1、Designation: D6694/D6694M 15Standard 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 ca
2、se 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
3、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
4、.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
5、 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 an
6、d 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 Convention
7、al 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 b
8、y 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
9、 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 f
10、or 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. Liqui
11、d 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
12、 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 tota
13、l 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. P
14、ublished 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 ASTMStandard
15、s 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 States1to thoroughly dry at 23 6 2C 73.4 6 3.6F and 50 6 10 %relative humidity for 336 6 12 h. The film sha
16、ll 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 acti
17、ve 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. long by 13 mm6 10 % 12
18、in. wide.6.2.3 Test Type or Functional Equivalent:Crosshead speed 25 mm/min 1.0 in./minGage length 25 mm 1.0 in.6.3 Accelerated Weathering (Practice D4798):Cycle employed AUninsulated black panel temperature 63 3CFilter DaylightRadiant exposure (minimum) 6300 KJ/(m2 nm) at 340nm756 MJ/m2at 300 to 40
19、0nmNOTE 1In Practice D4798, the water temperature used for thespecimen spray during exposure to light is specified as 7.2 6 3C45 6 5F to provide a thermal shock to the specimens. If thermal shockis not required for D6694/D6694M specimens, the water temperature canbe 21 6 5C 70 6 9 F, the typical tem
20、perature of water used forspecimen spray. However, if ambient temperature is low and a holdingtank is not used to store purified water, the temperature of water can bebelow the typical range.NOTE 2Based on the irradiance level of 0.35 W/(m2 nm) at 340 nmspecified in Practice D4798, the exposure time
21、 required to accumulate theradiant energy specified in 6.3 is 5000 h.6.4 Permeance Method (Test Method E96/E96M, ProcedureB)A 0.5-mm 20 mils 6 10 % film shall be used.6.4.1 Test conditions: 23 6 2C 73.4 6 3.6F6.4.2 Test is run in the inverted position with water incontact with the film.6.4.3 Value i
22、s reported in inch-pound and SI units.6.5 Adhesion to Specified Substrate Method (Test MethodD903):6.5.1 Crosshead speed 50 mm 2 in./min.6.5.2 Specimens are prepared by brush applying two coatsto the specified substrate with the cloth strip (as described inTest Method D903) embedded between the coat
23、s to give a totaldry film thickness of 0.5 mm 20 mils 610 %. The panels areallowed to dry for 336 6 12hat236 2C 73.4 6 3.6FTABLE 1 Liquid Property RequirementsPhysicalPropertiesASTM Standard RequirementsViscosity D2196 3500 to 50 000 CPSVolume solids D2697 57 % minWeight solids D1644 As listed by ma
24、nufacturerTABLE 2 Film Physical Property Requirements for Cured SiliconeCoating for Use on Spray Polyurethane FoamPhysical PropertyASTMStandardRequirementInitial percent elongation(break)D2370 min 100 %Initial tensile strength(maximum stress)D2370 min 1.03 MPa150 psiFinal percent elongation(break) a
25、fter 5000 haccelerated weatheringD2370 min 100 %Permeance E96/E96MProcedure Bmin 14.3 10-8g/Pasm22.5 U.S. PermsAccelerated weathering5000 hD4798 No cracking or checking;maintain at least 50 %of initial elongationAdhesion to SPF D903 Min 350 N/m2.0 pli wetTear resistance D624 Min 3.5 kN.m20 lb ft/in.
26、Low-temperatureflexibilityD522 Min pass 1.27 cm12 in. mandrel26C 15FFIG. 1 Spindle ConfigurationD6694/D6694M 15250 6 10 % relative humidity before testing for wet adhesion. Ifa primer is specified, it shall be applied per the manufacturersor suppliers direction.6.6 Tear Resistance Method (Test Metho
27、d D624):6.6.1 Die C.6.7 Low-Temperature Flexibility Method (Test MethodD522):6.7.1 Directly cast films to aluminum substrate to result in adry film thickness of 0.35 mm 14 mil 6 10 % and allow todry72hat236 2C 73.4 6 3.6F and 50 6 10 % relativehumidity followed by 120 h at 50C before testing.7. Prod
28、uct Marking7.1 Shipping containers shall be 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, unless otherwiseagreed upon between supplier and purchaser.8. Inspe
29、ction8.1 Inspection of the material shall be as agreed upon byinvolved parties.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 an
30、d resubmit the lot after removal of thosepackages not conforming to 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; roof; silicone; spray polyurethanefoamASTM
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