1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1991 07 30 NB00E10147324000 Released W. Curtiss E. Rezendes M. PerchardWP 3948-a Page 1 of 9SEALER, URETHANE BASED, HEAT CURING, PAINTABLE, WSB-M4G340-AANTI-CRACKING1. SCOPEThe material defined by this specificat
2、ion is a urethane based, extrudable,sag resistant, paintable, heat cure sealer.2. APPLICATIONThis specification was released originally for material used to sealexterior body coach joints where excessive movement in sheet metal occurs.This material can be applied to body electrocoat primed surfaces.
3、 Thematerial performs best if applied directly to the seam in a bead form.Minimize wiping or brushing the material since it is not easily removedfrom the electrocoated surface. The material is incompatible with vinylbased sealers and cross contamination must be avoided.3. REQUIREMENTS3.1 STATISTICAL
4、 PROCESSSuppliers must conform to the requirements of Ford Quality SystemStandard Q-101. A mutually acceptable Control Plan as describedtherein is required for material/source approval. Appropriatestatistical tools must be used to analyze process/product data sothat variation in the final product is
5、 continuously reduced.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/orthermal analysis of material/parts supplied to this specification.The IR spectra and thermograms established for initial approval shallconstitute the reference st
6、andard and shall be kept on file at thedesignated material laboratory. All samples shall produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on material conditi
7、oned ina controlled 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.NOT TO BE USED FOR NEW DESIGN2014 N Status No replacment named L. Sinclair ,NAENGINEERING MATERIAL SPECIFICATIONWSB-M4G3
8、40-AWP 3948-b Page 2 of 93.4 SOLIDS, min 95 %(ASTM D 2834, except heat at 100 +/- 2 Cfor 3 h in a mechanical convectional oven.Save sample for next test, para 3.5)3.5 ASH, max 50 %(Based on the solids weight)Test Method:. Place the crucible c ontaining the solids residue in a cool mufflefurnace. Slo
9、wly heat to and maintain at 760 +/- 30 C for 1 h. Cool crucible in a desiccator and weigh.3.6 WEIGHT PER VOLUME(ASTM D 816)The weig ht tolerance for any one supplier shall be +/- 0.02 kg/L,based on the recorded weight of his original approved productionsample.3.7 VISCOSITY(SAE J1524, VIS-2, 1.32 mm
10、orifice,280 kPa)3.7.1 As Received +/- 2 sec(Conditioning Method B)3.7.2 Aged, max No more than(Material aged in closed container 50 % increasefor 72 h at 40 +/- 1 C, conditioning from originalMethod B) approvalThe viscosity tolerance for any one supplier shall be +/- 2 sec,based on the recorded visc
11、osity of the original approved productionsample.Final a pproval of a specific material viscosity for productionshipments shall be made by the affected manufacturing activity. Inall c ases, the viscosity shall be within specification limits asidentified on the material control plan.3.8 BRIDGING, max
12、6 mm(SAE J243, ADS-9, Method D, non-flow). Condition the test fixture with material bead for 15 minutes at23 +/- 2 C, then bake fixture at the minimum bake schedule per para5.3. Measure the amount of material sag through hole.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G340-AWP 3948-b Page 3 of 93.9 SAG
13、 RESISTANCE3.9.1 Horizontal, max 6 mm3.9.2 Vertical, max 6 mm3.9.3 Inverted No loss ofmaterialTest Method:. Apply a 3 x 30 x 200 mm ribbon of material along the centerline of three electrocoa ted panels prepared per para 5.2. Scribe panels to mark the initial material location. Position the panels w
14、ith the material in the attitude abovefor 1 h. Immediately after conditioning, place panels in a n oven tocure material at the minimum bake schedule per para 5.3.Maintain panels in the specified attitude during baking andcooling. Allow the panel to cool to 23 +/- 2 C. Determine the sag by measuring
15、the material movem ent belowthe scribe mark.3.10 ADHESION(SAE J1600 - Method A, except spacer thickness shall be 6.0 mm)Shall not be peeled off in a continuous film at any thickness.Test Method:. Apply 6 - 0 mm tapered material ribbon on two electrocoated panelsprepared per para 5.2. Subject one tes
