1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Release/Revision1988-09-29 SM/EQ8559TP ReleasedWP 3948-a Page 1 of 8 ENAMEL, WATERBORNE METALLIC BASECOAT FOR ESK-M62J26-ABASECOAT/CLEARCOAT SYSTEMS, EXTERIOR1. SCOPEThe material defined by this specification is a
2、water-borne, metallicbasecoat, to be used after pre- drying with colourless clearcoat (e.g. SKM-32J9553-A).2. APPLICATIONThis specification was released originally for material with low solventemission used as topcoat colour for primed bodies and other exteriorcomponents.3. REQUIREMENTS3.1 STATISTIC
3、AL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q-101. A mutually acceptable Control Plan as describedtherein is required for material/source approval. Appropriatestatist ical tools must be used to analyze process/product data sothat variation in the final produ
4、ct is continuously reduced.3.2 COMPOSITION3.2.1 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infraredand/o r thermal analysis of material/parts supplied to thisspeci fication. The IR spectra and thermograms establishedfor initial approval sh all co
5、nstitute the reference standardand s hall be kept on file at the designated materiallaborat ory. All samples shall produce IR spectra andtherm ograms that correspond to the reference standard whentested under the same conditions.3.2.2 UV Spectroscopic AnalysisA UV spectroscopic anal ysis is to be ca
6、rried out on approvedinitial samples from th e FoMoCo Quality Control or Ford TestLaboratories. The resu lts are to be retained. Results fromUV sp ectroscopic analyses carried out for control purposesmus t correspond with the values obtained from the initialsample.ENGINEERING MATERIAL SPECIFICATIONE
7、SK-M62J26-AWP 3948-b Page 2 of 8 3.2.3 BinderSynthetic resin, water-borne3.2.4 Pigmentation Weather- and light-r esistant pigmentsNote:For critical colours (weather resistance) the us e of suitableadditives (e.g. UV-absorber and/or quencher) is permitted.3.2.5 ProductivityFor all initial sample and
8、batch submissions the density(FLTM EU-BI 2-2), the non-volatile content (FLTM EU-BI 2-1)and the volume solids (FLTM EU-BI 154-2) of the material assupplied must be quoted on the D520 report form.3.3 PHYSICAL PROPERTIES3.3.1 Non-volatile residue(FLTM EU-BI 2-1)In accordance with initial sample report
9、 +/- 1.5 %, min 17 %.3.3.2 Volume of non-volatile solids(FLTM BI 154-2)In accordance with initial sample report +/- 0.05 %.The percentage of organic solvent content has to be quoted inthe initial sample report.3.3.3 Supply ViscosityMaterial must be supplied at spray viscosity in production.Prior to
10、initial approv al a flow curve has to be establishedon Haake Roto-Viskosimeter RV 20/M5 under conditions asfollow:25 +/- 0.3 C,shear 4 minutes from 1/s to 500/sshear 2 minutes at 500/sshear 4 minutes from 500/s to 1/sThis diagram has to correspond to the reference standardestablished by Engineering
11、Materials Laboratory.3.3.4 Storage StabilityAfter 3 months storage at 23 +/- 2 C, the material assupplied must not gel, liver upon standing and must be freeof settling which cannot be dispersed by normal agitation.ENGINEERING MATERIAL SPECIFICATIONESK-M62J26-AWP 3948-b Page 3 of 8 3.3.5 Opacity of D
12、ry Film(FLTM EU-BI 58-1)Complete coverage of undercoat/substrate at a dry filmthickness of maximum 15 Microns.3.3.6 Flash-point(ASTM D 56)The flash-point determined by the supplier and quoted onInitial Sample Report must meet the safety regulationsrelev ant to the Assembly Plant and/or country where
13、 thematerial is in use.3.3.7 pH-ValueThe pH value must be determined by the supplier and must bequoted on Initial Sample Report.3.3.8 Hydrogen evolution 15 ml(FLTM BI . tbe), max3.4 PREPARATION OF TEST PANELS(FLTM EU-BI 3-2, method Bb)Substrate UMA 18005X standard panels or equivalent.3.4.1 Spray vi
