1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1994 04 01 NB00E10328102000 Released D. DiGregorio E. RezendesWP 3948-a Page 1 of 7 SEALER, TAPE FORM, LOW EXPANSION, WELDABLE, EPDM WSB-M4G267-A4BASE (TACKY SIDE) AND EVA FILM (NON-TACKY SIDE)SEALER, TAPE
2、FORM, LOW EXPANSION, WELDABLE, EPDM WSB-M4G267-A5BASE, TACKY BOTH SIDES1. SCOPEWSB-M4 G267-A4: The material defined by this specification is an extrudedtape form , heat expanding EPDM base sealer for use in areas where lowexpans ion is required. It incorporates an ethylene vinyl acetate film onone s
3、ide to facilitate application of the sealer to the sheet metal.WSB-M4 G267-A5: The material defined by this specification is an extrudedtape form , heat expanding EPDM base sealer for use in areas where lowexpansion is required. It is tacky on both sides.2. APPLICATIONThese specifications were relea
4、sed originally for materi al used in the bodyshop for sealing weld joints and openings where welding is not arequirem ent. The materials have good adhesion to CRLC andelectr ogalvanized steel substrates. The materials expand during theprocess bake schedules noted in para 5.3.3. REQUIREMENTS3.1 STATI
5、STICAL 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 p
6、roduct is continuously reduced.3.2 INFRARED SPECTROPHOTOMETRY AND/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
7、reference standard and shall be kept on file at thedesignated material laboratory. All samples sha ll produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G267-A4/A5WP 3948-b Page 2 of 7 3.3 CONDITION
8、ING AND TEST CONDITIONSAll test values indicated herein are based 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 DIMENSIONSAs specified on the
9、 engineering Drawing and/or Weld Sealer Manual.3.5 CONSISTENCY 8 - 12 mm(ASTM D 5, 150 g total weight)Initial and After Material Aged72 h at 45 +/- 2 C3.6 SOLDS, min 95 %(ASTM D 2834, except heat at 102 +/- 2 Cfor 3 h in a mechanical convection oven)3.7 SPECIFIC GRAVITY 1.2 +/- 0.25(ASTM D 297, hydr
10、ostatic method)3.8 VOLUME EXPANSION(FLTM BV 108-02)3.8.1 At 170 C 15 - 60 %3.8.2 At 205 C 15 - 60 %3.9 WATER ABSORPTION, max(FLTM BV 117-01)3.8.1 Method A Less than 2 %3.8.2 Method B Less than 2 %3.10 BRIDGING, max 2.0 mm(SAE J243, ADS-9, Method D, non-flow)Test Method:. Condition 2 test fixtures wi
11、th 150 mm material strips for 1 h at23 +/ - 2 C. Bake 1 test fixture at each material cure schedulespecified in para 5.3. Measure the amount of material sag through the holes.3.11 SAG RESISTANCE, max 3 mm(FLTM BV 118-01, substrate per para 5.2,material cure schedules per para 5.3)ENGINEERING MATERIA
12、L SPECIFICATIONWSB-M4G267-A4/A5WP 3948-b Page 3 of 7 3.12 ADHESION CHARACTERISTICSTest M ethod: Apply two 200 mm length ribbons of material to each oftwo 0.9 x 100 x 300 mm steel pa nels per para 5.2 and condition panelsat 23 C +/- 2 C for 1 h. Bake one panel at each material curesche dule per para
13、5.3. Position panels in a horizontal attitudeduring material bake. After ba ke, condition panels at 23 +/- 2 C for4 h mi n. Evaluate adhesion by inserting the tip of a sharp spatulaunde r the end of the material strip. Grasp the tab of sealer andattempt to peel at 180 deg.The material shall not be r
14、emovable in a continuous coherent film.Observe for any indication that the material fails to adhere to thesubstrate or is brittle or friable.3.13 LOW TEMPERATURE RESISTANCE No cracking or adhesion failureTest method: Prepare two 0.9 x 100 x 300 mm test panels per para3.12. Condition the panels in a
15、mechanical convection oven at 70 +/-2 C for 7 days . Condition the samples at 23 +/- 2 C for 1 hour.Place t he panels in the slamming apparatus (FLTM BV 101-02) at - 30+/- 2 C for 4 hours. Slam each panel a total of 10 times.3.14 RESISTANCE TO CORROSION 500 h(ASTM B 117)No los s of adhesion or blist
16、ering of the material and no evidence ofcorrosion on the metal surface when subjected to salt spray.Test M ethod: Apply a 150 mm length strip of material at the edge oftwo 0.9 x 75 x 150 mm oily steel panels per para 5.2. Sandwich themateri al with another steel panel as shown in drawing below and w
17、eldat i ntervals indicated. Cure two samples at each of the bakeschedules indicated in para 5.3.Subject th e cured assemblies to 500 h salt spray per ASTM B 117.After expo sure, condition assemblies at 23 +/- 2 C for 24 h min.Disassemble panels and examine metal surface under seale r for evidenceof
18、corrosion.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G267-A4/A5WP 3948-b Page 4 of 7 3.15 WATER TIGHTNESS No lea ks visible through sealer orbe tween sealer substrate surfacewithin 2 hTest M ethod: Use two 75 x 150 mm CRS steel panels. Form one of thepanels into the configuration s hown below. Place a
19、12 x 150 x 1.5 mmstrip of material on the 15 mm area of the formed panel. Weld thispanel to the flat panel placing one weld at each end (12 mm from theedge). Immerse the entire fixture into a 50 degree C constanttemper ature water bath for 20 minutes. Remove from bath and bake atmaterial cure schedu
