1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1993 12 10 C10352495 Released D.G. GreenWP 3948-a Page 1 of 4 REPAIR PRIMER FILLER, TWO PACK, AIR DRYING WSK-M6J172-A11. SCOPEThe mate rial defined by this specification is an acrylic based componentforming
2、 part of a two pack airdrying or forced drying refinishing primersystem . It is to be used in combination with the appropriate hardener inthe ratio suggested by the supplier.2. APPLICATIONThis speci fication was released originally for a material to be used inconjunction with the designated hardener
3、 component as a priming system forsand-through areas on exterior automotive body surfaces.The prim er is applied directly over the substrate following damage andsand-through. The primed surfac e may then be lightly sanded and overcoatedwi th either acid catalysed body stoving enamel or an approved t
4、wo packrepair e namel system depending on the particular stage in the paintingprocess in which the damage has been sustained in.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q-101. A mutually acceptable Control Plan as describedther
5、ein is required for material/source approval. Appropriatestatist ical tools must be used to analyze process/product data sothat variation in the final product is continually reduced.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company in its option, may conduct in frared and/or t
6、hermalana lysis of materials/parts supplied to this specification. The IRspectra and thermograms established for initial 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 correspo
7、nd to the reference standard when testedunder the same conditions.3.3 CONDITIONING Test panels with stoved paint systems shall be aged for 72 h at 23+/- 2 C or 16 h at 43 +/- 2 C before testing for resistanceproperties unless otherwise specified.ENGINEERING MATERIAL SPECIFICATIONWSK-M6J172-A1WP 3948
8、-b Page 2 of 4 Test pa nels with completely air drying paint systems shall be agedfor 7 days at 23 +/- 2 C or 36 h at 43 +/- 2 C before testing forresistance properties unless otherwise specified.Al l tests according to this specification shall be performed in acontrolled atmosphere of 23 +/- 2 C an
9、d 50 - 65 % relative humidityif not otherwise specified.3.4 COMPOSITION3.4.1 Resin Ac rylic or alternative syntheticresin with similar properties3.4.2 Pigments/Extenders Pi gments and extenders to obtainthe desired colour and sandingproperties3.4.3 Solvent Emmisions Initial Sample +/- 1 %(ASTM D 396
10、0)This r equirement is as determined by the United StatesEnvironmental Protection Agency Method #24 and is onlyapplicable to materials used in the USA.3.5 MATERIAL PROPERTIES3.5.1 Non-volatile Initial Sample +/- 1 %(FLTM BI 102-01)3.5.2 Density Initial Sample +/- 0.02 g/mL(ASTM D1475)3.5.3 Viscosity
11、 as Initial Sample +/- 5 s Ford 4 Cupsupplied at 25 C(FLTM BI 111-01)3.5.4 Spraying Viscosity As specified by the supplier(FLTM BI 111-01)3.5.5 Mixing Ratio As specified by the supplier3.5.6 Dry Hiding Power, max 20 micrometre(FLTM BI 158-01)3.5.7 Storage Stability 90 daysDuri ng a storage of 90 day
12、s between 5 and 32 C temperaturethe material shall not settle up or cake.3.5.8 Flash Point(ASTM D 56)The f lash point shall conform to the safety regulationsapp licable to the plant and/or country where the materialshall be used.ENGINEERING MATERIAL SPECIFICATIONWSK-M6J172-A1WP 3948-b Page 3 of 4 3.
13、8 PREPARATION OF TEST PANELS3.8.1 FLTM BI 103-02Prepare standard painte d test panels in accordance with testmethod ie, phosphated t est panels, UMA 18004 or 18005 coatedwith current body painting system; cathodic electrocoat,primer surfacer, and topcoat enamel.3.8.2 Spot Repair SimulationRub th rou
14、gh the standard paint system 3.8.1 to bare steelusing the “feathering technique“ with the approp riate wet/drysand p aper. Clean the created spot-repair area with anappropriate degreasing solvent, then allow to dry and “tackoff“.Mix the hardener and primer in the recomended ra tio and applythree coa
15、ts of the two pack primer system, 25 - 35micrometres.Enamels containing acid catalyst. Bake 10 minutes at 100 Cmetal temperature.3.9 FILM AND RESISTANCE PROPERTIES3.9.1 Adhesion No chipping(FLTM BI 106-1 Method B, Cross Hatch) Grade 03.9.2 Stone Chipping, max Chipping, (FLTM BI 157-04) Rating 53.9.3
16、 Water Immersion, 240 h No blistering(FLTM BI 104-01)3.9.4 Salt Spray Exposure, 240 h(FLTM BI 103-01)Up to a maximum of 4 mm corrosion creep, blistering, and/orloss of adhesion from a line scribed through to bare metal.3.10 PAINT COMPATABILITYPri or to making any changes in properties and/or composi
17、tion ofori ginally approved paint, the supplier must certify compliance toall requirements of direct glazing system specif ication (test values,not nominal values) and obtain approval from the responsibleMaterials Engineering activity. For approved direct glazing dystemcontact the responsible Materi
18、als Engineering activity.3.11 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.ENGINEERING MATERIAL SPECIFICATIONWSK-M6J172-A1WP 3948-b Page 4 of 4 Pri or to making any change in t
19、he 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 ements, the Supplier shall notify Purchasing, Toxicology andthe affected Mate
20、rials 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.Substance restrictions imposed by law, regulations or Ford, apply tothe materials address
21、ed by this document. The restrictions aredefined in Engineering Material Specification WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresp onsible Materials Engineering activity. Suppliers desiring approvalof thei r materials shall fir
22、st 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 authorized representative of t
23、he 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. Fords engineering approval of amateri al will be based on its performance to this spe
24、cification and on anassessment of suitability for i ntended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.5. GENERAL INFORMATIONThe information below is provided for clarification and assistance inmeeting the requirements of the specification.5.1 Density of Dry Film Applied See Initial Sample(FLTM BI 154-02) +/- 0.02 kg/L
