1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes90 10 30 NB00I 10102099 Released C. Roebuck J. Macciocco M. PerchardWP 3948-a Page 1 of 11 SEALER, VINYL, PAINTABLE, CHIP RESISTANT, 0.25 MM WSB-M4G276-CMINIMUM FILM THICKNESS1. SCOPEThe mat erial defined by this
2、 specification is a vinyl based, heat curingsealer wh ich can be airless sprayed to a 0.25 - 0.40 mm film onelectr ocoated substrates, to provide a paintable corrosion resistant filmwhich will withstand stone chipping.2. APPLICATIONThis specification was released originally for material used overele
3、ctrocoated substrates and cu res during the body spray primer bake cycleon the lower bodyside of passenger cars and light trucks . Peeling shall notoccur because the material exhibits excellent adhesion t hrough a 0.1 - 0.40mm film thickness range.3. REQUIREMENTSAll te st panels used for evaluating
4、this material must be approved “PaintTest Quality“ (PTQ) steel panels. Suppliers submitting s amples for approvalto this specification should include all identification numbers, etc., thatdefine the origin of these steel panels.3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Fo
5、rd 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 product is continuously reduced.3.2 INFRARED SPECTROPHOTOMETRY A
6、ND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/ortherma l analysis of material/parts supplied to this specification.The IR spectra and thermograms established for i nitial approval shallconst itute the reference standard and shall be kept on file at thedesignated m
7、aterial laboratory. All samples sha ll produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 2 of 11 3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based
8、on ma terial conditioned ina control led atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for not less than 24 h prior to testing and tested under thesame conditions unless otherwise specified.3.4 FILM THICKNESS AND BAKE TEMPERATURE REQUIREMENTSMinimum Maximum3.4.1 Film Thickness, mm 0.25 0.
9、403.4.2 Bake Schedule 8 minutes at 50 minutes at(Metal Temperature) 135 +/- 2 C 180 +/- 2 C3.5 COLOR White or as specified in theSealer Manual3.6 SOLIDS, min 92 %(ASTM D 2834, except heat for 3 h at 100+/- 3 C in a mechanical convection oven)3.7 VISCOSITY(FLTM BV 103-01, 1.3 mm orifice, 280 kPaair p
10、ressure)3.7.1 As Received 7 - 25 s3.7.2 Aged, max 80 s(72 h at 40 +/- 2 C)3.7.3 Shelf Life Increase, max 10 %(90 days at 23 +/- 2 C)3.8 WEIGHT PER VOLUME, at 23 +/- 2 C 1.30 - 1.40 kg/L(ASTM D 816)3.9 SPRAYABILITY AND APPEARANCEShall be capable of being spray applied in a smooth uniform coatingfrom
11、0.25 - 0.40 mm thickness when applied using the airless sprayequ ipment specified by Body and Assembly Paint Operations. Thecoating shall not exhib it craters, pinholes, sags, abnormal wavinessor other objectionable appearance conditions.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 3
12、 of 11 3.10 CURE CHARACTERISTICSNo evidence of plasticizer migration, cracking, blistering, loss offlexibility, or failure to adhere to electrocoat ed metal. The sealershall not cause tackiness of the primer or enamel, or discolorationof the enamel topcoat after exposure to current production baking
13、schedules.Test Method:. Prepare panels as described in Table I. Examine panels for any of the conditions noted above. Mak e two parallel cuts, 25 mm apart, through the sealer with asharp knife. Insert the tip of the sharp knife under the edge ofthe sealer and cut a tab 38 mm long. Grasp the tab and
14、attempt topeel at 180 deg. Observe for an y indication that the film fails toadhere or is brittle or friable. Save sample for Low Temperature Resistance Test (para 3.12).3.11 HEAT STABILITYNo evide nce of blistering, cracking, charring, loss of adhesion orembrittlement when exposed to high temperatu
15、res.Test Me thod: Proceed as outlined in para 3.10, except use a primersurfacer maximum bake cycle. (Simulates production oven bake, seeTable I.)Save samples for Low Temperature Resistance Test (para 3.12).3.12 LOW TEMPERATURE RESISTANCE No cracking oradhesion failure.Test Method: Condition the pan
16、els prepared in para 3.10 and 3.11 for7 days at 70 +/- 2 C. Place the panels in the slamming apparatusdescribed in FLTM BV 101-02 and condition for 4 h at - 30 C. Thepanels shall be slammed a total of 10 times.3.13 CURED SEALANT PROPERTIES3.13.1 Tensile Strength, min 6.5 MPa(ASTM D 412, Die C, 300 m
17、m/minute)For sample preparation see para 3.13.4. Normal and aged 2weeks at 70 +/- 2 C.3.13.2 Elongation at Tensile Break, min 75 %Normal and aged 2 weeks at 70 +/- 2 C.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 4 of 11 3.13.3 Tear Strength, min 15.5 kN/m(ASTM D 624, Die C, 500 mm/m