16、t pan el to the minimum bake schedule and the othertest panel to the maximum bake schedule identified per para 5.3. Condition panels after baking at 23 +/- 2 C for 1 h minimum. Evaluate adhesion by cutting a 25 mm wide str ip across the taperedribbon. Using the tip of a square spatula, lift the mate
17、rial atboth the thin and thick film edges then attempt to hand peelmaterial at 90 degrees from substrate. Save test panels for Heat Stability Test, para 3.11 and CorrosionResistance Test, para 3.12.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G340-AWP 3948-b Page 4 of 93.11 HEAT RESISTANCE TEST No eviden
18、ce of blistering,cracking, charring or otherdeleterious effectsTest Method: Examine the maximum bake panel prepared for Adhe sion Test, para 3.10,for any of the above conditions.3.12 CORROSION RESISTANCE TESTTest Method:. Expose the panels prepared in para 3.10 for 240 h in the salt spraycabinet des
19、cribed per ASTM B 117. Condition the test panels after exposure at 23 +/- 2 C for 24 h. Evaluate material adhesion as described in pa ra 3.10. Observe forany evidence of corrosion originating directly under material.3.13 MANDREL BEND TEST No cracking or(FLTM BV 122-01, material bake schedule adhesio
20、n failureper para 5.3, heat age test specimen 14days at 70 +/- 1 C before test)3.13.1 Test at 23 +/- 2 C3.13.2 Test at - 30 +/- 1 C3.14 CRACK RESISTANCE, min 5000 cycles(FLTM BV 115-01, bake 2 sets of panels per5.3 for normal and aged tests. Substratesidentified per para 5.2)ENGINEERING MATERIAL SPE
21、CIFICATIONWSB-M4G340-AWP 3948-b Page 5 of 93.15 COMPATIBILITY WITH PRODUCTION PAINTSNo tackiness, staining, discoloration, pinholing from sealeroutgassing or other deleterious effects on topcoats.3.15.1 Fluorescent UV Exposure 500 h(SAE J2020)3.15.2 14 days at 70 CTest Method:. Prepare test panels p
22、er SAE J1800, Method 3, using a sealergel oven bake of 10 minutes at 120 +/- 2 C, a primer bakeschedule of 135 +/- 1 C for 8 minutes metal temperature anda topcoat bake schedule of 130 +/- 1 C for 10 minutes metaltemperature. Apply current production paints as identifiedby the Body Engineering Mater
23、ials Office. Condition painted panels at 23 +/- 2 C for 72 h. Subject primed panels with topcoat to each ex posure listedabove. Retain extra panel as control. After exposure, examine test panels and compare to thecontrol panel.3.16 REPAINT CRACK RESISTANCE No cracksTest Method:. Fill the inside cove
24、 r of six can lids with sealer. The lids willhave a nominal diameter of 70 mm and a depth of 6 mm (see para5.6). Paint three test pan els (lids) per SAE J1800, Method 1 and Method2, use minimum bake schedule per 5.3.1. Apply current productionpaints as identified by the Body Engineering Materials Of
25、fice. Expose painted lids to the following paint re pair cycles 10 times:140 +/- 2 C for 17 minutes oven time23 +/- 2 C for 20 minutes. Observe for any evidence of paint/sealer cracking after each cycle.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G340-AWP 3948-b Page 6 of 93.17 SHEAR ADHESION, min(FLTM
26、BV 101-06, substrate per para 5.2,3 mm bondline thickness)3.17.1 As Received Material10 minute oven time at 121 C 1.4 MPaMinimum bake per 5.3.1 2.5 MPaMaximum bake per 5.3.2 2.8 MPa3.17.2 Aged Material(Aged in closed container for 72 hat 40 +/- 1 C)10 minute oven time at 121 C 1.4 MPaMinimum bake pe
27、r 5.3.1 2.5 MPaMaximum bake per 5.3.2 2.8 MPa3.18 TENSILE STRENGTH AND ELONGATION(ASTM D 412, Die C, 3 mm thick)3.18.1 Tensile Strength, min 3.0 MPa10 minute oven time at 121 CMinimum bake per 5.3.1Maximum bake per 5.3.23.18.2 Elongation, min 125 %10 minute oven time at 121 CMinimum bake per 5.3.1Ma
28、ximum bake per 5.3.23.19 TEAR STRENGTH, minimum(ASTM D 624, Die C, 3 mm thick, test at50 mm/min crosshead speed)10 minute oven time at 121 C 7.5 kN/mMinimum bake per 5.3.1 12.0 kN/mMaximum bake per 5.3.2 12.0 kN/m3.20 HARDNESS, DUROMETER A 55 - 75(ASTM D 2240)Test Method:. Apply enough material into
29、 a container (such as an ointment tin)to give a 6 mm thickness slab. Bake material at 135 +/- 1 C for 30 minutes. Condition test sample at 23 +/- 2 C for 4 h, then checkinstantaneous material hardness.The hardness tolerance for any one supplier shall be +/- 5 hardnessuni ts based on the recorded har
