1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Revisions1983 08 08 Released C3N1-ED399104-1WP 3948-a Page 1 of 6SEALER, HOT MELT - PREFORMED - HIGH HEAT RESISTANT - ESB-M4G248-A1PRESSURE SENSITIVE - ONE SIDE POLYETHYLENE SHEETSEALER, HOT MELT - PREFORMED - HIGH HEAT
2、 RESISTANT - ESB-M4G248-A2PRESSURE SENSITIVE1. SCOPE:The material defined by this specification is a preformed pressuresensitive butyl rubber based hot melt sealer, release paper backed. Thismaterial has low flow characteristic after high heat exposures.2. APPLICATION:This specification was released
3、 originally for a material used to sealhorizontal and vertical interior joints, such as in the shock tower andquarter to wheelhouse areas. This material can be applied in the bodyshop over oily CRLC steel, zincrometal and galvanized substrates.Initial material adhesion to oily surfaces is sufficient
4、 to withstandindirect phosphate wash pressures and electrocoat bath immersion providedcontact pressure is applied during installation.3. REQUIREMENTS:Requirements shall apply to both A1 and A2 materials unless otherwisespecified.3.1 CONDITIONINGAll test values indicated herein are based on material
5、conditionedin a controlled atmosphere of 23 +/- 2 C and 50 +/- 5% relativehumidity for 24 h prior to testing and tested under the samecontrolled conditions.3.2 INFRARED SPECTROPHOTOMETRYFord Motor Company, at its option, may conduct infrared analysis ofmaterial parts supplier to this specification.
6、The spectraestablished for initial approval shall constitute the referencestandard and shall be kept on file at Ford. All samples shallproduce spectrographs that correspond to the reference standardwhen tested under the same conditions as those specified on themaster spectra.3.3 DIMENSIONS As specif
7、ied on engineering drawingand/or in Trim & Sealer Manual3.4 POLYETHYYLENE SHEET THICKNESS, 0.03 mm nominal(ESB-M4G248-A1, sheet on one side only)ENGINEERING MATERIAL SPECIFICATION ESB-M4G248-A1ESB-M4G248-A2WP 3948-b Page 2 of 63.5 CONSISTENCY(ASTM D 1321, 100 g total load)3.5.1 As received 4.0 - 8.0
8、 mm3.5.2 Aged, 72 h at 49 C 4.0 - 8.0 mm3.6 SOLIDS, min 98%(ASTM D 2046, except heat at 102+/- 3 C for 3 h in a mechanicalconvection oven)3.7 ASH (Based on solids weight), max 55%Test Method:Place the crucible contain solids residue in a cool mufflefurnace. Slowly heat to and maintain at 760 +/- 30
9、C for 1 h, coolin desiccator and weigh.3.8 SPECIFIC GRAVITY 1.30 - 1.36(ASTM D 297, Hydrostatic Method)Tolerance for any supplier shall be +/- 0.03 based on the recordedspecific gravity of his originally approved production sample.3.9 FLOW CHARACTERISTICSFlow FlowHorizontal Vertical3.9.1 Minimum Bak
10、e Exposure 0.5 - 3.2 mm 0.5 - 4.8 mm3.9.2 Maximum Bake Exposure 4.8 mm max 6.4 mm maxTest Method:. Apply a 1.5 x 30 x 200 mm ribbon of material along thecenter line of four oily CRS panels prepared per para.5.2. To assure material contact, roll the materialribbon with a 2 kg roller (ASTM D 1000) usi
11、ng oneforward and backward stroke. Scribe each panel to mark the initial material location. Immediately after scribing, position two panels in thevertical attitude and two panels in the horizontalattitude for 1 hr. See sketch below. Place two panels, one conditioned vertically andhorizontally, in an
12、 oven to cure material at the minimumbake schedule per para. 5.3. Subject the other twopanels to the maximum bake schedule per para. 5.3.Maintain panels in conditioned attitude during bakingand cooling. Allow the panels to cool to 23 +/- 2 C. Determine the flow by measuring the material movementbelo
13、w the scribe mark.ENGINEERING MATERIAL SPECIFICATION ESB-M4G248-A1ESB-M4G248-A2WP 3948-b Page 3 of 6FLOW TEST3.10 ADHESIONShall not be removed in a continuous coherent film.Test Method:. Apply a 1.5 x 30 x 200 mm ribbon of material along the centerline on four panels of each substrate identified per
14、 para 5.2.To assure material contact, roll material ribbon with a 2 kgroller (ASTM D 1000) using one forward and backward stroke. Subject two test panels of each substrate to minimum bakeschedule and the other test panels to the maximum bake scheduleidentified per para 5.3. Maintain panels in the ho
15、rizontalattitude during baking. Condition panels after baking at 23 +/- 2 C for 1 h minimum. Separate panels into two sets. Include two test panels of eachsubstrate, one minimum bake and maximum bake, into each set. Evaluate adhesion on one panel set by cutting at 25 mm widestrip across the ribbon.
