1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1998 05 11 Activated W. Curtiss W. ScholzWP 3948-a Page 1 of 13SEALER/TAPE, DUAL LAYER, HEAT CURING, WSS-M4G362-APAINTABLE1. SCOPEThe material defined by this specification is a heat curing dual layersealer/tape;
2、 the top layer is a paintable, non-tacky, non-flowing filmand the bottom layer is a flowable, thermosetting sealer.2. APPLICATIONThis specification was released originally for material used to seal theroof ditch joint and provide a smooth surface for adhesively bonding aroof ditch molding. The mater
3、ial is applied on the sealer deck aftervehicle electrocoat. The film portion of the sealer/tape is paintableand is suitable for use on non-visible exterior surfaces. The sealerportion of the tape has flow properties providing a seal for the metaledge and any potential weld burn throughs. Note: Flow
4、properties of thismaterial may be adjusted depending on the application and plantconditions. The 45 degree flow must be specified on the engineeringdrawing. Material performance limits listed herein are representative ofthe sealer/tape released for the original application.3. REQUIREMENTS3.1 QUALITY
5、 SYSTEM REQUIREMENTSMaterial suppliers and part producers must conform to QualitySystem Requirements, QS-9000. Material specification requirementsare to be used for initial qualification of materials. A ControlPlan for ongoing production verification is required. This planmust be reviewed and approv
6、ed by the relevant Ford Materialsactivity and/or Ford Supplier Technical Assistance (STA) prior toproduction parts submission. Appropriate statistical tools mustbe used to analyze process/product data and assure consistentprocessing of the materials.Part producers using this material in their produc
7、ts, must useFord approved materials and must conform to a process control planwhich has been approved by STA and/or the relevant MaterialsActivity.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 2 of 133.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its opti
8、on, may conduct infrared and/orthermal analysis of material/parts supplied to this specification.The IR spectra and thermograms established for initial approvalshall constitute the reference standard and shall be kept on fileat the designated material laboratory. All samples shall produceIR spectra
9、and thermograms that correspond to the referencestandard when tested under the same conditions.3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on material conditionedin a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for not less than 24 h prior t
10、o testing and tested underthe same conditions unless otherwise specified.3.4 DIMENSIONS As specified on engineeringdrawing and/or in Trim and Sealermanual3.5 MATERIAL PROPERTIES3.5.1 Solids (without film), min 98 %(ASTM D 2834, except heat at 102 +/- 3 Cfor 3 h in a mechanical convection oven)3.5.2
11、Ash (based on solids weight)(ISO 3491, Method A, 760 +/- 30 C,reference para 5.2)The ash content tolerance for any one supplier shall be+/- 5 % based on the recorded ash content for theiroriginally approved production sample.3.5.3 Specific Gravity(uncured material - with film)(ASTM D 297, water disp
12、lacement method:reference para 5.3)The specific gravity tolerance for any one suppliershall be +/- 0.1 based on the recorded specific gravityof their originally approved production sample.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 3 of 133.5.4 Shelf Life90 Day Storage Stability at
13、23 +/- 2 C and 32 +/- 2 C.The supplier shall provide flow properties and curedadhesion data from initial through 90 days storage at 23+/- 2 C and 32 +/- 2 C. Measurements shall be taken atmonthly intervals. Data shall be made available toMaterials Engineering prior to addition to the ApprovedSource
14、List.Note: Heat greatly accelerates aging. Storage conditionsfor materials conforming to the requirements of thisspecification may vary depending on the individualproduct chemistry. In all cases, shelf life at 23 +/- 2C shall be a min of 45 d.3.6 MANUFACTURING PROPERTIES(with and without polyester f
15、ilm)3.6.1 Flow Properties Horizontal 45 degree2 - 7 mm *Test Method: Horizontal Panels - Apply a section ofsealer/tape (with film) 150 x 25 +/- 0.1 to three 300 x100 x 0.80 mm electrocoated steel panels per para 5.5.45 Degree Panel - Apply a 3.7 cm2 section of sealer/tape(without film) to the center
16、 of three 300 x 100 x 0.80mm electrocoated panels.Horizontal and 45 Degree Test - Preheat the panels for15 minutes at 110 +/- 2 C prior to sealer application.This will heat stake the sealer to the panel. Allow thepanels to cool at 23 +/- 2 C for 30 minutes. Scribe theoriginal location of the samples
17、 prior to baking.Horizontal Panels - Bake the panels flat per the minbake schedule in para 5.4. Repeat this procedure for themax bake schedule.45 Degree Panels - Bake the panels at a 45 degreeorientation per the min bake schedule in para 5.4.Repeat this procedure for the max bake schedule.Remove pan
