1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1990 03 12 NB00E10039338000 Released E. Rezendes MPWP 3948-a Page 1 of 6 SEALER, REPAIR - CHIP RESISTANT - SPRAYABLE ESB-M4G317-ATOPCOAT OVEN BAKE CYCLE1. SCOPEThe material defined by this specification is a poly
2、vinylchloride-basedspr ayable repair coating for the ESB-M4G276 lower bodyside stone chipresistant coating. This coating can be cured by the ena mel oven bake cycleand p rovides a paintable corrosion resistant film which will withstandstone chipping.2. APPLICATIONThis specification was released orig
3、inally for a sprayable material, to beused to repair ESB-M4G276. It is a total panel repair material; it is notfor spot repair usage.3. REQUIREMENTSThe material shall meet all requirements detailed in thi s section. Approvedproduction material applied and tested under identical conditions shall beus
4、ed as the control. In the ev ent that both the sample under test and thecontrol material fail any requirements, that test shall be repeated. Thesere quirements apply to both laboratory-prepared and production batches ofthe coating.3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of
5、 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 product is continuously reduced.3.2 INFRARED SPECTROPHOTOMETR
6、Y 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 reference standard and shall be kept on file at thedesignate
7、d material laboratory. All samples sha ll produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.ENGINEERING MATERIAL SPECIFICATIONESB-M4G317-AWP 3948-b Page 2 of 6 3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are base
8、d 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 SOLIDS, min 95 %(ASTM D 2834, except heat for 3 h at 102+/- 3 C in a mechanical convection ov
9、en)3.5 PHYSICAL PROPERTIES3.5.1 Weight Per Volume 1.42 +/- .03 kg/L(ASTM D 816)3.5.2 Viscosity(FLTM BV 103-01, 1.32 mm orifice,280 kPa air pressure)3.5.2.1 As Received 7 - 25 s3.5.2.2 Aged, max 50 s(72 h at 38 +/- 2 C)3.5.3 Cured Sealant Properties3.5.3.1 Tensile, min 1.9 MPa(ASTM D 412, Die C,300 m
10、m/minute)For sample preparation see para 3.5.3.4.3.5.3.2 Elongation at Tensile Break,Break, min 50 %3.5.3.3 Tear Strength, min 7 kN/m(ASTM D 624, Die C,500 mm/minute)For sample preparation see para 3.5.3.4.ENGINEERING MATERIAL SPECIFICATIONESB-M4G317-AWP 3948-b Page 3 of 6 3.5.3.4 Cured Sealant Samp
11、le Preparationand Aging RequirementsCure a sealant slab 1 50 x 150 x 0.38 +/- 0.5 mm ina mechanical convecti on oven for 10 minutes at 130+/- 2 C (metal temperature). Die cut samples fortensile, elongation and tear taking care to avoidserious air inclusion or thin areas in the controlsections. Test
12、the sealer after: (1) aging 72 hoursat 23 C and (2) aging 2 weeks at 70 +/- 1 C.3.6 PREPARATION OF TEST PANELSPrepar e test panels for paragraphs 3.7 and 3.8.2 as described below:. Electr ocoat: Ford PTQ cold rolled steel and ESB-M1A62 galvanizedsteel. Pre-treatment: ESB-M3P1 zinc phosphate. Electr
13、ocoat: ESB-M64J26 medium build cathodic electrocoat primer,20 - 23 micrometres followed by the specified bake cycle. Apply the 0.38 mm dry film thic kness of repair sealer and bake for17 minutes at 130 C oven conditions. After the panels cool to room t emperature, apply ESB-M33J100 whiteena mel, bla
14、ck enamel and ESB-M33J3 light blue metallic basecoat/clearcoat. Bake the panels for 17 minutes at 130 C oven conditions. Age panels 72 h room temperature or 16 h at 43 +/- 2 C oventemperature before initiating a test program.3.7 APPEARANCE3.7.1 SmoothnessThe repair sealer film shall level to a moder
15、ate degree oforange peel. The surface of th e material under test shall beequal to or better than current approved production materialfor smoothness when applied and baked under identicalconditions.ENGINEERING MATERIAL SPECIFICATIONESB-M4G317-AWP 3948-b Page 4 of 6 3.7.2 HoldoutThere shall be no evi
16、dence of dulling or strike-in when enamelcolor coat is applied over the repair sealer, and nodifference in gloss of the color coat. This evaluation shouldbe mad e on 3 panels: one painted with white enamel, anotherpainted with black enamel, and a third painted with ligh t bluebasecoat/clearcoat.3.7.
