1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1985 11 14 Para 3.3, Revised values1985 07 26 TQ2-017B-73 ReleasedWP 3948-a Page 1 of 4 SEALANT, SILICONE RUBBER - AMINE CURE ESL-M4G273-A1. SCOPEThe material defined by this specification is a non-corrosive, one
2、component, room temperature vulcanizing silicone rubber.2. APPLICATIONThis specification was released originally for material used as a sealantgasket between the rear axle housing and cover.3. REQUIREMENTS3.1 UNCURED PROPERTIES3.1.1 Color Black3.1.2 Application Rate 80 - 150 g/minute(0.62 MPa nozzle
3、 pressure,3.175 mm orifice)3.1.3 Tack-free Time, max 30 minutes(25 EC, 50% R.H.)3.1.4 Cure Rate PassTest Method: Apply a 3.18 mm diameter bead of sealer to asteel plate and allow the material to cure for 5 h at 25 + 3EC and 50 + 5% R.H. After 5 h, compress the sealer bead to aheight of 1.0 mm maximu
4、m for 1 minute. Spacer bars may beused for proper dimensioning. Sealer must be sufficientlycured so the skin does not break, split or crack duringcompression.3.1.5 Non-Volatiles, min 92%(24 h at 70E C, by weight)3.2 CURED PROPERTIES(1.78 mm test slabs, cured 7 days at25 EC and 50% R.H.)3.2.1 Specifi
5、c Gravity 1.01 - 1.05(ASTM D 792)NOT TO BE USED FOR NEW DESIGN2014 N Status No replacement named L. Sinclair, NAENGINEERING MATERIAL SPECIFICATIONESL-M4G273-AWP 3948-b Page 2 of 4 3.2.2 Durometer Hardness A 55 + 10(ASTM D 2240)3.2.3 Tensile Strength, min 1725 kPa(ASTM D 412)3.2.4 Elongation, min 100
6、ASTM D 412)3.2.5 Tear Strength, min 5.3 N/mm(ASTM D 624, Die B)3.2.6 Low Temperature Brittleness, min -54 EC(ASTM D 2137, Method A)3.2.7 Shear Adhesion, min(ASTM D 1002)7 days at 25 E C, 50% R.H. 550 kPa7 days at 25 EC, 50% R.H., 855 kPa8 h at 70 EC7 days at 25 E C, 50% R.H., 2000 kPa8 h at 121 EC
7、3.3 OIL RESISTANCE3.3.1 Resistance to SAE 10W30 Super Permalube(14 days at 150 E C)3.3.1.1 Durometer Change, max -50%(ASTM D 2240)3.3.1.2 Tensile Change, max -35%(ASTM D 412)3.3.1.3 Elongation Change, max +65%(ASTM D 412)3.3.1.4 Volume Swell, max +30%(ASTM D 471)3.3.2 Resistance to ATF (ESP-M2C138-C
8、J)(14 days at 150 E C)3.3.2.1 Durometer Change, max -50%(ASTM D 2240)3.3.2.2 Tensile Change, max -35%(ASTM D 412)ENGINEERING MATERIAL SPECIFICATIONESL-M4G273-AWP 3948-b Page 3 of 4 3.3.2.3 Elongation Change, max +65%(ASTM D 412)3.3.2.4 Volume Swell, max +30%(ASTM D 471)E 3.3.3 Resistance to Hypoid G
9、ear Lube (ESL-M2C105-A2)Test Method:. Squeeze sealant (0.508 mm thick) between metal disks. Hold disks in position with 0.508 mm shims and nut andbolt. Air cure (25 E C, 50% r.H.) assembly for 72 h. Soak assembly for 24 h at 121 EC in gear lube. After 24 h evaluate sealant for adhesion and lubecompa
10、tibility.Evaluation:. Evaluate lube compatibility by visually checking thesealant for excessive softening, dissolving or any otheradverse reaction. Evaluate adhesion by separating the disks. Acceptableadhesion is when a wedge must be forced between them toseparate the disks. There must be cohesive f
11、ailure.3.4 QUALITYShall be a smooth homogeneous mixture, free from foreign materialsand properties detrimental to normal production application. It shallno t contain particles or solid spots of significant size to causeblockage of a 508 m diameter orifice.3.5 INFRARED SPECTROPHOTOMETRYFord Motor Com
12、pany, at its option, may conduct infrared analysis ofmateri al/parts supplied to this specification. The spectraesta blished for initial approval shall constitute the referencest andard and shall be kept on file at the designated materiallaboratory. All samples shall produce spectra t hat correspond
13、 to thereferen ce standard when tested under the same conditions as thosespecified on the master spectrum.3.6 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.ENGINEERING MATERIAL
14、SPECIFICATIONESL-M4G273-AWP 3948-b Page 4 of 4 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 specificationrequi
15、r ements, the Supplier shall notify 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
16、restrictions imposed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Material Specification WS S-M99P9999-A1, unlessa different suffix (e.g., A2 or A3) is specified on the engineeringdocument for the application.4. APPROVAL OF
17、 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. Uponrequ
18、est, the Supplier shall submit to the affected Materials Engineeringactivity its own laboratory rep ort to the specification (test results, notnominal values), the material designation and code number, and testspecim ens for Ford evaluation. Upon approval, the material will be addedto the Engineering Material Approved Source List.