14、scosity(FLTM EU-BI 11-1 - clearcoat only)3.4.1.1 Metallic Basecoat ESK-M62J26-AAs delivered by supplierNote:Application conditions for metallic basecoat ESK-M62J26-AAmbient temperature 22 +/- 3 CRelative humidity 60 +/- 5 %3.4.1.2 Acrylic ClearcoatSKM-32J9553-A, according to suppliers informa tion.3
15、.4.1.3 Two-pack clearcoatSKM-1J9554-A plus SKM-99J9608-AAs specified by supplierENGINEERING MATERIAL SPECIFICATIONESK-M62J26-AWP 3948-b Page 4 of 8 3.4.2 Dry Film ThicknessMetallic basecoat ESK-M62J26-A 15 +/- 5 micronsClearcoat 40 +/- 5 micronsTotal film thickness minimum 50 microns3.4.3 Flash-off
16、conditionsBetween application of metallic basecoat and the appropriateclearcoat: as specified by supplier, however, preferably 7minutes at 80 C metal temperature.3.4.4 Stoving ConditionsThe following stoving conditions are required for thefollowing tests:3.4.4.1 Standard Bake10 minutes at 130 C obje
17、ct temperature.# 3.5.1 Colour# 3.5.2 Gloss# 3.5.3 Heat Resistance# 3.6.2 Hardness# 3.6.3 Polishability# 3.7 Resistance properties# 3.8.1 Colour uniformity on repairpainting3.4.4.2 Standa rd Bake plus 10 minutes at 150 C (objecttemperature) is required for the following tests# 3.5.1 Colour# 3.5.3 Hea
18、t Resistance# 3.8.3.2 Adhesion to intermediate coats2 pack Repair painting (low bake)Note:Prior to exposure, th e long-term weathering panelsare treated over 1/3 of their surface with cuttingpas te Glasurit SL62-0101 or equivalent material.Th is is distributed 10 times in a lengthwisedir ection unde
19、r medium pressure using cottonwadding. The test panels are finally wiped usinga clean cloth.3.4.5 AgeingPanels are aged prior to testing for 72 hours at 23 +/- 2 Cor 16 hours at 45 +/- 2 C.In the case of differing test results, the results for 72hours at 23 +/- 2 C take precedence.ENGINEERING MATERI
20、AL SPECIFICATIONESK-M62J26-AWP 3948-b Page 5 of 8 3.5 APPEARANCE3.5.1 Colour(FLTM EU-BI 9-1)The colour must match the official colour panel (MAS-panel)which ever stoving schedule (# 3.4.4) is used.3.5.2 Gloss, minimum 85 %(FLTM BI 110-1, 20 deg glossmeter)This requirement applies only to standard ba
21、ke panels (#3.4.4.1).3.5.3 Heat ResistanceA decrease in gloss of maximum 4 units is permitted when thepaint film is stoved additionally according to # 3.4.4.2.3.5.4 General AppearanceThe paint coating must be capable to give after stoving asmoo th film with good flow and no cratering, no abnormalrou
22、ghness or excessive metallic mottling.It must be capable of b eing cleaned by normal procedures andhave excellent polishing properties.3.6 FILM PROPERTIESAll test values indicated herein are based on ma terial conditioned ina control led atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for n
23、ot less than 24 h prior to testing and tested under thesame conditions unless otherwise specified.3.6.1 Dry Film Thickness(FLTM EU-BI 17-1)Metallic basecoat + clearcoat minimum 50 microns (see 3.4.2).3.6.2 Hardness(FLTM EU-BI 12-1)Tukon 7.5 KHN minimumPanel stoving according to # 3.4.4.13.6.3 Polish
24、abilityHardness and polishability of the film should be such thatdust, overspray and other surface defects can be removed bysanding and polishing.After sanding with 600 paper, machine polish with petrol andan app roved polishing paste. No visible difference inappearance between the polished and unpo
25、lished f ilm should beapparent.ENGINEERING MATERIAL SPECIFICATIONESK-M62J26-AWP 3948-b Page 6 of 8 3.7 RESISTANCE PROPERTIES3.7.1 Chip Resistance(FLTM EU-BI 7-1)Maximum rating 13.7.2 Stone-chip resistance(FLTM EU-BI 57-2) Rating 1 maximum(FLTM EU-BI 57-4) Rating 4 maximumOnly chipping of the topcoat
26、 from the sprayed un dercoat is tobe rated.Report on chipping from the metal.3.7.3 Water resistance(FLTM EU-BI 4-1)The pain t film must withstand the 240 hour water-soak testwithout discolouration, blistering, peeling, dulling orserious roughening.3.7.4 Weathering resistanceExterior weathering(FLTM
27、EU-BI 60-1)Panels prepared according to # 3.4 are exposed at 5 degfacing south for 12 months in the Miami/Florida area.Only slight dulling colour change or fading must occur.After 12 months exposure no cracking, checking, rust-blistersor peel ing shall be visible. The panels must then show agloss of
