1、Designation: D 6694 07Standard Specification forLiquid-Applied Silicone Coating Used in Spray PolyurethaneFoam Roofing1This standard is issued under the fixed designation D 6694; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、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 liquid-applied solvent dis-persed elastomeric coating used as a roofing membrane
3、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 6.1.4 SI units are u
4、sed throughout this document. Inch-poundunits are in parentheses.1.5 This standard may involve hazardous materials, opera-tions, 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 t
5、oestablish appropriate safety and health practices and deter-mine the applicability of regulatory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2C 794 Test Method for Adhesion-in-Peel of ElastomericJoint SealantsD16 Terminology for Paint, Related Coatings, Materials,and Applica
6、tionsD 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 522 Test Methods for Mandrel Bend Test of AttachedOrganic CoatingsD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 903 Test Method for Peel or Stripping Strength of A
7、dhe-sive BondsD 1079 Terminology Relating to Roofing and Waterproof-ingD 1644 Test Methods for Nonvolatile Content of VarnishesD 2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational (Brookfield type) Vis-cometerD 2370 Test Method for Tensile Properties of OrganicCoat
8、ingsD 2697 Test Method for Volume Nonvolatile Matter inClear or Pigmented CoatingsE 96/E 96M Test Methods for Water Vapor Transmission ofMaterialsG 151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices that Use Laboratory Light SourcesG 154 Practice for Operating Fluorescent L
9、ight Apparatusfor UV Exposure of Nonmetallic Materials3. Terminology3.1 Definitions in Terminologies D16 and D 1079 shallapply to this specification.4. Materials and Manufacture4.1 CompositionThe product, as manufactured, shall be inliquid form for application to SPF surfaces by brushing,squeegeeing
10、, 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. Liquid and Physical Properties5.1 Although the product is s
11、upplied 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 property requirements in Table 1.5.3 Cured Film Physi
12、cal 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 D 2370, 8.2.2) to give a total dry film1This specification is under the jurisdicti
13、on of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.06on Spray Polyurethane Foam Roof Systems.Current edition approved May 1, 2007. Published May 2007. Originallyapproved in 2001. Last previous edition approved in 2001 as D 6694 01.2For reference
14、d 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Con
15、shohocken, PA 19428-2959, United States.thickness 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 12 h. The film shall be removedfrom the release paper and turned over after the first 168 h toallow for complete dr
16、ying.6. Test Methods6.1 Viscosity (Test Methods D 2196):6.1.1 Viscometer: Brookfield LVT viscometer #4 spindle, 6rpm.6.2 Elongation and Tensile Strength (Test Method D 2370):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
17、(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./min)Gage length 25 mm (1.0 in.)6.3 Accelerated Weathering Method (Practices G 151,G 154):Cycle used 4-h UV, 4-h condensationTemperature 60C UV, 50C condensationDuration (minimum) 500
18、0 hLamp UVA 3406.4 Permeance Method (Test Method E 96, ProcedureB)A 0.5-mm (20 mils) 6 10 % film shall be used.6.4.1 Test conditions: 23 6 2C (73.4 6 3.6F)6.4.2 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
19、Specified Substrate Method (Test MethodsC 794 or D 903):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 Methods C 794 and D 903) embedded between the coatsto give a total dry film thi
20、ckness of 0.5 mm (20 mils) 610 %.The panels are allowed to dry for 336 6 12hat236 2C (73.46 3.6F) 50 6 10 % relative humidity before testing for wetadhesion. If a primer is specified, it shall be applied per themanufacturers or suppliers direction.6.6 Tear Resistance Method (Test Method D 624):6.6.1
21、 Die C.6.7 Low-Temperature Flexibility Method (Test MethodD 522):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 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
22、 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. Inspecti
23、on8.1 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 and r
24、esubmit 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 polyurethanefoamTABLE 1
25、 Liquid Property RequirementsPhysical Properties ASTM Standard RequirementsViscosity D 2196 3500 to 50 000 CPSVolume solids D 2697 57 % minWeight solids D 1644 As listed by manufacturerTABLE 2 Film Physical Property Requirements for CuredSilicone Coating for Use on Spray Polyurethane FoamPhysical Pr
26、operty ASTM Standard RequirementInitial percent elongation(break)D 2370 min 100 %Initial tensile strength(maximum stress)D 2370 min 1.03 MPa(150 psi)Final percent elongation(break) after acceleratedweathering after 1000 hD 412 min 100 %Permeance E 96Procedure Bmin 14.3 3 10-8g/Pasm2(2.5 U.S. Perms)A
27、ccelerated weathering5000 hG 151G 154No cracking or checking;maintain at least 50 %of initial elongationAdhesion to SPF C 794D 903Min 350 N/m(2.0 pli) wetTear resistance D 624 Min 3.5 kN.m(20 lb ft/in.)Low-temperatureflexibilityD 522 Min pass 1.27 cm(12 in.) mandrel26C (15F)D6694072ASTM Internationa
28、l 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, are entirely their o
29、wn 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 standardsand should be a
30、ddressed 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 Committee on Standards,
31、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).D6694073
