1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1990 09 17 NB00E1005894000 Released D.DiGregoria E.Rezendes M.PerchardWP 3948-a Page 1 of 10 SEALER, HOT MELT, PREFORMED, MAGNETIC, ESB-M4G322-APAINTABLE1. SCOPEThe mate rial defined by this specification is an e
2、xtruded ethylene vinylacetate base hot melt sealer with a magnetic composition . This material wasorigina lly used to seal horizontal and vertical weld joints, such as thelower bac k panel to quarter panel. The material must be applied overelectrocoat or spray primer.2. APPLICATIONThis mat erial is
3、suitable for use on interior and exterior Class No. 2sur faces, and will present an acceptable appearance for such areas whenpainted.Compliance with the performance requirements of this spe cification does notguaran tee the hot melt sealers will function for all similar applicationson a vehicle. The
4、 specific design condition should be e valuated by a planttrial or laboratory simulation prior to production relea se of the material.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q-101. A mutually acceptable Control Plan as describ
5、edtherein 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 AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared a
6、nd/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 material laboratory. All samples sha ll produce IR spectraand thermograms that c
7、orrespond to the reference standard when testedunder the same conditions.ENGINEERING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 2 of 10 3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on ma terial conditioned ina control led atmosphere of 23 +/- 2 C and 50 +/- 5
8、% relativehumidity for not less than 24 h prior to testing and tested under thesame conditions unless otherwise specified.3.4 DIMENSIONS As specified on engineeringdrawing and/or in Trim and SealerManual3.5 CONSISTENCY(ASTM D 1321, 100 g total load)3.5.1 As received 2.0 - 4.0 mm3.5.2 Aged, 72 h at 4
9、9 C 2.0 - 4.0 mm3.6 SOLIDS, min 99 %(ASTM D 2046, except heat at 102 +/- 3 Cfor 3 h in a mechanical convection oven)3.7 ASH (based on solids weight), max 63 %Test Method: Place cru cible containing the solids residue in a coolmuffle furnace. Slowly heat to and maintain at 760 +/- 30 C for 1 h,cool i
10、n desiccator, and weigh.3.8 SPECIFIC GRAVITY, min 1.8(ASTM D 297, Hydrostatic Method)Toler ance for any supplier shall be +/- 0.01 based on the recordedspecific gravity of his originally approved production sample.3.9 TENSILE STRENGTH, min Low Bake 1.4 kPa(ASTM D 412, Die “C“, High Bake 3.4 kPaPulle
11、d at 25 mm/min)3.10 ELONGATION, min Low Bake 22 %(ASTM D 412, Die “C“) High Bake 22 %3.11 MANDREL BEND TEST No cracking or(FLTM BV 22-1, material bake schedule per adhesion failure5.3, heat age test specimen 14 days at 70+/- 1 C before test)3.11.1 Test at 23 +/- 2 C3.11.2 Test at - 29 +/- 1 CENGINEE
12、RING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 3 of 10 3.12 FLOW CHARACTERISTICS, mm(Material bake schedule per para 5.3)3.12.1 Minimum Bake Exposure 0 - 3 mm3.12.2 Maximum Bake Exposure 0 - 3 mmTest Method: Two 0.8 x 100 x 150 mm electrocoat ed panels areto be us ed for determining flow prop
13、erties. Panels coatedwith electrocoat paint described per para 5.2 ma y be used fortesting. Apply a 1.5 x 25 x 125 mm ribbon of material ontwo ele ctrocoated panels. See sketch below. To assureuniform material contact , roll the material ribbon with a2.0 kg oller (ASTM D 100 0) using one forward and
14、 backwardstroke. Scribe each panel to mar k the original material location.Position test panels at 53 +/- 2 deg attitude and condition1 h at 23 +/- 2 C. See sketch. It is recommended that a metal panel rack, manufacturedby A tlas Electric Devices Corp. - Chicago, IL, ModelNo.19-1323-00, or equivalen
15、t, be used to maintain the testpanels at the 53 +/- 2 deg attitude during flowevaluation tests. Maintain the test panels at a 53 +/- 2 deg angle andcure one panel at the mi nimum bake schedule per para 5.3.Subject the remaining test panel to the maximumbake schedule per para 5.3. Allow panels to coo
16、l at a 53 +/- 2 deg attitude for 1 hat 23 +/- 2 C. Deter mine flow by measuring the distance the materialhas m oved below the scribe marks. After flow test, thematerial shall appear as a continuous uninterrupted film;any sealer separation will constitute a failure.FLOW TESTENGINEERING MATERIAL SPECI
