1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1995 01 13 Revised and Retyped1985 11 26 SM/EQ/5580TP ReleasedWP 3948-a Page 1 of 5ADHESIVE, SILICONE, TWO COMPONENT ESK-M2G298-A1ADHESIVE, SILICONE, TWO COMPONENT ESK-M2G298-A21. SCOPEThe ma terials define
2、d by these specifications are thixotropic pastes(adhesiv e and hardener) which cure to a humidity resistant siliconeadhesive after mixing.ESK-M2G298-A1 AdhesiveESK-M2G298-A2 Hardener2. APPLICATIONThese specifications were released originally for materials used to bondPC head lamp respectively parkin
3、g lamp lenses with ABS reflectors.3. REQUIREMENTS A1 A23.1 Color White Gray3.2 Density at 20 C, g/cm3 1.40 - 1.48 1.48 - 1.543.3 Viscosity at 20 C, Pa.sTable 1Rotational Frequency, min-1 1 2.5 5ESK-M2G298-A1 (Pa.s) +/- 20 % 370 220 130ESK-M2G298-A2 (Pa.s) +/- 20 % 1760 880 480Test Method:1) Brookfie
4、ld viscosimeter, type HBT, Helipath stand, spindleNo. T/B.2) Conditi on material at 20 C; stir material for 1 minute byspatula.3) Let the material rest for 30 minutes.ENGINEERING MATERIAL SPECIFICATIONESK-M2G298-A1/A2WP 3948-b Page 2 of 5 4) Start measuring with undisturbed material at a dipping dep
5、th ofspindle of 25 mm at 1/minute.5) After reaching of the third time the deepest spindle position,continue measuring in the same way at frequencies of 2.5/minuteand 5/minute.6) Record the values for each frequency at the lowest spindleposition (50 mm).7) The aver age result as calculated from singl
6、e values at eachfrequency shall conform to the requirement s specified in Table 1.3.4 MIXING RATIOESK-M2G298-A1/A2 = 10:1(Parts by Weight)3.4.1 Pot Life at 20 +/- 2 C 5 - 45 minutes(55 g amount)3.5 SHEAR STRENGTH OF MIXED COMPONENTSTest Method:1) As shown in Figure 1 apply adhesive after mixing time
7、 of 3minutes to PC test specimens (ESK-M4D471-A ) and assemble with ABStest specimens (S-M4D4794-A).2) Clamp specimens s o that an adhesive thickness of 0.02 to 0.08 mmis obtained and s tore for 24 hours at 23 +/- 2 C (original or asspecified below.3) Determine shear strength at a speed of testing o
8、f 25 mm/minute.3.5.1 Initial Shear Strength, min 10 N/cm2(1 h after assembling)3.5.2 Original3.5.2.1 Measured at 23 +/- 2 C, min 250 N/cm23.5.2.2 Measured at 90 +/- 2 C, max * 10 %3.5.2.3 Measured at - 40 +/- 2 C * No loss of adhesion* (30 minutes conditioning time up to measuring.3.5.3 After Ageing
9、3.5.3.1 Heat Ageing No loss of adhesion(14 d at 80 +/- 2 C, 1 h at23 +/- 2 C)ENGINEERING MATERIAL SPECIFICATIONESK-M2G298-A1/A2WP 3948-b Page 3 of 5 3.5.3.2 Humidity Ageing, max - 25 %(9 d at 38 +/- 2 C and 98 +/-2 % relative humidity, 1 h at23 +/- 2 C)3.5.3.3 Environmental Cycling, max - 15 %Specim
10、 ens must be exposed four times to thefollowing cycle in the sequence below:16 h at 38 +/- 2 C and 98 +/- 2 % relative hum idity4 h at - 40 +/- 1 C4 h at 90 +/- 2 C3.5.3.4 Waxing/Dewaxing No loss of adhesion(15 minutes immersion inwaxing compound according toU-MG009-21A, 1 h at 23 +/-2 C, 15 minutes
11、 immersion indewaxing to U-MB005-80C0, 1 hat 23 +/- 2 C)3.6 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/ortherma l analysis of material/parts supplied to this specification.The IR spectra and thermograms established for i nitial appro
12、val 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 testedunder the same conditions.3.7 SUBSTANCE CONTROLLegal, health, safety a nd environmenta
13、l constraints may apply to themate rials which are submitted for approval to this specification.Refer to Engineering Material Specification WSS-M99P9999-A1.3.8 QUALITYThe material shall be of uniform quality free from foreign materialand properties detrimental to normal production use.3.9 SUPPLIERS
14、RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.ENGINEERING MATERIAL SPECIFICATIONESK-M2G298-A1/A2WP 3948-b Page 4 of 5 Pri or to making any change in the properties, composition,constr uct
15、ion, 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 notify Purchasing, Toxicology andthe affected Materials Engineering activity of the pro
16、posed 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, regulations or Ford, apply tothe materials addressed by this document. The restrictions
17、 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. Suppliers desiring approvalof thei r materials shall first obtain an expression of interest
18、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 by aqualified and authorized representative of the test faci lity, demonstratingful
19、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 su
20、itability for intended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.5. GENERAL INFORMATIONThe information given below is provided for assistance and clarificationand does not represent requirement(s) to this specification.5.
21、1 STORAGE STABILITYFrom date of receipt at Ford Motor Company)Minimum 6 months when stored at ambient temperat ure of 5 C to 28 C inunopened drums.5.2 HOMOGENEITYHomogenize hardener before use.5.3 SENSITIVITY TO ALCOHOLCaution: Slight traces of alcohol will inhibit the cure of thisadhesive. The use of alcohol containing solvents is prohibited forclean up or other use.ENGINEERING MATERIAL SPECIFICATIONESK-M2G298-A1/A2WP 3948-b Page 5 of 5
