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. SCOPETh ese specifications define the performance requirements of corro
3、sionprotective materials for temporary storage and shipment of metal parts.2. APPLICATIONWSS-M 21P31-A1: This material forms a soft, clear and oily film whichprovides limited corrosion resistance to metal parts for short terminterior storage. The material s may also have dewatering characteristics.W
4、SS -M21P31-A2: This material forms a soft film which provides moderatecorrosio n protection to stamping parts and vehicle bodies for short terminterior storage and shipment.WSS-M2 1P31-A3: This material provides good corrosion protection to steelparts and assemblies for long term interior storage an
5、d shipment.WSS-M21P 31-A4: This material forms a hard, touch dry film with goodadhesion and excellent corrosio n 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 co
6、nform to Quality SystemRequirements, QS-9000. Material specification r equirements are to beused fo r initial qualification of materials. A Control Plan forong oing production verification is required. This plan must bereviewed and approved b y the relevant Ford Materials activity and/orFor d Suppli
7、er Technical Assistance (STA) prior to production partssubmission. Appropriate statistical tools must be used to analyzepr ocess/product data and assure consistent processing of thematerials.ENGINEERING MATERIAL SPECIFICATIONWSS-M21P31-A1/A2/A3/A4WP 3948-b Page 2 of 4 Part producers using this mater
8、ial 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 its option, may conduct infrared and/ortherma l analysis
9、 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 produce IR spectraand thermograms that correspond to the refer
10、ence 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 than 24 h prior to testing and tested under thesame conditi
11、ons 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 and no staining.3.5 ENVIRONMENTAL CYCLING n.a. 15 cycles
12、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, preferably inthe stores for steelparts.No corrosion and no sta
13、ining.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 time. Asuitable process must be recommended by the supplier
14、.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, electrocoat primer or adhesive bonding.3.10 SUPPLIERS RESP
15、ONSIBILITYAll 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, processing or labeling of the materialorig inally approved under
16、 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 approval of the Materials Engineeringact
17、ivity. 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 Materials Specification WSS-M99P9999-A1.4. APPROV
18、AL 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 Purchasing, Design and Materials Engineering activity. Upo
19、nrequest, 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 all the requirements of this specification (testresults, n
20、ot 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 intended processes and/or applications. Uponapprov al, the mat
21、erial 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 meeting 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.