18、inute)For sample preparation see para 3.13.4. Normal and aged 2weeks at 70 +/- 2 C.3.13.4 Cured Sealant Sample PreparationCure a sealant slab 150 x 150 x 0.51 +/- 0.05 mm in amec hanical convection oven. Use the minimum bake scheduleslisted in para 3.4.2. Die cut samples for tensile, elong ation,and
19、 te ar, taking care to avoid serious air inclusion or thinareas in the control sections.3.14 HARDNESS AFTER CURING, Durometer A 60 - 80Test Meth od: Flow enough material into a container (such as anointment tin) to give a cured section 5 mm thick. Bake for 30 minutesat 160 +/- 2 C in a mechanical co
20、nvection oven. Check the hardness4 h after removal from the oven.3.15 SAG, max 0.5 mmThe sag resistance shall be mea sured after the material has undergoneairless spraying.Test Method:. Spray the material at a 300 mm distance through a 517 ti p at 20 mPapressure onto a clean steel panel. Using the s
21、prayed material, pre pare two 25 x 200 x 0.75 mm ribbonsof sealer on electrocoated metal panels. Perm it the panel to air dry for 30 minutes at 23 +/- 2 C in averti cal attitude with the 200 mm dimension of the sealerhorizontal. Ba ke the panel for 15 minutes at 160 +/- 2 C in a mechanicalconvect io
22、n oven. The panel is to be held in a vertical attitudewith the 200 mm dimension of the sealer horizontal. Allow the panel to cool to 23 +/- 2 C and measure the sag.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 5 of 11 3.16 INVERTED BAKENo evidence of cracking, bliste ring separation f
23、rom the metal or lossof material.Test Method:. Spray two 25 x 200 x 0.75 mm patterns of sealer on an el ectrocoated300 x 300 x 0.89 mm CRS panel. Use masking tape to control the pattern size. Invert the panel and air dry for 15 minutes at 23 +/- 2 C. Heat the panel in the inverted position for 15 mi
24、nutes in amechanical convection oven maintained at 160 +/- 2 C.3.17 STAININGNo staini ng or other deleterious effects on light colored enamel asa result of exposure to dry ultraviolet light.Test Method:. Prepare panels as described in Table I. Condition panels for 24 h at 23 +/- 2 C. Mask o ne-half
25、of the panel and expose for 96 h in the fluorescentsunlamp cabinet specified in FLTM BV 107-02. Examine the exposed and unexposed portions of the sealant.3.18 PAINTABILITY3.18.1 Initial AppearanceNo significant color shift, difference in orientation ofmeta llic flakes (metallic paints) or other obje
26、ctionableappearance defects in the paint over the sealer.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 6 of 11 3.18.2 WeatherabilityNo sta ining, discoloration or other deleterious effect onwhite or colored ESB-M33J quality baking enamel as a resultof weatherometer and Florida exposur
27、e.Test Method:. Prepare 2 sets of panels as described in Table I. Examin e for any difference of appearance of paint betweentop and bottom of panel. Expo se 1 set of 6 panels for minimum of 530 kJ/m2according to SAE J1960. Expose 1 set of 6 panels for 12 months at an angle of 90deg facing south in t
28、he Miami, Florida area.3.19 CORROSION RESISTANCE, min 1000 h(ASTM B 117)Shall protect CRS from corrosion. No loss of sealer adhe sion extendingmore than 13 mm or corrosion ex tending more than 3 mm from the scribeor exposed edges.Test Method:. Prepare panels as described in Table I. Scribe an “X“, w
29、ith approximately 100 mm legs, through to basemetal on all 8 prepared panels. Subject the panels to 1000 h salt spray per ASTM B 117. After allowing the panels to re st for 48 h at 23 +/- 2 C, evaluateadhesi on by cutting a 19 mm wide tab about 38 mm long in 1 end ofthe se aler. Insert the tip of a
30、sharp knife under the tab, graspwith t he thumb and attempt to peel at 90 deg to 180 deg along the250 mm dimension. Remove t he sealer from the lower 1/2 of the test panel by firstscraping off most of the sealer with a spatula, avoiding scratchingthe metal surface. Remove the remaining layer of seal
31、er with asuitab le solvent and examine the metal surface for evidence ofcorrosion.3.20 CHIP RESISTANCE(SAE J400)A minimum of 95 % of the topcoat and virtually all of th e sealer shallbe retained on the test panel after 4.7 L of gravel.Test Method: Prepare panels as described in Table I.ENGINEERING M
32、ATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 7 of 11 3.21 PEEL ADHESION PROPERTIES 0.4 kN/m3.21.1 Exposure Conditions3.21.1.1 As received (room temperature)3.21.1.2 2 weeks at 90 +/- 2 C.3.21.1.3 1000 h salt spray.3.21.1.4 240 h water immersion.3.21.1.5 96 h fluorescent sunlamp (UV).3.21.1.6 530
33、kJ/m2 minimum (SAE J1960)3.21.1.7 12 months Florida exposure.Test Method:. Prepare 2 panels as described in Table I for each of theabove exposure conditions. Panels evaluated for otherrequirements may be utilized when applicable. After exposure, age panels for 48 h at 23 +/- 2 C. Make 2 parallel cut