17、FICATIONESB-M4G322-AWP 3948-b Page 4 of 10 3.13 ADHESIONShall not be removable in a continuous coherent film when subjectedto the following environments:3.13.1 Normal, 24 h at 23 +/- 2 C3.13.2 Salt Spray, 500 h(ASTM B 117)3.13.3 Thermal Cycle (5 Times). 4 h at 83 +/- 2 C. 4 h at 38 +/- 1 C and 95 -
18、100 % R.H. 16 h at - 29 +/- 1 C. 4 h at 38 +/- 1 C and 95 - 100 % R.H. 4 h at 83 +/- 2 C. 4 h at - 29 +/- 1 CSa mple Preparation: For each adhesion test exposure notedabove, prepare samples as follows:. Ap ply a 1.5 x 25 x 200 mm ribbon of material along thecenter line of two 0.8 x 100 x 300 mm pane
19、ls. Use a 2 kg roller, as described in para 3.12 to assure uniform materialcontact with panel. Subjec t one panel of each substrate to the minimumbake schedule, and the other panel to the maximum bakeschedule described per para 5.3. Panels are to be in a flatattitude during bake cycle. Condi tion pa
20、nels at 23 +/- 2 C for 1 h minimum in aflat position.Test Method:. Subject test panels to exposures noted. Condition panels at 23 +/- 2 C for a minimum of 2 h priorto evaluating adhesion. Eva luate sealer adhesion to each test panel by makingtwo parallel cuts across ribbon of material. Cuts shouldbe
21、 through to metal and 25 mm apart. Check adhesionby inserting the tip of a squared spatula under the edgeof th e 25 mm wide section of material, and then attemptto ha nd peel sealer at a 90 deg angle to panel.Material should fail cohesively rather than delaminatingcleanly from substrate surface.3.14
22、 LOW TEMPERATURE RESISTANCE No cracking oradhesion failureENGINEERING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 5 of 10 Test Method:. Prepare and cure two test panels of each substrate usingprocedure described in para 3.13. After minimum and maximum bake schedu les, condition samples at 23+/-
23、 2 C for 1 h minimum. Expose all test panels for 7 days at 70 +/- 2 C. After he at exposure, condition panels at 23 +/- 2 C for 1h minimum. Attach each test panel along the bott om edge of a 0.8 x 300 x 300mm CRLC steel panel with pop-rivets or sheet metal screws. Thelong side of test panel should a
24、lign with bottom edge of 300 x 300mm panel.3.15 BRIDGINGTest Method:. Prepare two test fixtures using 0.8 x 100 x 300 mm electrocoatedanels prepared per para 5.2 as shown in Figure 2.FIGURE 2BRIDGING TEST FIXTURE PREPARATIONENGINEERING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 6 of 10 . Apply
25、 a 1.5 x 25 x 200 mm ribbon of material to each test fixtureas shown in Figure 3.FIGURE 3SEALER APPLICATION. Cure one test fixture at the minimum bake sch edule per para 5.3.1.Subject the second test fixture to the maximum bake schedule perpara 5.3.1. Allow test fixtures to cool for 1 h at 23 +/- 2
26、C. Inspection Test Method:. Inspect test fixture to insure that material has satisfactorilybridged raised portion of panel as shown in Figure 2, SectionB. Any evidence of tearing will constitute a failure. Material has satisfactorily bridged metal-to-metal portion ofthe panel as shown in Figure 2, S
27、ection A. Any evidence ofgapping will constitute a failure.ENGINEERING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 7 of 10 . Place assembled panels and cold slam apparatus described in FLTMBN 1-2 in a cold box and condition at - 29 +/- 2 C for a minimumof 4 h. Individually mount 3 00 x 300 mm p
28、anels on the slam apparatus withthe test material at the bottom facing away f rom fixture. Slam 10times at - 29 +/- 2 C.3.16 COMPATIBILITY WITH PRODUCTION PAINTSThis material shall be compatible with all current production paintsystems.No tackiness, porosity, cracking, or other delet erious effects
29、on topcoats are permissible, unless they are within acceptable appearancestandards established for Class No. 2 surfaces.3.16.1 240 h Weatherometer Exposure(Equipment described in FLTM BO 1-1)3.16.2 96 h Dry Ultraviolet Light Source(Equipment described in FLTM BV 7-2)Tes t Method: Evaluate current pr
30、oduction spray primers and topcoat pa int systems as identified by the Body and ChassisEngineering Office. Three 0.8 x 100 x 300 mm panels of substrate described inpara 6.2 are to be prepared for each top coat systemevaluated. Apply material ribbon “A“ (1.5 x 25 x 125 mm) on centerline of substrate
