1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1996 08 28 Activated K. WoltersWP 3948-a Page 1 of 4 PERFORMANCE, CORROSION PROTECTION, TEMPORARY, WSS-M21P31-A1SHORT TERM, INTERIOR STORAGEPERFORMANCE, CORROSION PROTECTION, TEMPORARY, WSS-M21P31-A2SHORT TERM, I
2、NTERIOR STORAGE AND SHIPMENTPERFORMANCE, CORROSION PROTECTION, TEMPORARY, WSS-M21P31-A3LONG TERM, INTERIOR STORAGE AND SHIPMENTPERFORMANCE, CORROSION PROTECTION, TEMPORARY, WSS-M21P31-A4LONG TERM, EXTERIOR STORAGE AND SHIPMENT1. SCOPEThese specifications define the performance requirements of corros
3、ionprotective materials for temporary storage and shipment of metal parts.2. APPLICATIONWSS-M21P31-A1: This material forms a soft, clear and oily film whichprovides limited corrosion resistance to metal parts for short terminterior storage. The materials may also have dewatering characteristics.WSS-
4、M21P31-A2: This material forms a soft film which provides moderatecorrosion protection to stamping parts and vehicle bodies for short terminterior storage and shipment.WSS-M21P31-A3: This material provides good corrosion protection to steelparts and assemblies for long term interior storage and ship
5、ment.WSS-M21P31-A4: This material forms a hard, touch dry film with goodadhesion and excellent corrosion protection to steel parts and assemblies.It is used for long term exterior storage and shipment.3. REQUIREMENTS3.1 QUALITY SYSTEM REQUIREMENTSMaterial suppliers and part producers must conform to
6、 Quality SystemRequirements, QS-9000. Material specification requirements are to beused for initial qualification of materials. A Control Plan forongoing production verification is required. This plan must bereviewed and approved by the relevant Ford Materials activity and/orFord Supplier Technical
7、Assistance (STA) prior to production partssubmission. Appropriate statistical tools must be used to analyzeprocess/product data and assure consistent processing of thematerials.NOT TO BE USED FOR NEW DESIGN2015 N Status No longer used G. Weber, NAENGINEERING MATERIAL SPECIFICATIONWSS-M21P31-A1/A2/A3
8、/A4WP 3948-b Page 2 of 4 Part producers using this material in their products, must use Fordapproved materials and must conform to a process control plan whichhas been approved by STA and/or the relevant Materials Activity.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at
9、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 thedesignated material laboratory. All samples sha ll produc
10、e 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 ma terial conditioned ina control led atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for not less tha
11、n 24 h prior to testing and tested under thesame conditions unless otherwise specified.WSS-M21P31 WSS-M21P31 WSS-M21P31 WSS-M21P3 1-A1 -A2 -A3 -A4 3.4 HUMIDITY RESISTANCE 30 days 60 days 80 days n.a.(FLTM BJ 107-03, 40 +/-2 C, 98 +/- 2 % r.h.;any applicable humiditycabinet may be used)No corrosion a
12、nd no staining.3.5 ENVIRONMENTAL CYCLING n.a. 15 cycles 20 cycles 20 cycles(DIN 50017, SFW, orequivalent)No corrosion and no staining.3.6 CORROSION RESISTANCE 2 months 4 months 6 months 12 monthsInterior Interior Interior ExteriorTest panels shall beexposed to theatmosphere at selectedplaces, prefer
13、ably inthe stores for steelparts.No corrosion and no staining.3.7 SALT SPRAY RESISTANCE n.a. n.a. n.a. 720 hours(ASTM B 117)No corrosion and nostaining.ENGINEERING MATERIAL SPECIFICATIONWSS-M21P31-A1/A2/A3/A4WP 3948-b Page 3 of 4 3.8 REMOVALThe rust preventive must be completely removable at any tim
14、e. Asuitable process must be recommended by the supplier.3.9 COMPATIBILITYThe m aterial must be compatible with all following process steps(cleaning operations, phosphating process, adhesive and sealerapplication, welding op erations, etc.) and shall not deteriorate theperformance of phosphating, el
15、ectrocoat primer or adhesive bonding.3.10 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.Pri or to making any change in the properties, composition,constr uction, color, processi
16、ng 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 Materials Engineering activity of the proposed changesand obt
17、ain 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 addressed by this document. The restrictions aredefined in Engin
18、eering Materials Specification WSS-M99P9999-A1.4. 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 ted Pu
19、rchasing, 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 the test faci lity, demonstratingful l compliance with al
20、l 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 specification and on anassessment of suitability for intend
21、ed processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.ENGINEERING MATERIAL SPECIFICATIONWSS-M21P31-A1/A2/A3/A4WP 3948-b Page 4 of 4 5. GENERAL INFORMATIONThe information given below is provided for clarification and assistancein m
22、eeting the requirements of this specification.5.1 MATERIAL REFERENCEAll re lated materials used for approval of corrosion preventivematerial according to t his specification, e.g. substrate, cleaner orphosphating materials, etc. as well as applicati on and test parameterand location shall be noted in the Initial Sample Report of thecorrosion protective.
