1、Designation: D6694/D6694M 08 (Reapproved 2013)1Standard 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 ado
2、ption 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 December 2013.1. Scope1.1 This
3、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 foll
4、owing 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
5、 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 responsibilit
6、y 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
7、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 o
8、f VarnishesD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational (Brookfield type)ViscometerD2370 Test Method for Tensile Properties of Organic Coat-ingsD2697 Test Method for Volume Nonvolatile Matter in Clearor Pigmented CoatingsD4798 Practice for Accelerated Weathe
9、ring Test Conditionsand Procedures for Bituminous Materials (Xenon-ArcMethod)E96/E96M Test Methods for Water Vapor Transmission ofMaterials3. Terminology3.1 Definitions in Terminologies D16 and D1079 shallapply to this specification.4. Materials and Manufacture4.1 CompositionThe product, as manufact
10、ured, 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 requir
11、ed 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 liqui
12、d 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-h1This specification is under the jurisdiction of ASTM Committee D08 onRoofing
13、and Waterproofing and is the direct responsibility of Subcommittee D08.06on Spray Polyurethane Foam Roof Systems.Current edition approved March 1, 2008. Published December 2013. Originallyapproved in 2001. Last previous edition approved in 2008 as D6694 08. DOI:10.1520/D6694_D6694M-08R13.2For refere
14、nced 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 C
15、onshohocken, PA 19428-2959. United States1drying 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 allowedto thoroughly dry at 23 6 2C 73.4 6 3.6F and 50 6 10 %relative humidity for 336 6
16、 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 Viscometer: Brookfield LVT viscometer #4 spindle, 6rpm.6.2 Elongation and Tensile Strength (Test Method D2370):6.2.1 Test m
17、ethods: 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 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
18、 employed AUninsulated black panel temperature 63 3CFilter DaylightRadiant exposure (minimum) 6300 KJ/(m2 nm) at 340nm756 MJ/m2at 300 to 400nmNOTE 1In Practice D4798, the water temperature used for thespecimen spray during exposure to light is specified as 7.2 6 3C 45 65F to provide a thermal shock
19、to the specimens. If thermal shock is notrequired for D6694 specimens, the water temperature can be 21 6 5C 706 9 F, the typical temperature of water used for specimen spray.However, if ambient temperature is low and a holding tank is not used tostore purified water, the temperature of water can be
20、below the typicalrange.NOTE 2Based 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 6.3 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
21、.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 is 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
22、 brush applying two coatsto the specified substrate with the cloth strip (as described inTest Method D903) embedded between the coats 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 3.6F 506 10 % relative humidity before testing fo
23、r wet adhesion. If aprimer is specified, it shall be applied per the manufacturers orsuppliers direction.6.6 Tear Resistance Method (Test Method 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
24、 of 0.35 mm 14 mil 6 10 % and allow todry 72 h at 23 6 2C 73.4 6 3.6F and 50 6 10 % relativehumidity followed by 120 h at 50C before testing.7. Product Marking7.1 Shipping containers shall be marked with the name ofthe material, the stock number, lot number, ASTM designationnumber and year of issue,
25、 quantity therein, shelf-life date, andthe name of the manufacturer or supplier, unless otherwiseagreed upon between supplier and purchaser.8. Inspection8.1 Inspection of the material shall be as agreed upon byinvolved parties.9. Rejection and Resubmittal9.1 Failure to conform to any one of the requ
26、irementsprescribed 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.10. Precision and Bias10.1 The precision statements for t
27、he test methods includedin this specification are under development.11. Keywords11.1 elastomeric coating; roof; silicone; spray polyurethanefoamTABLE 1 Liquid Property RequirementsPhysicalPropertiesASTM Standard RequirementsViscosity D2196 3500 to 50 000 CPSVolume solids D2697 57 % minWeight solids
28、D1644 As listed by manufacturerTABLE 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 percen
29、t elongation(break) after 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
30、 3.5 kN.m20 lb ft/in.Low-temperatureflexibilityD522 Min pass 1.27 cm12 in. mandrel26C 15FD6694/D6694M 08 (2013)12ASTM 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 advi
31、sed 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 subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either
32、reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand 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
33、 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 standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individ
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