31、panels as shown in Figure 4. Use 2 kgroller as described in para 3.10.2. Apply appropriate spray primer to entire surface of panelsper ESB-M2P4. Cure primer 10 minutes at 149 +/- 2 C metaltemperature. Allow panels to cool to 23 +/- 2 C and apply materialribbon “B“ (1.5 x 25 x 125 mm) as shown in Fig
32、ure 4. Rollwith 2 kg roller per para 3.12.2 taking care to avoidroller contact with first ribbon applied. Apply appropriate top coat paint to entire test panelsurface per ESB-M2P4. Cure top coat 8 minutes at 120 +/-1 C metal temperature plus a peak of 3 minutes at 130 +/-2 C metal temperature. Subje
33、ct one panel of each top coat system to exposures perpara 3.16.1 and 3.16.2. Retain remaining panel as control. After exposures are completed, examine test panels andcompare to control panel.ENGINEERING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 8 of 10 3.17 PACKAGINGThe material shall be supp
34、lied in sealer packages and materialblocking is not permitted during container shipping or storage.3.18 STORAGE STABILITYThe material shall be stored at temperatures bel ow 41 C away from allsources of heat and sunlight. Heat greatly acce lerates aging. Underthese storage conditions, the minimum she
35、lf life of the materialshall be 6 months. When these materials are stored at temperaturesbelow 23 C, they shall be conditioned at room temperature 24 h priorto application. Adequate conditioning permits t he material to obtainits optimum application properties.3.19 FOGGING TEST(FLTM BO 116-03)Fog Nu
36、mber, min 60 %Any fog film present sh all be examined for the formation of dropletsor coalescence into a clear film. Such conditio ns, if present, shallbe cause for rejection. Uncured and cured samples shall be tested.3.20 FUNCTIONAL APPROVALMaterial being evaluated for initial approval to this spec
37、ificationshall be subjected to a production trial. Functional trial resultsshoul d be available to Design and Materials Engineering prior tomaterial approval and release.3.21 ADDITIONAL REQUIREMENTSSpecific requirements for material and/or manufa ctured parts shall bespecified on the engineering dra
38、wing, engineerin g parts specificationand/or performance specifications. All critical areas with respect tothese properties shall be designated on the Engineering drawing.3.22 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the materi
39、al upon which approval wasoriginally granted.Pri or to making any change in the properties, composition,constr uction, color, processing or labeling of the materialorig inally approved under this specification, whether or not suchchange s affect the materials ability to meet the specificationrequir
40、ements, the Supplier 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.ENGINEERING
41、MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 9 of 10 Substance restrictions imposed 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 spec
42、ified on the engineeringdocument for the application.4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresponsible Materials Engineeri ng activity. Suppliers desiring approval ofthe ir 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 its own laboratory rep ort to the specification (test results, notnominal values), the material designation and code number, and testspecim ens for Ford eva
44、luation. Upon approval, the material will be addedto 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 OVENThe mechanical oven(s) used
45、 to cure the material shall be capable ofobtaining 205 C metal temperature on body steel (0.8 - 0.9 mmthickness) within 8 - 10 minutes.5.2 SUBSTRATESNominal panel dimensions are 0.8 x 100 x 300 mm.Ele ctrocoat primed steel panel: Prepared per ESB-M2P4 performancespecification. Use current production
46、 paints as identified by theBody and Chassis Engineering Office.5.3 MATERIAL CURE SCHEDULES5.3.1 Minimum (includes two bakes):Bake Schedule I 10 minutes at 149 +/- 1 C metaltemperatureBake Schedule II 8 minutes at 102 +/- 1 C metaltemperatureplus3 minutes at 130 +/- 1 C metaltemperature5.3.2 Maximum: 20 minutes at 177 +/- 1 C metaltemperature5.4 COLOR Dark Brown or as specifiedby B&AGOENGINEERING MATERIAL SPECIFICATIONESB-M4G322-AWP 3948-b Page 10 of 10 FIGURE 4PAINT COMPATIBILITY
