1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1995 08 23 Activated D. Henrickson LAGWP 3948-a Page 1 of 4 DAMPER, VISCOELASTIC LAYER, HEAT EXPANDING WSS-M5G63-A1. SCOPEThe mat erial defined by this specification is a viscoelastic-based,expand able vibration
2、damping material for use with stamped sheet metal asa constraining layer.2. APPLICATIONThis specification was released originally for material used between adouble sheet metal panel to pro vide improved sound damping, stiffness, andred uced sound transmission. A 1.0 mm thick sheet of unexpandedvisco
3、e lastic material is attached to the inner panel before the inner andouter pane ls are spot welded together. After welding, when the vehiclebody passes through assembly pl ant E-coat cure ovens, the material expandsfilling the design gap to provide a “constrained layer“ damped system.3. REQUIREMENTS
4、3.1 QUALITY SYSTEM REQUIREMENTSMaterial suppliers and part producers must conform 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 berevie
5、wed and approved b y the relevant Ford Materials activity and/orFor d Supplier Technical Assistance (STA) prior to production partssubmission. Appropriate statistical tools must be used to analyzepr ocess/product data and assure consistent processing of thematerials.Part producers using this materia
6、l 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 o
7、f 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 referen
8、ce standard when testedunder the same conditions.ENGINEERING MATERIAL SPECIFICATIONWSS-M5G63-AWP 3948-b Page 2 of 4 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
9、 less than 24 h prior to testing and tested under thesame conditions unless otherwise specified.3.4 UNCURED MATERIAL PROPERTIES3.4.1 Thickness As specified on(ASTM D 461, 454 g load, engineering drawing25 mm diameter foot)3.4.2 Specific Gravity 1.45 +/- 10 %3.4.3 Ash Content, max 65 %(ASTM D 297)3.4
10、.4 Hardness, Durometer “A“ 55 - 75(ASTM D 2240)3.4.5 Flexibility No crackingTest Method: Bend 50 x 25 x 1 mm sample 180 deg rees by hand.3.4.6 Tear Strength, min 10 kN/m(ASTM D 624, Die “C“)3.4.7 Solids, min 98 %(ASTM D 2834, except heat ina mechanical convection ovenat 100 +/- 3 C for 3 h)3.5 CURED
11、 MATERIAL PROPERTIES3.5.1 Damping Loss Factor, min(Average of first mode on eitherside of 200 Hz)10 minutes/180 C 30 minutes/205 C0 C 0.04 0.0315 C 0.16 0.1323 C 0.20 0.1830 C 0.20 0.2045 C 0.18 0.2560 C 0.15 0.1782 C 0.07 0.06Test Method: ASTM E 756 with the following parameters:. Test bars to be 3
12、00 x 20 x 0.76 mm. Constrained layer thickness to be 0.76 mm. Final bond thickness to be 1.5 mm. Bake material at specified metal temperatures for timesgivenENGINEERING MATERIAL SPECIFICATIONWSS-M5G63-AWP 3948-b Page 3 of 4 3.5.2 Volume Expansion, min(FLTM BV 108-02)10 minutes at 180 +/- 2 C 120 %30
13、 minutes at 205 +/- 2 C 120 %3.5.3 Water Absorption, max(FLTM BV 117-01)10 minutes at 180 +/- 2 C 5.0 %30 minutes at 205 +/- 2 C 5.0 %3.5.4 Sandwich Panel Adhesion Cohesive failure(1.0 mm material, 1.5 mmfinal bond thickness)Material shall be compl etely bonded to both panels and shallprovide good a
14、dhesion w hen cured for 10 minutes at 180 +/- 2C and for 30 minutes at 205 +/- 2 C. If the panel can bepried apart, only cohes ive failure of the bond is acceptable(i .e., the material shall rip internally leaving materialcompletely attached to both panel surfaces). There shall beno evidence of mate
15、rial collapse or other materialdegradation.3.5.5 FOGGING(FLTM BO 116-03, 3 h at 100 C)Fog Number, min 60Fo rmation of excessive amounts of clear film, droplets, orcrystals is cause for rejection.3.5.6 Odor, max Rating 2(SAE J 1351)ENGINEERING MATERIAL SPECIFICATIONWSS-M5G63-AWP 3948-b Page 4 of 4 3.
16、6 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, processing or labeling of the materialorig inall
17、y 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 obtain the written approval of the Material
18、s 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 Engineering Materials Specification WSS-M99P9
19、999-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 first obtain an expression of interest from theaffec ted Purchasing, Design and Materials Engineeri
20、ng 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 all the requirements of this specification
21、 (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 intended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.