28、 minimum 70 uni ts using a 20 deg glossmeter (FLTM BI110-1) and must be free from dirt and mildew. The paintsys tem on the weathered panel must withstand the adhesiontest FLTM BI 106-1 method C.Loss of adhesion of the clearcoat or of the total system isnot permitted.Until finally establish ed, the p
29、eriod of weathering exposureshoul d be carried out for information up to 5 years.Intermediate evaluations should be made every 12 months.3.7.5 Resistance to water-spotting and soap spotting(FLTM BI 113-1)3.7.5.1 Maximum water spotdiscolouration: 0.3 NBS units3.7.5.2 Maximum soap spotdiscolouration:
30、0.8 NBS unitsENGINEERING MATERIAL SPECIFICATIONESK-M62J26-AWP 3948-b Page 7 of 8 3.7.6 Resistance to Acid Spotting(FLTM EU-BI 13-2)Maximum acid spot discolouration 0.8 NBS units3.7.7 Cold Checking ResistanceThe topcoat when applied and tested according to FLTM EU-BI7-2 shall withstand a m inimum of
31、10 cold test cycles withoutcracking or noticeable dulling.3.8 REPAIR PAINTING3.8.1 Repair Colour Match(FLTM EU-BI 15-1)The paint film shall show satisfactorily colour match afterrecoating and rebaking at standard bake accordin g to FLTM EU-BI 15-1.3.8.2 Intercoat Adhesion No loss of adhesion(EU BI 6
32、-2, after standard bake (3.4.4.1) and rebake(3.4.4.2)3.8.3 Repair Painting (Low bake)3.8.3.1 Panel preparationPanels prepared acc. 3.4.1.1 and 3.4.2.2 are drysanded with 400 grit paper. Spray solvent bas ecoatSM-32J110-B and catalyzed clearcoat SKM-32J9553-Aplus acid catalyst SM-99J9565-B. Bake for
33、10minutes at 100 C.The paint system with clearcoat shall showsatisfactory colour match and adhesion to the bakedfinish.The hardness of the clearcoat shall be minimum 6KHN (Tukon). Measurement after 168 hours storageat 23 +/- 2 C.3.8.3.2 Weathering ResistanceSimilar to # 3.7.43.8.3.3 Intercoat Adhesi
34、onsee 3.8.2ENGINEERING MATERIAL SPECIFICATIONESK-M62J26-AWP 3948-b Page 8 of 8 3.8.3.4 Chip Resistancesee 3.7.1NotePanel s with a repair coat on unsanded topcoat(standa rd bake) as well as test panels with arepa ir coat of catalysed topcoat (100 C bake) onunsanded topcoat (standard bake) must meet t
35、herequirements of # 3.7.1.3.8.3.5 Stone-chipFLTM EU-BI 57-2 Rating 1 maximumFLTM EU-BI 57-4 Rating 4 maximumOnly chipping of the topcoat is to be evaluated.3.9 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which ap
36、proval wasoriginally granted.Pr ior to making any changes in the properties, composition,co nstruction, color, processing or labelling of the materialorig inally approved under this specification, whether or not suchchange s affect the materials ability to meet the specificationrequir ements, the Su
37、pplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposed changesand obtain the written approval of the Materials Engineeringactivity. Test data, t est samples and a new code identification areto be submitted with the request.Substance restrictions imp
38、osed by law, regulations or Ford apply tothe materials addressed by this document. The restrictions aredefined in Engineering Material Specification WS S-M99P9999-A1, unlessa different suffix (e.g., A2 or A3) is specified on the engineeringdocument for the application.3.10 APPROVAL OF MATERIALSMater
39、ials defined by this specification must have prior approval bythe responsible Materials Engineering activity. Suppliers desiringapp roval of their materials shall first obtain an expression ofintere st from the affected Purchasing, Design and MaterialsEngineering activity. Upon request, the supplie
40、r shall submit to theaffected Materials Engi neering activity its own laboratory report tothe specification (test results, not nominal values), the materialdesignation and code nu mber, and test specimens for Ford evaluation.Upon approval, the material will be added to the Engineering MaterialApproved Source List.