16、Insert the tip of a squared spatula underthe material edge, then attempt to hand peel material at 90 from each panel. Save test panels for Corrosion Resistance Test para. 3.11 andLow Temperature Resistance Test para. 3.12.3.11 CORROSION RESISTANCE No Corrosion or adhesion lossTest Method:. Expose on
17、e panel set prepared in para 3.10 for 240 h in a saltspray cabinet described in ASTM B 117. Condition the test panels after exposure at 23+/- 2 C for 24 h. Evaluate material adhesion as described in para. 3.10. Observefor any evidence of corrosion originating directly undermaterial.ENGINEERING MATER
18、IAL SPECIFICATION ESB-M4G248-A1ESB-M4G248-A2WP 3948-b Page 4 of 63.12 LOW TEMPERATURE RESISTANCE No cracking or adhesion failureTest Method:. Expose one panel set prepared in para 3.10 for 7 days at 70 +/-1 C. After heat exposure, condition panels at 23 +/- 2 C for 1 hminimum until cool. Attach each
19、 panel along the bottom edge of a nominal 0.8 x 300 x300 mm CRLC steel panel. Place assembled panels and cold slam apparatus described in FLTMBV 1-2 in a cold box and condition at -29 +/- 1 C for 4 h. Individually mount panels on the slam apparatus with testmaterial at bottom edge facing away from t
20、he fixture and slam 10times at -29 +/- 1 C.3.13 COMPATIBILITY WITH PRODUCTION PAINTSNo tackiness, staining, discoloration or other deleterious effectson topcoats.3.13.1 240 h weatherometer exposure(Equipment described in FLTM BO1-1)3.13.2 96 h dry ultraviolet light exposure(Equipment described in FL
21、TM BV 7-2)Test Method:. Apply a 1.5 x 30 x 200 mm material ribbon along thecenter line on three -0.8 x 100 x 300 mm phosphatecoated (ESB-M3P1) CRLC steel panels. To assure materialcontact, roll the material ribbon with a 2 kg roller(ASTM D 1000) using one forward and backward stroke. Prebake three t
22、est panels to the minimum bake scheduleidentified per para. 5.3. Maintain panels in thehorizontal attitude during baking. Condition panels at 23 +/- 2 C for 1 h minimum. Apply primer and topcoat to test panels per ESB-M2P4A.Use current production paints as identified by the Bodyand Electrical Produc
23、t Engineering Office. Condition painted panels at 23 +/- 2 C for 72 h. Subject one minimum and maximum prebake panel to eachexposure listed above. Retain extra panels as control. After exposure, examine test panels and compare to thecontrol panel.ENGINEERING MATERIAL SPECIFICATION ESB-M4G248-A1ESB-M
24、4G248-A2WP 3948-b Page 5 of 63.14 ELECTROCOAT COMPATIBILITY Shall not contaminate electrocoat(FLTM BV 19-1, Use current primer bath or cause electrocoatproduction paints as film irregularities.identified by the Body andElectrical ProductEngineering Office.)3.15 WASH RESISTANCE No wash-off(FLTM BV 16
25、-1, Method “A“,1.5 mm material thickness.)3.16 UNCURED ADHESION AND RELEASE PAPER REMOVALThe material shall adhere when hand applied to an oily steelsurface. The release paper shall be easily removed without causingthe uncured material to release from the mated oily steel surface.3.17 STORAGE STABIL
26、ITYThe material shall be stored at temperatures below 41 C away fromall sources of heat and sunlight. Heat greatly accelerates aging.Under these storage conditions, the minimum shelf life of thematerial shall be 6 months. When these materials are stored attemperatures below 23 C, they shall be condi
27、tioned at roomtemperature prior to application. Adequate conditioning permitsthe material to obtain its optimum application properties.3.18 FUNCTIONAL APPROVALMaterials being evaluated for initial approval to thisspecification shall be subjected to a production trial. Functionaltrial results should
28、be available to design and materialsengineering prior to material approval and release.3.19 SUPPLIERS RESPONSIBILITYMaterial supplied to this specification must be equivalent to thatoriginally approved. Changes in formulation or processing shallnot be made without prior approval as described in Supp
29、lierProcedure I-A.Substance restrictions imposed by regulations or Corporate policy,may apply to the material specified on this document. The materialshall comply with the substance restrictions defined in EngineeringMaterial Performance Specification, WSS-M99P9999-A1, unless anothersuffix is specif
30、ied for the application.4. APPROVAL OF SUPPLIERS:Suppliers to this specification must be approved by the affected productengineering office. Procedure for gaining approval of a specificmaterial to a new/existing ES-M specification is contained in SupplierProcedure I-A. Approved new suppliers will be
31、 added to the EngineeringMaterials Approved Source List.ENGINEERING MATERIAL SPECIFICATION ESB-M4G248-A1ESB-M4G248-A2WP 3948-b Page 6 of 65. GENERAL INFORMATIONThe material data included herein is for information only and is not arequirement for the supplier.5.1 MECHANICAL CONVECTION OVENThe mechani
32、cal oven(s) used to cure the material shall be capableof obtaining 205 C metal temperature on body steel (0.8 - 0.9 mmthickness) within 8 - 10 min.5.2 SUBSTRATESNominal panel dimensions are 0.8 x 100 x 300 mm.5.2.1 CRLC steel: surface precoated with M-99C47-A Mineral Oil atan application of approxim
33、ately 0.2 cm 3 /ft .5.2.3 Galvanized steel (ESB-M1A189-A): surface precoated withM-99C47-A Mineral Oil at an application of approximately0.2 cm /ft .5.2.4 Steel-sheet, zinc rich primer coated (ESB-M1A217-B1/B2):surface precoated M-99C47-A Mineral Oil at an applicationof approximately 0.2 cm 3 /ft 2 .5.3 MATERIAL CURE SCHEDULES5.3.1 Minimum: 171 C metal temperature for 8 min.5.3.2 Maximum: 205 C metal temperature for 30 min.