17、3 PaintabilityInitial AppearanceNo significant color shift, difference in orientation ofmeta llic flakes (metallic paints) or other objectionableappearance defects in the paint over the sealer. Evaluat e overlight blue metallic topcoat.3.7.4 WeatherabilityNo sta ining, discoloration or other deleter
18、ious effect onwhite and colored topcoats as a result of weatherometer andFlorida exposure.Test Methods:. Prepare white, black and light blue metallic enamel ovenrepair. Expose 1 set of 3 panels for a minimum of 530 kJ/m2according to SAE J1960. Expose 1 set of 3 panels for 12 months at an angle of 90
19、deg facing south in the Miami, Florida area.3.8 APPLICATION AND RESISTANCE PROPERTIES3.8.1 Sag, max 1.5 mmTest Method:. Apply 25 x 200 x 1.2 mm ribbon on an electrocoated 100 x300 x 0.9 mm CRS panel. Permit the panel to air dry for 30 minutes at 23 +/- 2 Cin a vertical attitude with the 200 mm dimen
20、sion of theribbon vertical. Bake the panel for 17 minutes at 130 +/- 3 C in amec hanical convection oven. The panel is to be held in aver tical attitude with the 200 mm dimension of the ribbonvertical. Allow the panels to cool to 23 +/- 2 C and measure th e sag.ENGINEERING MATERIAL SPECIFICATIONESB-
21、M4G317-AWP 3948-b Page 5 of 6 3.8.2 Abrasion, Adhesion and Corrosion Resistance(FLTM BV 2-2, Table III)The coating shall protect body substrates from stone abrasionwhen subjected to 4.7 L of grav el per SAE J400, and corrosionafter ex posure to 1000 h salt spray per ASTM B 117. Thereshall be 100 % c
22、oating retention to all substrates after theabrasion test with no corrosion extending more than 3.0 mmfrom scribed or abraded areas a fter salt spray exposure. Usewhite enamel only for this test.Acce ptable sealer adhesion requires a minimum 440 N/m peelstrength or 100 % cohesive failure.3.8.3 Abras
23、ivesShall be such that it will not cause premature failure of thepumping equipment, the spray guns or the spray tips due to thepresence of abrasive fillers, etc.Test Method: Dilute a 1 g samp le of the material with 1 g ofM-14J167 Special Spirits and mi x thoroughly. Rub a portion ofthe dilu ted mat
24、erial 100 times between two pieces of flat,clean plate glass. The appearance of scratches on the glassplate shall be considered failure.3.8.4 SprayabilityShal l be suitable for use in the airless spray equipmentdesignated by the Process Engineering Department.3.8.5 Heat StabilityNo e vidence of blis
25、tering, cracking, charring, loss ofadhesi on or embrittlement when exposed to high temperatures.Test Method: Prepare test panels per para 3.6 except ba ke the0.38 mm dry film thickness of r epair sealer for 30 minutes at163 C metal temperature.3.8.6 Storage StabilityShall be stored at ambient room t
26、emperature below 38 C, awayfrom all sources of heat. Heat greatly accelerates aging.Under these storage conditions, the minimum shelf life of themateri al shall be 2 months. When this material is stored attemp eratures below 23 C, it shall be conditioned at roomtemp erature prior to application. Ade
27、quate conditioningperm its the material to obtain its maximum applicationproperties.ENGINEERING MATERIAL SPECIFICATIONESB-M4G317-AWP 3948-b Page 6 of 6 3.8.7 QualityShall be a smooth homogeneous mixture, free from foreignmat erials and properties detrimental to normal productionoperations.3.9 ADDITI
28、ONAL REQUIREMENTSSpe cific requirements for physical properties of molded or extrudedparts shall be specified on the engineering drawing and/ or engineeringpart sp ecification. All critical areas with respect to theseproperties shall be clearly designated on the engineering drawing.3.10 SUPPLIERS RE
29、SPONSIBILITYAll materials supplied 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 und
30、er this specificati on, whether 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 a
31、ctivity. Test data,test sam ples 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, unless
32、a differ ent suffix (e.g., A2 or A3) is specified on the engineeringdocument for the application.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 obta
33、in an expression of interest from theaffecte d Purchasing, Design and Materials Engineering 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 c
34、ode number, and testspecimen s for Ford evaluation. Upon approval, the material will be addedto the Engineering Material Approved Source List.5. GENERAL INFORMATIONTh e information below is provided for clarification and assistance inmeeting the requirements to the specification.5.1 COLOR White or asspecif ied in thePaint Manual
