1、Designation:F50208(Reapproved 2013)Standard Test Method forEffects of Cleaning and Chemical Maintenance Materials onPainted Aircraft Surfaces1This standard is issued under the fixed designation F502;the number immediately following the designation indicates the year of originaladoption or,in the cas
2、e of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test meth
3、od covers determination of the effects ofcleaning solutions and liquid cleaner concentrates on paintedaircraft surfaces(Note 1).Streaking,discoloration,and blister-ing may be determined visually.Softening is determined witha series of specially prepared pencils wherein determination ofthe softest pe
4、ncil to rupture the paint film is made.NOTE1This test method is applicable to any paint film that is exposedto cleaning materials.MIL-PRF-85285 has been selected as a basicexample.When other paint finishes are used,refer to the applicablematerial specification for panel preparation and system curing
5、 prior totesting.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concer
6、ns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D329 Specification for AcetoneD1193 Specifica
7、tion for Reagent Water2.2 Military Standards:3MIL-PRF-85285 Coating:Polyurethane,Aircraft and Sup-port EquipmentA-A-58054 Abrasive Mats,Non-Woven Non-MetallicMIL-PRF-23377 Primer Coatings:Epoxy,High SolidsMIL-DTL-81706 Chemical Conversion Materials for Coat-ing Aluminum and Aluminum Alloys2.3 Federa
8、l Standards:3FED-STD-595 Colors Used in Government Procurement2.4 Industry Standards:4SAE-AMS-QQ-A-250/13 Aluminum Alloy Alclad 7075,Plate and Sheet3.Materials3.1 Drawing Pencils(Note 2)6B,5B,4B,3B,2B,B,HB,F,H,2H,4H,5H,and 6H.3.2 Fine Sand Paper,180 to 320 grit.3.3 Abrasive Mats,A-A-58054,aluminum o
9、xide,fine orvery fine.3.4 Acetone,in accordance with Specification D329.3.5 MIL-PRF-85285 Coating,polyurethane,Aircraft andSupport Equipment,FED-STD-595 Color No.17875,insigniawhite.3.6 MIL-PRF-23377 Primer Coating,epoxy polyamide,chemical-and solvent-resistant.3.7 Chemical Conversion Materials,MIL-
10、DTL-81706,Class 1A,for coating aluminum and aluminum alloys.3.8 Distilled or Deionized Water,in accordance with Speci-fication D1193,Type IV.NOTE2All pencils in a set must be from one manufacturer(forexample,Venus,Eagle,and so forth).4.Safety Precautions4.1 All safety regulations prescribed for spra
11、y application ofpolyurethane paints shall be strictly adhered to in the use of thistest method.4.2 The testing procedure shall be conducted in a well-ventilated area.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft and is the direct responsibility of Subcomm
12、ittee F07.07 onQualification Testing of Aircraft Cleaning Materials.Current edition approved Dec.1,2013.Published December 2013.Originallyapproved in 1977.Last previous edition approved in 2008 as F502 08.DOI:10.1520/F0502-08R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orco
13、ntact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Department of Defense Single Stock Point(DODSSP)WebServer at http:/dodssp.daps.dla.mil using ASSIST Quick Search.4Availab
14、le from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Test Specimens5.1 SAE-AMS-QQ-A-250/13 Aluminum Alloy Alclad7075-T6,Plate and Sheet.6.Test Solution
15、s6.1 Concentrated(as received,if a liquid).6.2 In use dilution,if diluent is water,see 3.8.7.Procedure7.1 Preparation of PencilsPrepare a set of drawing pen-cils for testing the painted panels by stripping the wood awayfrom the end approximately38in.(9.5 mm)without damagingthe lead(as shown in Fig.1
16、).Then square the tip of the lead byholding the pencil in a vertical position and moving the leadback and forth over a very fine(180-to 320-grit)sandpaper.Square the tip of the lead after each trial.7.2 Preparation of PanelsWipe 3-by 6-by 0.02-in.(76-by 152-by 0.5-mm)aluminum panels with acetone,dry andabrade lightly with a fine aluminum oxide mat.Rinse thesurface with distilled water and coat with a conversion coatingmaterial conforming to MIL-DTL-81706,Class 1A.Apply onecoat of MIL-PRF-23377 e
