1、Designation: D 6694 08Standard Specification forLiquid-Applied Silicone Coating Used in Spray PolyurethaneFoam Roofing Systems1This 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 revisi
2、on, 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 liquid-applied solvent dis-persed elastomeric coating used as a roofing m
3、embrane 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 uni
4、ts are used 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 st
5、andard 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,and ApplicationsD 522 Test Methods for Mandrel Bend Test of AttachedOr
6、ganic CoatingsD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 903 Test Method 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 2196 Te
7、st Methods for Rheological Properties of Non-Newtonian Materials by Rotational (Brookfield type) Vis-cometerD 2370 Test Method for Tensile Properties of OrganicCoatingsD 2697 Test Method for Volume Nonvolatile Matter inClear or Pigmented CoatingsD 4798 Practice for Accelerated Weathering Test Condi-
8、tions and Procedures for Bituminous Materials (Xenon-Arc Method)E 96/E 96M Test Methods for Water Vapor Transmission ofMaterials3. Terminology3.1 Definitions in Terminologies D16 and D 1079 shallapply to this specification.4. Materials and Manufacture4.1 CompositionThe product, as manufactured, shal
9、l 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 required physica
10、lproperties.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 liquid coating
11、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-hdrying period between coats, to a polyethylene sheet substrate(from Test Method D 2370,
12、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 12 h. The film shall be removedfrom the release paper and turned over after the first 168 h toallow for complete drying.1Thi
13、s 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 March 1, 2008. Published April 2008. Originallyapproved in 2001. Last previous edition a
14、pproved in 2007 as D 6694 07.2For 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 to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 1
15、00 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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.
16、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./min)Gage length 25 mm (1.0 in.)6.3 Accelerated Weathering (Practice D 4798):Cycle employed AUninsulated
17、black panel temperature 63 6 3CFilter DaylightRadiant exposure (minimum) 6300 KJ/(m2 nm) at 340 nm756 MJ/m2at 300 to 400 nmNOTE 1In Practice D 4798, 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 to the specimens
18、. If thermal shock is notrequired for D 6694 specimens, the water temperature can be 21 6 5C(70 6 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 below the typ
19、icalrange.NOTE 2Based 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 6.3 is 5000 h.6.4 Permeance Method (Test Method E 96, ProcedureB)A 0.5-mm (20 mils) 6 10 % film shall be used.6.4.1 Test cond
20、itions: 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 Specified Substrate Method (Test MethodD 903):6.5.1 Crosshead speed 50 mm (2 in.)/min.6.5.2 Specimens are prepared by brush ap
21、plying two coatsto the specified substrate with the cloth strip (as described inTest Method D 903) embedded between the coats to give atotal dry film thickness of 0.5 mm (20 mils) 610 %. The panelsare allowed to dry for 336 6 12hat236 2C (73.4 6 3.6F)50 6 10 % relative humidity before testing for we
22、t adhesion. Ifa primer is specified, it shall be applied per the manufacturersor suppliers direction.6.6 Tear Resistance Method (Test Method D 624):6.6.1 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 o
23、f 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 issu
24、e, 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 re
25、quirementsprescribed 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
26、 the test methods includedin this specification are under development.11. Keywords11.1 elastomeric coating; roof; silicone; spray polyurethanefoamTABLE 1 Liquid Property RequirementsPhysical Properties ASTM Standard RequirementsViscosity D 2196 3500 to 50 000 CPSVolume solids D 2697 57 % minWeight s
27、olids D 1644 As listed by manufacturerTABLE 2 Film Physical Property Requirements for CuredSilicone Coating for Use on Spray Polyurethane FoamPhysical Property ASTM Standard RequirementInitial percent elongation(break)D 2370 min 100 %Initial tensile strength(maximum stress)D 2370 min 1.03 MPa(150 ps
28、i)Final percent elongation(break) after 5000 haccelerated weatheringD 2370 min 100 %Permeance E 96Procedure Bmin 14.3 3 10-8g/Pasm2(2.5 U.S. Perms)Accelerated weathering5000 hD 4798 No cracking or checking;maintain at least 50 %of initial elongationAdhesion to SPF D 903 Min 350 N/m(2.0 pli) wetTear
29、resistance D 624 Min 3.5 kN.m(20 lb ft/in.)Low-temperatureflexibilityD 522 Min pass 1.27 cm(12 in.) mandrel26C (15F)D6694082ASTM 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 exp
30、ressly advised 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 revis
31、ed, either 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
32、 attend. If 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. 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).D6694083
