined.6.7 Adhesion to Specified Substrate (Test Method D 903):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 stri
21、p (as described inTest Method D 903) embedded between the coats to give atotal dry film thickness of 0.5 mm (20 mils) 6 10 %. Thepanels are allowed to cure for 336 6 12hat236 2C (73.46 3.6F) 50 6 10 % relative humidity prior to testing for wetadhesion. If a primer is specified, it shall be applied p
22、er themanufacturers or 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 D 624)Die “C.”6.9 Low Temperature Flexibility (Test Method D 5
23、22)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 be marked w
24、ith 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 the supplier
25、.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 the specif
26、ied 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 RequirementsPhysicalProperties
27、ASTM RequirementsViscosity D 562D 219690 to 110 KU12 to 85 PasVolume Solids D 2697 Greater than 65 %Weight Solids D 1644 As listed by ManufacturerTABLE 2 Film Physical Property Requirements for PolyurethaneMoisture Cured Coating for Use on Sprayed Polyurethane FoamPhysicalPropertyASTM RequirementIni
28、tial Percent Elongation(break)D 2370 Minimum 350 %Initial Tensile Strength(maximum stress)D 2370 Minimum 4.14 MPa (600 psi)Final Percent Elongation(break) after acceleratedweathering after 1000 hD 412 Minimum 350 %Permeance D 1653Procedure BMaximum Permeance57 ng/m2sPa(1 grain/ft2hin.-Hg)Water Absor
29、ption (Mass) D 471 Maximum 3 %Accelerated Weathering1000 hD 4798 No cracking or checkingAdhesion D 903 Minimum 350 N/m (2.0 pli)WetFungi Resistance G21 Zero RatingTear Resistance D 624 Minimum 17.5 kNm(100 pli)Low TemperatureFlexibility, 12.5 mm (12 in.)D 522 Minimum pass mandrel-26C (-15F)D6947072A
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33、e 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).D6947073