18、els from oven, cool, and measure material flowfrom original scribe. Save panels for para 3.7.4.*45 degree flow will be specified on the engineeringdrawing and on the part/material control plan.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 4 of 133.6.2 Curl TestNo curl allowed after 2
19、rebakes.Test Method: Apply a section of sealer/tape (with film)150 x 25 +/- 0.1 to three 300 x 100 x 0.80 mmelectrocoated steel panels per para 5.5.Preheat the panels for 15 minutes at 110 +/- 2 C priorto sealer application. This will heat stake the sealerto the panel. Allow the panels to cool at 23
20、 +/- 2 C for30 minutes.Prepare test panels per matrix in Table 1, processnumber 2. Use current production paint as identified bythe appropriate engineering office. Record any curlingof the film after initial paint application.Using a razor blade, cut through the paint film at oneside edge and the to
21、p edge of each sample. The cut shallbe made approximately 1 mm away from the polyester film.Do not cut the polyester film.Subject the panel to an additional basecoat/clearcoatbake. Remove from oven and observe for evidence ofcurling. Repeat this procedure once more for a total of3 basecoat/clearcoat
22、 bakes.Report any evidence of curling and the paint systemused.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 5 of 133.6.3 Bridging3.6.3.1 Overlap JointTest Method: Prepare two test f ixturesusing 0.8 x 100 x 300 mm electrocoatedpanels prepared per para 5.5 as shown inFigure 1.FIGURE 1
23、BRIDGING TEST FIXTURE PREPARATIONENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 6 of 13Apply a 25 x 200 mm ribbon of material (with film) toeach test fixture as shown in Figure 2.FIGURE 2SEALER APPLICATION. Position ribbon such that it is centered over theseam. Cure one test fixture at
24、 the min bake schedule perpara 5.4. Subject the second test fixture to the maxbake schedule per para 5.4. Allow test fixtures to cool for 1 h at 23 +/- 2 C. Inspection Test Method:. Inspect test fixture to insure that material hassatisfactorily bridged raised portion of panel asshown in Figure 2, Se
25、ction B. Any evidence oftearing will constitute a failure.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 7 of 13. Inspect test fixture to insure that material hassatisfactorily bridged metal-to-metal portion ofthe panel as shown in Figure 2, Section A. Anyevidence of gaping will consti
26、tute a failure.3.7 ENGINEERING REQUIREMENTS3.7.1 Adhesion (with film)Shall not be removed in a continuous coherent film whensubjected to the following environments.3.7.1.1 Normal, 24 h at 23 +/- 2 C3.7.1.2 Salt Spray, 500 h(ASTM B 117)3.7.1.3 Thermal Cycle. 4 h at 90 +/- 2 C. 4 h at 38 +/- 1 C and 9
27、5 - 100 %relative humidity. 16 h at - 30 +/- 1 C. 4 h at 38 +/- 1 C and 95 - 100 %relative humidity. 4 h at 90 +/- 2 C. 16 h at - 30 +/- 1 CSample preparation: SAE J1600, Method B,with the following modifications:. Apply a 75 x 200 mm strip of materialalong the center line of twoelectrocoated steel
28、panels prepared perpara 5.4. Cure the material per bake schedules inpara 5.5. Report failure mode.3.7.2 Low Temperature Resistance No cracking or(FLTM BV 101-02) loss ofadhesionPlace the panels prepared in para 3.6.1 in the slammingapparatus. Condition 4 h at - 40 +/- 1 C. The panelshall be slammed
29、a total of 20 times.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 8 of 133.7.3 Compatibility with Production Paints -Initial RequirementsNo tackiness, staining, discoloration, dulling,softening, paint transfer, significant color shift,difference in orientation of metallic flakes (meta
30、llicpaints) or other objectionable appearance defects in thepaint over the sealer.Note: Evidence of any defects as stated above shall bereviewed with Vehicle Operations and MaterialsEngineering.Test Method:. Prepare test panels per matrix in Table 1. Usecurrent production paints as identified by Mat
31、erialsEngineering. (Panels shall be kept horizontal priorto baking, during the painting operation and duringcure. Use gas fired oven for paint cure.). Condition painted panels at 23 +/- 2 C for 4 - 24 h. After 4 - 24 h at 23 +/- 2 C, perform the followingtests on each panel:. Cross hatch adhesion ch
32、eck - FLTM BI 106-01,Method B. Resistance to Xylene - using a back and forthmotion, rub surface of enamel 10 times with asmall wad of cheesecloth which has been wettedwith xylene.3.7.4 Compatibility with Production Paints -Weathering RequirementsNo tackiness, staining, discoloration, chalking, gloss
33、change or other deleterious effects on topcoats whencompared to paint not over sealer.Test Method:. Prepare test panels per matrix in Table 2. Usecurrent production paints as identified by the BodyEngineering Office. (Panels shall be kept horizontalprior to baking, during the painting operation andd
