1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1995 07 14 Activated R. GordonWP 3948-a Page 1 of 5SEALANT, SILICONE RUBBER, ONE COMPONENT WSF-M4G353-A1- METHOXY CURED, BLACKSEALANT, SILICONE RUBBER, ONE COMPONENT WSS-M4G353-A2- METHOXY CURED, BLUESEALANT, SIL
2、ICONE RUBBER, ONE COMPONENT WSS-M4G353-A3- METHOXY CURED, WHITE1. SCOPEThe materials defined by these specifications are one component,moisture-cured silicone rubber sealants. Vapors given off during cureare non-acidic and non-corrosive to copper.2. APPLICATIONThis specification was released origina
3、lly to define materials used toseal aluminum housings for electronic applications. The sealants arecapable of being pumped, metered and distributed into gasket profile.3. REQUIREMENTS3.1 QUALITY SYSTEM REQUIREMENTSMaterial suppliers and part producers must conform to QualitySystem Requirements, QS-9
4、000. Material specification requirementsare to be used for initial qualification of materials. A ControlPlan for ongoing production verification is required. This planmust be reviewed and approved by the relevant Ford Materialsactivity and/or Ford Supplier Technical Assistance (STA) prior toproducti
5、on parts submission. Appropriate statistical tools must beused to analyze process/product data and assure consistentprocessing of the materials.Part producers using this material in their products, must use Fordapproved materials and must conform to a process control plan whichhas been approved by S
6、TA and/or the relevant Materials Activity.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/orthermal analysis of material/parts supplied to this specification.The IR spectra and thermograms established for initial approvalshall constit
7、ute the reference standard and shall be kept on fileat the designated material laboratory. All samples shall produce IRspectra and thermograms that correspond to the reference standardwhen tested under the same conditions.ENGINEERING MATERIAL SPECIFICATIONWSF-M4G353-A1WSS-M4G353-A2WSS-M4G353-A3WP 39
8、48-b Page 2 of 53.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on material conditionedin a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for not less than 24 h prior to testing and tested underthe same conditions unless otherwise specified.3.4 UN
9、CURED SEALANT PROPERTIESA1 A2 A33.4.1 COLOR Black Blue White3.4.2 Specific 1.32-1.38 1.01-1.07 1.01-1.07Gravity,range(ASTM D 792,Method A)3.4.3 Extrusion 375 - 425 140 - 260 140 - 260Rate, sTest Method:Time to disperse 50 cc through a stainless steel nozzlewith a 3.2 +/- 0.13 mm orifice and 50 +/- 0
10、.13 mm in lengthat 448 kPa pressure using a # 250 Semco gun and 170 g PEcartridge assembly. Start the test by dispensingapproximately 10 cc and then timing the next 50 cc.3.4.4 Cure Pass Pass PassRateTest Method:Apply a 3.18 mm diameter bead of sealer to a steel plateand allow to cure for 5 h at 25
11、+/- 3 C and 50 +/- 5 %relative humidity. After 5 h, compress the sealer bead to aheight of 1.0 mm max for 1 minute. Space bars may be usedfor proper dimensioning. Sealer must be sufficiently curedso the skin does not break, split or crack duringcompression. Additionally, after 168 hours (7 days) cut
12、the bead axially and measure the Shore A material hardnessof the beads center. Sealer must be fully cured such thatthe Shore A hardness meets the requirements in para 3.5.1.ENGINEERING MATERIAL SPECIFICATIONWSF-M4G353-A1WSS-M4G353-A2WSS-M4G353-A3WP 3948-b Page 3 of 53.5 CURED SEALANT PROPERTIESThe f
13、ollowing tests should be prepared on 1.8 mm thick slabs whichhave been cured for 168 h (7 d) at 25 +/- 3 C and 50 +/- % relativehumidity.A1 A2 A33.5.1 Hardness 35 +/- 5 26 +/- 6 26 +/- 6(ASTM D 412)3.5.2 Tensile 1.9 MPa 1.4 MPa 1.4 MPaStrength, min(ASTM D 412)3.5.3 Elongation, 400 % 300 % 300 %min(A
14、STM D 412)3.5.4 Total Silicone 0.3 0.7 0.7Volatiles, max(FLTM AV 102-01, D4through D10 and L4through L10)3.5.5 Non-Corrosive Pass Pass Passto Copper(ASTM D 130)Test Method:Apply a 3 mm diameter bead around the perimeter of a 75 mmx 100 mm sheet of SAE CA 110 copper which has been preparedin accordan
15、ce with ASTM D 130 and allow the material tocure at 25 +/- 3 C for 5 h. At the end of 5 h, place asimilar piece of SAE CA 110 copper on top of the bead andpress down, forming a chamber which is completely sealed onfour sides by the bead. Place in a 149 C oven for 24 h,allow to cool and disassemble.