30、dness value for their originallyapproved production sample.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G340-AWP 3948-b Page 7 of 93.21 ABRASIVE NoneTest Method:. Dilute a 1 g sample of the material with 1 g of M14J167 specialspirits or equivalent, and mix thoroughly. Rub a portion of the diluted materia
31、l 100 times between 2 piecesof flat, clean plate glass. The appearance of scratches on theglass plate shall be considered failure.3.22 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 stor
32、age conditions, the shelf life of the material shall be 3months. When these mat erials are stored at temperatures below 23 C,they shall be conditioned at room temperature prior to application.Adequ ate conditioning permits the material to obtain its optimumapplication properties.3.23 QUALITYMateria
33、l shall be a smooth homogeneous product free from abrasiveparticles, it shall be consistent in color and t exture, and free fromobjectionable odors dur ing normal storage. It shall be suitable forthe intended application.3.24 FUNCTIONAL APPROVALMaterials being evaluated for approval to this s pecifi
34、cation shall besubject ed to a production trial. Functional trial results must beapproved by the affected assembly operation and Design Engineering.Results shall be made available to Materials Engineering prior tomaterial approval and release.3.25 ADDITIONAL REQUIREMENTSSpecific requirements for mat
35、erial and/or manufa ctured parts shall bespecified on the Engineering drawing, Engineerin g parts specificationand/or performance specifications. All critical areas with respect tothese properties shall be clearly designated on the engineeringdrawing.3.26 SUPPLIERS RESPONSIBILITYAll materials suppli
36、ed to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G340-AWP 3948-b Page 8 of 9Pri or to making any change in the properties, composition,constr uction, color, processing or labeling of t
37、he materialorig inally approved under this specification, whether or not suchchange s affect the materials ability to meet the specificationrequir ements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposed changesand obtain the written app
38、roval of the Materials Engineeringactivity. Test data, t est samples and a new code identification areto be submitted with the request.Substance restrictions imposed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Material Spe
39、cification WS S-M99P9999-A1, unlessa different suffix (e.g., A2 or A3) is specified 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
40、ofthe ir materials shall first obtain an expression of interest from theaffec 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 au
41、thorized representative of the test faci lity, demonstratingful l compliance with all the requirements of this specification (testresults, not nominal values), the material designation a nd code number, andtes t specimens for Ford evaluation. In addition to meeting therequi rements of this specifica
42、tion, the materials will be assessed forsuita bility for intended applications as part of the approval process.Upo n approval, the material will be added to the Engineering MaterialApproved Source List.5. GENERAL INFORMATIONThe information given below is provided for clarification and assistancein m
43、eeting the requirements of this specification.5.1 MECHANICAL CONVECTION OVENThe mechanical oven(s) used 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 SUBSTRATESElectrocoat primed steel panel Prepared per ESB-
44、M2P4 performancespecification. Use current production paints as identified by theBody Engineering Materials Office.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G340-AWP 3948-b Page 9 of 95.3 MATERIAL CURE SCHEDULES5.3.1 Minimum (includes three bakes):First Bake 10 mi nutes at 121 C oven time(pre-gel)Seco
45、nd Bake 8 minu tes at 135 +/- 1 C metaltemperatureThird Bake 8 minu tes at 120 +/- 1 C metaltemperature plus 3 minutes at 130+/- 1 C metal temperature5.3.2 Maximum (includes two bakes:First Bake 10 mi nutes at 121 C oven time(pre-gel)Second Bake 20 minutes at 177 +/- 1 C metaltemperature5.4 COLOR Gray, or as specified by B & AGOPaint Operation Activity5.5 WEIGHT PER VOLUME (Originally Approved) 1.35 kg/L5.6 REPAINT CRACK RESISTANCEOriginally performed in 1/2 pint can lids.