34、uring cure.). Condition painted panels at 23 +/- 2 C for 72 h.ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 9 of 13. Subject panels for each paint/bake condition to eachexposure listed below. Retain an unexposed panel ascontrol.3.7.4.1 Heat Age 14 d at 102 C3.7.4.2 10 Thermal Cycles(a
35、s described in para 3.7.1.3). After exposure, perform the followingevaluation on each panel:. Cross hatch adhesion test per FLTMBI 106-01. Examine test panels and compare tothe control panel and to the paintnot over sealer side of the panelfor evidence of tackiness, staining,discoloration, gloss cha
36、nge,adhesion loss, or other deleteriouseffects on top-coats.3.8 QUALITYMaterial shall be a homogeneous product. It shall be consistentin color and texture, and free from objectionable odors duringnormal storage. It shall be suitable for the intended application.3.9 FUNCTIONAL APPROVALMaterials being
37、 evaluated for approval to this specification shallbe subjected to a production trial. Functional trial results mustbe approved by the affected assembly operation and DesignEngineering. Results shall be made available to MaterialsEngineering prior to material approval and release.3.10 ADDITIONAL REQ
38、UIREMENTSSpecific requirements for material and/or manufactured parts shallbe specified on the Engineering drawing, Engineering partsspecification and/or performance specification. All critical areaswith respect to these properties shall be clearly designated onthe engineering drawing.ENGINEERING MA
39、TERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 10 of 133.11 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inall characteristics to the material upon which approval wasoriginally granted.Prior to making any change in the properties, composition,construction,
40、color, processing or labeling of the materialoriginally approved under this specification, whether or not suchchanges affect the materials ability to meet the specificationrequirements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposedcha
41、nges and obtain the written approval of the MaterialsEngineering activity. Test data, test samples and a new codeidentification are to be submitted with the request.Substance restrictions imposed by law, regulations or Ford, applyto the materials addressed by this document. The regulations aredefine
42、d in Engineering Materials Specification WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMaterials defined by this specification must have prior approval by theresponsible Materials Engineering activity. Suppliers desiring approvalof their materials shall first obtain an expression of interest from theaffec
43、ted Purchasing, Design and Materials Engineering activity. Uponrequest, the Supplier shall submit to the affected Materials Engineeringactivity a completed copy of their laboratory test reports, signed by aqualified and authorized representative of the test facility,demonstrating full compliance wit
44、h all the requirements of thisspecification (test results, not nominal values), the materialdesignation and code number, and test specimens for Ford evaluation.Fords engineering approval of a material will be based on itsperformance to this specification and on an assessment of suitabilityfor intend
45、ed processes and/or applications. Upon approval, the materialwill be added to the Engineering Material Approved Source List.5. GENERAL INFORMATIONThe information given below is provided for clarification and assistancein meeting the requirements of this specification.5.1 MECHANICAL CONVECTION OVENTh
46、e mechanical convection oven(s) used to cure the material shallbe capable of obtaining 205 C metal temperature on body steel (0.8- 0.9 mm thickness) within 8 - 10 minutes.5.2 ASH CONTENT, Typical 10 % based onsolids weightENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 11 of 135.3 SPECI
47、FIC GRAVITY, Typical 1.155.4 BAKE SCHEDULESFirst Min Bake: 8 minutes at 135 +/- 1 C metal temperature(15 minutes total oven time max)Second Min Bake: 10 minutes at 130 +/- 1 C metal temperature(17 minutes total oven time max)Max Bake: 20 minutes at 177 +/- 1 C metal temperature(not less than 30 minu
48、tes total oven time)5.5 SUBSTRATESElectrocoat primed steel panel 100 x 300 x 0.80 mm prepared perWSS-M2P180-A performance specification. Use current productionpaints as identified by Materials Engineering.5.6 HARDNESS, Typical 50 - 60(ASTM D 2240, Durometer D)5.7 CURED TENSILE STRENGTH (without film
49、), typical 2.0 - 5.0 MPa(ASTM D 412, Die C, pulled at 500 mm/minute. Curedat min bake schedules per para 5.4. Tested at23 +/- 2 C)5.8 CURED ELONGATION (without film), typical 60 - 150 %(Tested per para 5.7)ENGINEERING MATERIAL SPECIFICATIONWSS-M4G362-AWP 3948-b Page 12 of 13TABLE 1 - INITIAL PAINTABILITY MATRIX1. Materials: Sealer, primer and topcoat as specified2. Topcoat Colors: White, red, black and silver3. Panel Preparation: See chart_| | | | | | | PANEL
