1、Designation:D 6848 02Standard Specification forAluminum Pigmented Emulsified Asphalt Used as aProtective Coating for Roofing1This standard is issued under the fixed designation D 6848;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,t
2、he 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 aluminum pigmented emulsi-fied asphalt suitable for application as a protective coati
3、ng forbuilt-up roofs and other exposed surfaces by brush,roller,orspray application.The surfaces to which this product is appliedare expected to have positive drainage as the coating is notanticipated for use where ponding conditions exist.The prod-uct is suitable for use on sheet metal,and smooth o
4、r granulesurfaced emulsion,conventional BUR,and modified bitumensystems.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 The user is cautioned that aluminum pigmented emul-sified asphalt may generate a reaction resulting
5、in the evolutionof hydrogen gas.Use caution when opening containers.1.4 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 toes
6、tablish appropriate safety and health practices and deter-mine the applicability of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:B 209 Specification for Aluminum and Aluminum-AlloySheet and Plate2D 562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Visc
7、osity Using a Stormer-Type Viscom-eter3D 2824 Specification for Aluminum-Pigmented AsphaltRoof Coatings,Nonfibered,Asbestos Fibered,and FiberedWithout Asbestos4D 2939 Test Methods for Emulsified Bitumens Used asProtective Coatings4D 6356 Test Method for Hydrogen Gas Generation ofAluminum Emulsified
8、Asphalt Used as a Protective Coat-ing for RoofingG 154 Practice for Operating Fluorescent Light Apparatusfor UV Exposure of Nonmetallic Materials53.Classification3.1 Aluminum pigmented emulsified asphalt covered by thisspecification are of the general types such as:3.1.1 Type I Non-fibered,containin
9、g no fiber.3.1.2 Type II Fibered,containing asbestos fiber.3.1.3 Type III Fibered,containing no asbestos fiber.4.Physical Requirements4.1 UniformityAfter a thoroughly stirred sample hasstood for 72 h at room temperature 23.9 6 1.7C(75 6 3.0F)the aluminum emulsion shall be of smooth,uniform consis-te
10、ncy without separation of settlement in storage to the extentthat it cannot be readily dispersed by moderate stirring.4.2 ConsistencyThe aluminum emulsion shall be of suit-able consistency for application above freezing by brush,roller,or suitable spray equipment without thinning with wateror heatin
11、g,and shall bond to either damp or dry surfaces toproduce a film in which the aluminum pigment forms a brightreflective surface when applied according to manufacturersrecommendations.4.3 Application of the aluminum emulsion shall be between10 and 37.8C(50 and 100F)surface temperature.At tem-perature
12、s above 37.8C(100F),a fine water mist to aidcooling of the roof surface to be coated prior to application isrecommended.The amount of water applied to the surfaceshould be sufficient for dampening without any glisteningsurface water.4.4 The aluminum emulsion shall conform to the additionalrequiremen
13、ts prescribed in Tables 1 and 2.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.09on Bituminous Emulsions.Current edition approved Dec.10,2002.Published March 2003.2Annual Book of ASTM Standards,Vol
14、02.02.3Annual Book of ASTM Standards,Vol 06.01.4Annual Book of ASTM Standards,Vol 04.04.5Annual Book of ASTM Standards,Vol 14.04.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.5.Sampling5.1 Sample the material in accordance with Test Met
15、hodsD 2939.6.Test Methods6.1 ReflectanceSpecification D 2824,Section 8,(8.6).6.2 Drying TimeTest Methods D 2939,Section 13.6.3 Resistance to WaterTest Methods D 2939,Section 15,except use in 0.38 mm(0.015 in.)wet film thickness for TypeI,and 0.51 mm(0.020 in.)wet film thickness for Type II andType I
16、II coatings.6.4 Weight per U.S.gal,lbTest Methods D 2939,Section7.6.5 ConsistencyDetermine the consistency in accordancewith Test Method D 562,Procedure A and Procedure B.6.6 Residue by EvaporationDetermine residue by evapo-ration in accordance with Test Methods D 2939,Section 8.6.7 Water ContentDetermine water content in accordancewith Test Methods D 2939,Section 11.6.8 Hydrogen Gas GenerationDetermine gas generationin accordance with Test Method D 6356.6.9 Accelerated WeatheringPractice G 154.
