1、Designation: F502 08 (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 th
2、e case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () 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
3、This test method 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 determinati
4、on ofthe softest pencil to rupture the paint film is made.NOTE 1This 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 prepar
5、ation and system curing 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
6、 all of thesafety concerns, 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 Specificatio
7、n for AcetoneD1193 Specification 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 Alumi
8、num and Aluminum Alloys2.3 Federal 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
9、320 grit.3.3 Abrasive Mats, A-A-58054, aluminum oxide, 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- an
10、d solvent-resistant.3.7 Chemical Conversion Materials, MIL-DTL-81706,Class 1A, for coating aluminum and aluminum alloys.3.8 Distilled or Deionized Water, in accordance with Speci-fication D1193, Type IV.NOTE 2All pencils in a set must be from one manufacturer (forexample, Venus, Eagle, and so forth)
11、.4. Safety Precautions4.1 All safety regulations prescribed for spray 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
12、onAerospace and Aircraft and is the direct responsibility of Subcommittee 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/F0502-08R
13、13.2For 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.3Available from Department of Defense Single Stock Point (
14、DODSSP) WebServer at http:/dodssp.daps.dla.mil using ASSIST Quick Search.4Available 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 States15. Test Spe
15、cimens5.1 SAE-AMS-QQ-A-250/13 Aluminum Alloy Alclad7075-T6, Plate and Sheet.6. Test Solutions6.1 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 strippi
16、ng the wood awayfrom the end approximately38 in. (9.5 mm) without damagingthe lead (as shown in Fig. 1). 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 t
17、rial.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
18、MIL-PRF-23377 epoxy primer, 0.6 to 0.8 mil (0.015 to0.020 mm) and allow to dry1hatroom temperature. Apply amist coat of the designated polyurethane and allow to dry 30min at room temperature. Apply the finish coat in threeapplications of 0.4 to 0.6 mil (0.010 to 0.015 mm), allowing a1-h drying time
19、at room temperature between each coat. Allowthe painted panels to dry four days at room temperature; thenbake for 24 h at 180F (82C) or allow panels to air dry anadditional three to ten days at room temperature. No greaterthan one pencil hardness difference between coated panelsprepared from the sam
20、e batch of paint at the same time shall bepermitted.7.3 Procedure:7.3.1 Place the test panels in a horizontal position in an ovenmaintained at 100 6 5F (38 6 2C). Apply the test solutionto approximately one half the area of each panel and allow toremain on the panels for 30 min. Then remove the pane
21、ls fromthe oven and rinse with distilled or deionized water and allowto air dry for 24 h. Examine for streaking, discoloration, orblistering of the finish.7.3.2 Determine the hardness of the treated and untreatedareas in the following manner: Hold pencils of decreasinghardness by hand at a 45 angle
22、(see Fig. 1) and push across thepaint film with a firm uniform pressure until a pencil is foundthat will not cut the film but will leave a black mark on thesurface, whereas the next hardest pencil will cut through thefilm without leaving a black mark. The hardness number of thepencil that cuts the f
23、ilm shall express film hardness. Make atleast three determinations on both exposed and unexposedportions of the coated panel.8. Report8.1 The report shall include the following:8.1.1 The appearance of the panels after exposure,8.1.2 The pencil hardness required to rupture the paint filmon the unexpo
24、sed portion of the panel, and8.1.3 The pencil hardness required to rupture the paint filmon the exposed portion of the panel.9. Precision and Bias9.1 No statement as to precision and bias can be made asstandard materials do not exist for comparative tabulationpurposes.10. Keywords10.1 aircraft; effe
25、ct; painted surfacesASTM 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 advised that determination of the validity of any such patent rights, and the riskof infringement
26、 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 reapproved or withdrawn. Your comments are invited either for revision of this standard or fo
27、r 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 you feel that your comments have not received a fair hearing you shouldmake your views known
28、 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
29、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 1 Test for Hardness of Painted SurfaceF502 08 (2013)2