16、The gasket must not tearduring disassembly and remain on the original panel. Thecopper surfaces on the inside of the sealed chamber musthave a rating of 1 max.A1 A2 A33.5.6 High 60 +/- 5 +/- x +/- xTemperatureResistance,% range(Shore HardnessChange: ASTM D 412)Test Method:Subject cured slab of mater
17、ial to 250 C for 24 h in an aircirculating oven. Measure the hardness change.ENGINEERING MATERIAL SPECIFICATIONWSF-M4G353-A1WSS-M4G353-A2WSS-M4G353-A3WP 3948-b Page 4 of 53.5.7 Chemical Resistance(ISO 1817/ASTM D 471, except preparesample per para 3.5)The volumetric swell shall be measured on a cure
18、d sample ofsealant.A1 A2 A33.5.7.1 Engine Coolant, 1 % 2 % 2 %max(48 h at 40 +/- 2 C)50 % WSE-M97B44-B*, 50 % water3.5.7.2 SAE 10W30 Oil, 30 % 15 % 15 %WSE-M2C903-A2*(48 h at 150 +/- 2 C)3.5.7.3 Gasoline, 250 % 75 % 75 %ESE-M4C89-F1*(48 h at 23 +/- 2 C)3.5.7.4 Brake Fluid, 2 % 3 % 3 %ESA-M6C25-A*(48
19、 h at 40 +/- 2 C)*Or currently released equivalent fluid (see para5.3)3.6 SHELF LIFEThere shall be no loss in properties for 6 months from the date ofreceipt by the customer when stored in the original container at nohigher than 38 C and 50 % relative humidity.3.7 ADDITIONAL REQUIREMENTSSpecific req
20、uirements for material and/or manufactured parts shallbe specified on the Engineering drawing, Engineering partsspecification and/or performance specification. All critical areaswith respect to these properties shall be clearly designated on theengineering drawing.ENGINEERING MATERIAL SPECIFICATIONW
21、SF-M4G353-A1WSS-M4G353-A2WSS-M4G353-A3WP 3948-b Page 5 of 53.8 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inall characteristics to the material upon which approval wasoriginally granted.Prior to making any change in the properties, composition,constructio
22、n, color, processing or labeling of the materialoriginally approved under this specification, whether or not suchchanges affect the materials ability to meet the specificationrequirements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposed
23、 changesand obtain the written approval of the Materials Engineeringactivity. Test data, test samples and a new code identification areto be submitted with the request.Substance restrictions imposed by law, regulations or Ford, applyto the materials addressed by this document. The restrictions arede
24、fined in Engineering Materials Specification WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMaterials defined by this specification must have prior approval by theresponsible Materials Engineering activity. Suppliers desiring approvalof their materials shall first obtain an expression of interest from thea
25、ffected 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 the test facility,demonstrating full compliance
26、 with all the requirements of thisspecification (test results, not nominal values), the materialdesignation and code number, and test specimens for Ford evaluation. Fords engineering approval of a material will be based on itsperformance to this specification and on an assessment of suitabilityfor intended processes and/or applications. Upon approval, the materialwill be added to the Engineering Material Approved Source List.
