1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1994 11 02 NB00I10043054375 Released LAG M. TrappWP 3948-a Page 1 of 5 SEALER/GASKET, POLYURETHANE FOAM, WSB-M4G357-AINTEGRAL SKIN1. SCOPEThe material defined by this specification is a moderate ly slow cur
2、ing, twopart, foamed-in-place polyether polyurethane (PUR) foam. This foam isformulated to be free of chloroflourocarbons (CFC).2. APPLICATIONThi s material is intended for use in areas where a water, dust and airbarrie r is required. These applications include, but are not limited to:interior trim,
3、 and HVAC (Heat Ventilation Air Conditioning).There are no requirements for a dhesion of the material to substrate. Thismaterial must be mechanically held in place on the part.Roboti c application of this material would allow for design and use of anint ricate sealing surface that would prove too co
4、st prohibitive usingtraditional, manually applied, adhesive-backed die-cut foam gaskets.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q-101. A mutually acceptable Control Plan as describedtherein is required for material/source appr
5、oval. Appropriatestatist ical tools must be used to analyze process/product data sothat variation in the final product is continuously reduced.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/ortherma l analysis of material/parts suppl
6、ied 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 reference standard when teste
7、dunder the same conditions.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G357-AWP 3948-b Page 2 of 5 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
8、 to testing and tested under thesame conditions unless otherwise specified.3.4 FOAMED TEST SPECIMEN3.4.1 Preparation of Test SpecimensUnless otherwise specified, all tests shall be conducted onsp ecimens taken from foamed test blocks produced under thesame conditions as the part.3.4.2 Density Range
9、0.16 - 0.19 g/cm3(ISO 845/ASTM D 3574-86)3.4.3 Hardness, Durometer A 5 - 10(ISO 48/ASTM D 2240)3.4.4 Tensile Strength, min 137 kPa(ISO R 527, Type 2 specimen,115 x 6 x 2.0 +/- 0.2 mm500 mm/minute test speed/ASTM D 412, die A)3.4.4.1 Elongation at Break, min 72 %Test acc. to para 3.4.4)3.4.5 Tear Str
10、ength, min 420 N/m(ISO 34, Method B, procedure A/ASTM D 624, die C)3.4.6 Compression Set, max 2.7 %(ISO 815, large type-plied specimen/ASTM D 1056, method B)3.4.7 Compression Deflection, min 12 kPa(ISO 3386/a, at 40 % compression/ASTM D 1056)3.4.8 Heat Aging(ISO 188, except 150 +/- 50 airchanges/h,
11、1000 h at 70 +/- 2 C)3.4.8.1 Tensile Strength Change, max +/- 47 %3.4.8.2 Elongation Change, max +/- 8.5 %3.4.8.3 Compression Set Change, max +/- 77 %3.4.8.4 Compression Deflection Change, +/- 61 %maxENGINEERING MATERIAL SPECIFICATIONWSB-M4G357-AWP 3948-b Page 3 of 5 3.4.8.5 Tear Resistance Change,
12、max +/- 8.5 %3.4.8.6 Cold Flexibility (ref 3.8) No evidence ofcracking3.4.8.7 Sealability Testing (ref 3.9) Pass3.5 FLAMMABILITY(ISO 3795/SAE J369)Burn Rate, max 100 mm/minute3.6 FOGGING(FLTM BO 116-03)Fog Number, min 80Formation of clear film or droplets is cause for rejection.3.7 OZONE RESISTANCE,
13、 max 0(FLTM BP 101-01, Procedure A,tensile specimen, at 50 % elongation)3.8 COLD FLEXIBILITY No evidence(ref ESH-M4G278-A) of cracking3.9 SEALABILITY TESTINGThe fol lowing tests are designed to determine the performance of afoamed-in-place gasket in an automotive environment.Sampl e Preparation: A b
14、ead of the foam-in-place gasket materialshall be applied onto a polished plate glass in a U-shapedconfiguration at a foam density representative of end-use criteria.The dimensions of the bead should be 7 mm +/- 1 mm in height and 5 mm+/- 1 mm in width. The dimension of the U-shaped configurationshou
15、ld be 120 mm +/- 2 mm from the horizontal outside edges and 120mm +/- 2 mm from the bottom (outside edge) to the top.The foa med samples are to be conditioned at 25 C +/- 2 C and at arelativ e humidity of 50 % =/- 5 % for at least 16 hours prior totesting.Sample assembly is performed by placing a se
16、cond polished glass plateonto the foam bead sample. Spacers are to be co nstructed to maintaina dista nce between the glass plates of 70 % +/- 2 % of the totalheight of the sample fo am bead. The spacers are to be of a materialthat is dimensionally stable from - 40 C to 150 C. C-clamps can beused to
17、 secure the completed assembly for testing.Testing of Exposed Asse mbly: Sealability of an exposed sample shallbe by the addition of distilled water into the U-shape until theheight is 50 mm +/- 2 mm from the bottom inside edge of the sample.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G357-AWP 3948-b Pa
18、ge 4 of 5 Evaluat ion of Tested Assembly: Samples are required to maintain awater- tight seal for 1 hour. Samples are rated on a Pass, Failbasis.3.9.1 As received Sealability must pass3.9.2 High Temperature sealability must pass(93 C, 24 h)3.9.3 Low Temperature sealability must pass(- 40 C, 24 h)3.9
19、.4 Sealability after environmental cycle must pass3.9.5 Compatability with solvents3.9.5.1 Windshield washer solution must pass3.9.5.2 Car wash solution must pass3.9.5.3 50/50 Isopropyl/water must passSealab ility after Environmental Cycle Test method: Samples areprepared as described in the propose
20、d specifications and exposed tothe following cycles:17 hours Ozone (80 pphm 28 C +/- 2 C)72 hours at 93 C +/- 2 C24 hours salt spray (ref ASTM B 117; 5 % salt solution)7 hours at - 30 C +/- 2 C17 hours at 38 C +/- 2 C and 95 % +/- 3 % R.H.7 hours at 93 C +/- 2 C24 hours at 38 C +/- 2 C and 95 % +/-
21、3 % R.H.Note: Sample assembly is exposed to the above cycle twice.3.10 ADDITIONAL REQUIREMENTSSpecific requirements for material and/or manufa ctured parts shall bespecified on the Engineering drawing, Engineerin g parts specificationand/or performance specification. All critical areas with respect
22、tothese properties shall be clearly designated on the engineeringdrawing.ENGINEERING MATERIAL SPECIFICATIONWSB-M4G357-AWP 3948-b Page 5 of 5 3.11 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasorig
23、inally granted.Pri or to making any change in the 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 not
24、ify Purchasing, Toxicology andthe affected Materials 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, reg
25、ulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Materials Specification WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresp onsible Materials Engineering activity. Supplier
26、s desiring approvalof thei r materials shall first 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
27、by aqualified and authorized representative of the 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 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.