34、s 25 mm apart through the base metalwith a sharp knife. Insert the tip of the knife and peelback a tab approximately 38 mm long. Using a suitable clamping device attach the tab of sealerto a Hunt er force gage or equivalent and peel vinyl atapproximately 135 degree angle.3.22 REPAIRABILITYMust be ca
35、pable of being repaired with materials currently approvedto ESB-M4G317.If the production coating cannot be repaired with the above approvedrepai r materials, the production coating supplier is obligated todevelop suitable spray and knife grade repair materials.3.23 ABRASIVESShall not cause premature
36、 failu re of the pumping equipment, the sprayguns o r the spray tips due to the presence of abrasive fillers, etc.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 8 of 11 Test Method: Dilute a 1 g samp le of the material with 1 g of M14J167Special Spirits and mix thoroug hly. Rub a porti
37、on of the diluted 100times between 2 pieces of flat, clean plate glass. The appearance ofscratches on the glass plate shall be considered failure.3.24 STORAGE STABILITYShall be stored at ambient room temperature below 38 C, away from allsources of heat. Heat greatly accelerates aging. Under these st
38、orageconditions, the minimum shelf l ife of the material shall be 3 months.When t his material is stored at temperatures below 23 C, it shall beconditi oned at room temperature prior to application. Adequatecon ditioning permits the material to obtain its maximum applicationproperties.3.25 QUALITYSh
39、all be a smooth homogeneous m ixture free from foreign materials andproperties detrimental to normal production operations.3.26 ADDITIONAL REQUIREMENTSSpecific requirements for mater ial and/or manufactured parts shall bespecified on the Engineering dr awing, Engineering parts specificationand/or pe
40、rformance specificatio ns. All critical areas with respect tothese p roperties shall be clearly designated on the engineeringdrawing.3.27 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equ ivalent in allchar acteristics to the material upon which approval was originally
41、granted.Prio r to making any change in the properties, composition,construction, color, processing or labeling of the mater ial originallyapproved under this specificati on, whether or not such changes affectthe materials ability to meet the specification requirements, theSupplier shall notify Purch
42、asing, Toxicology and the affectedMaterials Engineering activity of the proposed changes and obtain thewritten approval of the Materials Engineering activity. Test data,test sam ples and a new code identification are to be submitted withthe request.Substa nce restrictions imposed by law, regulations
43、 or Ford, apply toth e materials addressed by this document. The restrictions aredefined in Engineering Material Specification WSS-M99P9999-A1, unlessa differ ent suffix (e.g., A2 or A3) is specified on the engineeringdocument for the application.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948
44、-b Page 9 of 11 4. APPROVAL OF MATERIALSMaterials defined by this specification must have prior approval by theresponsible Materials Engineeri ng activity. Suppliers desiring approval oftheir mat erials shall first obtain an expression of interest from theaffecte d Purchasing, Design and Materials E
45、ngineering activity. Uponrequest, the Supplier shall submit to the affected Materials Engineeringactivi ty its own laboratory report to the specification (test results, notnominal values), the material designation and code number, and testspecimen s for Ford evaluation. Upon approval, the material w
46、ill be addedto the Engineering Material Approved Source List.5. GENERAL INFORMATIONThe information given below is provided for clarification and assistance inmeeting the requirements of this specification.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 10 of 11 TABLE 1 (Page 1 of 2) PAN
47、EL PREPARATION Page 1 Vinyl & Primer Bake SchedulePage 2 Topcoat Bake ScheduleSealer/PrimerBake Schedule(Metal Temp.)Vinyl Appliedover ESB-M6J152 8 minute at 50 minute atPara E-Coat Wet on Wet 135 +/- 2 C 180 +/- 2 CNo. Paragraph (mm) with Vinyl_ _ _ _ _ _3.10 Cure Character- 0.25 X Xistics3.11 Heat
48、 Stability 0.75 X X3.17 Staining 0.25 X X0.25 X X3.18 Paintability (1) 0.25 X X0.25 X X3.19 Corrosion 0.25 X XResistance 0.25 X X3.20 Chip Resistance 0.25 X X0.25 X X3.21 Adhesion (2) 0.1-0.40 X X0.1-0.40 X X(1) Apply sealer to bottom half of panel only.(2) Panels prepared to the appropriate bake sc
49、hedules and su bjected to theprop er exposure conditions may be evaluated in lieu of preparingadditional panels.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G276-CWP 3948-b Page 11 of 11 TABLE 1 (Page 2 of 2) PANEL PREPARATION TopcoatBake (Metal Temp.)ESB-M33J 10 minutes atNo. Paragraph Topcoat 130 +/- 2 C_ _ _ _3.10 Cure Character- X Xistics3.11 Heat Stability X X3.17 Staining X XX X3.18 Paintability (1) 5 Colors (3) XX (4) X3.19 Corrosion X X