20、les per para 5.3. The fixture should remain inan uprigh t position (i.e. funnel end up) during the baking process.After bake, condition at 23 +/- 1 C for 1 h. Seal each end of thefunnel end of the fixture to form a trough. Place fixture in a visegrip, trough side up. Fill the trough with water at 23
21、 +/- 1 C. Aima 5 mm diameter air nozzle set at 0.2 MPa line pressure into bottomof fix ture and make lengthwise passes along bondline for 30 seconds.Hold ai r nozzle approximately 25 mm from bottom of fixture. No airshould pass through sealer mate rial. Allow fixture to sit for 1 hourat 23 +/- 1 C w
22、hile watching for water leaks at bottom of fixture.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G267-A4/A5WP 3948-b Page 5 of 7 3.16 ELECTROCOAT COMPATIBILITY(FLTM BV 119-01)Shal l not contaminate electrocoat primer bath or cause electrocoatfilm irregularities.3.17 WELD ACCEPTANCE TEST Shall be weldable(
23、FLTM BV 109-02)3.18 FLAMMABILITY WITH CONTINUOUS Less than 5 % of the welds shallSPOT WELDING exhibit flame and shall be(FLTM BV 114-01) self-extinguishing within 30 s3.19 FOGGING(FLTM BO 116-03)Fog Number, min 60The form ation of droplets or coalescence into a clear film is causefor rejection.3.20
24、UNCURED ADHESION AND RELEASE PAPER REMOVALThe sealer shall be adhesive when hand applied to oily s teel surfaces.The mater ial shall be capable of having the release paper backingremoved without distorting the shape of the sealer.3.21 PACKAGINGThe material shall be supplied in sealed packages and ma
25、terialblocking is not permitted during container shipping or storage.3.22 STORAGE STABILITYShall be stored below 40 C away from all sources of heat and sunlight.Under these storage conditions, the shelf life of the material shallbe 3 mon ths. When these materials are stored at temperatures below23 C
26、, they shall be conditioned at room temperature prior toapplication. Adequate conditioning permits the material to obtain itsoptimum application properties. 3.23 FUNCTIONAL APPROVALMaterials being evaluated for a pproval to this specification shall besubj ected to a production trial. Functional tria
27、l results must beapp roved by the affected assembly operation and Design Engineering.Result s shall be made available to Materials Engineering prior tomaterial approval and release.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G267-A4/A5WP 3948-b Page 6 of 7 3.24 SUPPLIERS RESPONSIBILITYAll materials supp
28、lied to this specification must be equ ivalent in allchar acteristics to the material upon which approval was originallygranted.Prio r to making any change in the properties, composition,construction, color, processing or labeling of the mater ial originallyapproved under this specificati on, whethe
29、r or not such changes affectthe materials ability to meet the specification requirements, theSupplier shall notify Purchasing, Toxicology and the affectedMaterials Engineering activity of the proposed changes and obtain thewritten approval of the Materials Engineering activity. Test data,test sam pl
30、es and a new code identification are to be submitted withthe request.Substa nce restrictions imposed by law, regulations or Ford, apply toth e materials addressed by this document. The restrictions aredefined in Engineering Material Specification WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMaterials def
31、ined 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 Engineering activity. Uponrequest, the Supplier shall
32、submit to the affected Materials Engineeringact ivity a completed copy of their laboratory test reports, signed by aqualified and authorized repres entative of the test facility, demonstratingfu ll compliance with all the requirements of this specification (testresults, not nominal values), t he mat
33、erial designation and code number, andtest spec imens for Ford evaluation. Fords engineering approval of amateria l will be based on its performance to this specification and on anassess ment of suitability for intended processes and/or applications. Uponapproval, the material will be added to the E
34、ngineering Material ApprovedSource List.5. GENERAL INFORMATIONTh e information below is provided for clarification and assistance inmeeting the requirements of this specification.5.1 MECHANICAL CONVECTION OVENThe me chanical convection oven(s) used to cure the material shall becapable of achieving 2
35、05 C metal temperature on body steel (0.9 mmthickness) within 8 - 10 minutes.5.2 SUBSTRATES5.2.1 CRLC s teel meeting WSB-M1A250-A1: Nominal 0.8 mm thickness,surface precoated with a 0.013 mm wet film of stampinglubricant as specified by the responsible Material Engin eeringActivity.ENGINEERING MATER
36、IAL SPECIFICATIONWSB-M4G267-A4/A5WP 3948-b Page 7 of 7 5.2.2 Galvanized steel meeting WSB-M1A250-C3-60G60G-EL: Nomin al 0.8mm thickn ess, surface precoated with a 0.013 mm wet film ofstamp ing lubricant as specified by the responsible MaterialEngineering Activity.5.3 MATERIAL BAKE SCHEDULES5.3.1 Minimum: 170 C for 10 minutes metal temperature(20 minutes oven time, max)5.3.2 Maximum: 205 C for 30 minutes metal temperature(40 minutes oven time, min)
