1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Revisions1983 09 27 CSN1-ED419746-1WP 3948-a Page 1 of 5SEALER, VINYL BASED - THUMBABLE GRADE - ESB-M4G250-AFEATHERABLE - PAINTABLE1. SCOPE:The material defined by this specification is a vinyl resin based,thumbable gra
2、de, heat curing sealer.2. APPLICATION:This specification was released originally for materials used to seal andfeather exterior lap joints and voids such as corners in door openings.This material has good feathering characteristics which improves sealerhandling and final sealer appearance after body
3、 painting.3. REQUIREMENTS:3.1 CONDITIONINGAll test values indicated herein are based on material 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 SPECTROPHOTOMETRY AND/OR THERMAL
4、ANALYSISFord Motor Company, at its option, may conduct infrared and/orthermal analysis of material/parts supplied to this specification.The curves established for initial approval shall constitute thereference standard and shall be kept on file at Central Laboratory.All samples shall produce curves
5、that correspond to the referencestandard when tested under the same conditions as those specifiedon the master curve.3.3 SOLIDS, min 99 %(ASTM D 2834, except heat at102 +/- 1 C for 3 h in a mechanicalconvection oven. Save sample fornext test, para 3.4)3.4 ASH, max 90 %(Based on solids weight)Test Me
6、thod:. Place the crucible containing the solids residue in a coolmuffle furnace. Slowly heat to and maintain at 760 +/- 30 C for 1 h. Cool crucible in desiccator and weigh.ENGINEERING MATERIAL SPECIFICATION ESB-M4G250-AWP 3948-b Page 2 of 53.5 WEIGHT PER VOLUME 1.4 - 1.8 kg/L(ASTM D 816)The weight t
7、olerance for any one supplier shall be +/- 0.024 kg/L,based on the weight of the original approved production samples.3.6 CONE PENETRATION (UNWORKED)(ASTM D 217, 150 g total load)Bulk As received 5.0 - 20.0 mmAged 72 h at 43 C 5.0 - 20.0 mm3.7 HARDNESS, DUROMETER “D“ 15 - 40(ASTM D 2240)Test Method:
8、. Apply enough material into two ointment tin type containers toattain a cured material section approximately 6.4 mm thick. Bake one sample at the minimum bake schedule and the othersample at the maximum bake schedule identified per para 5.3. Condition test samples at 23 +/- 2 C for 4 h, then checki
9、nstantaneous material hardness. Save samples for next test.3.8 CONTRACTION OR EXPANSION DURING CUREShall not pull away from sides or show more than 3 mm evidence ofoverflow.Test Method:. Examine the samples prepared in para 3.7 for conformance to thisrequirement.3.9 ADHESIONShall not be peeled off i
10、n a continuous film at any thickness.Test Method:. Apply a material daub (approximately 10 g) to each of twoelectrocoated panels prepared per para 5.2. Using thumb,feather material along edges. Subject one test panel, to the minimum bake schedule and theother one test panel to the maximum bake sched
11、ule identified perpara 5.3. Condition panels after baking at 23 +/- 2 C for 1 h minimum. Evaluate adhesion by cutting a 25 mm wide strip across thematerial daub. Using the tip of a squared spatula, lift thematerial at one edge, then attempt to hand peel material at 90deg from substrate. Save test pa
12、nels for Corrosion Resistance Test, para 3.10.ENGINEERING MATERIAL SPECIFICATION ESB-M4G250-AWP 3948-b Page 3 of 53.10 CORROSION RESISTANCE No corrosion or adhesion lossTest Method:. Expose the panels prepared in para 3.9 for 240 h in the saltspray cabinet described per ASTM B 117. Condition the tes
13、t 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.3.11 INVERTED BAKENo evidence of cracks, separation from substrate or loss ofmaterial.Test Method:. Apply a material daub (app
14、roximately 10 g) to each of twoelectrocoated panels prepared per para 5.2. Invert panels and condition at 23 +/- 2 C for 15 min. Maintain panels in inverted position and subject one test panelto the minimum bake schedule and the other test panel to themaximum bake schedule identified per para 5.3. S
15、ave sample for Low Temperature Resistance Test, para 3.12.3.12 LOW TEMPERATURE RESISTANCE No cracking or adhesion failureTest Method:. Expose the panels prepared in para 3.11 for 7 days at 70 +/- 1C. After heat exposure, condition panels at 23 +/- 2 C for 1 hminimum until cool. Attach each panel alo
16、ng the bottom edge of a nominal 0.8 x 300 x300 mm CRS panel. Place assembled panels and cold slam apparatus described in FLTMBV 1-2 in 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 the fixture and slam
17、 10times at -29 +/- 1 C.ENGINEERING MATERIAL SPECIFICATION ESB-M4G250-AWP 3948-b Page 4 of 53.13 COMPATIBILITY WITH PRODUCTION PAINTSNo tackiness, staining, discoloration or other deleterious effectson topcoats.3.13.1 240 h weatherometer exposure(Equipment described in FLTM BO 1-1)3.13.2 96 h dry ul
18、traviolet light exposure(Equipment described in FLTM BV 7-2)Test Method:. Apply a material daub (approximately 10 g) to each ofthree electrocoated panels prepared per para 5.2. Feather the material along the edges using thumb. Inaddition, lightly feather half of the material ribbonwith a brush satur
19、ated with M-14J507-A or equivalentsolvent. Prepare test panels per FLTM BV 53-8, procedure A,except use a primer bake schedule of 135 +/- 1 C for 8min metal temperature and a topcoat bake schedule of 130+/- 1 C for 10 min metal temperature. Apply currentproduction paints as identified by the Body an
20、dElectrical Product Engineering Office. Condition painted panels at 23 +/- 2 C for 72 h. Subject one painted panel to each exposure listed above.Retain extra panel as control. After exposure, examine test panels and compare to thecontrol panel.3.14 SHEAR ADHESION, min 330 N(FLTM BV 1-6, substrate pe
21、r para 5.2,3 mm bondline thickness, materialbake schedule per para 5.3)3.15 STORAGE STABILITYThe material shall be stored at temperatures below 41 C away fromall sources of heat and sunlight. Heat greatly accelerates aging.Under those storage conditions, the minimum shelf life of thematerial shall b
22、e 3 months. When these materials are stored attemperatures below 23 C, they shall be conditioned at roomtemperature prior to application. Adequate conditioning permitsthe material to obtain its optimum application properties.3.16 FUNCTIONAL APPROVALMaterials being evaluated for initial approval to t
23、hisspecification shall be subjected to a production trial. Functionaltrial results should be available to design and materialsengineering prior to material approval and release.ENGINEERING MATERIAL SPECIFICATION ESB-M4G250-AWP 3948-b Page 5 of 53.17 SUPPLIERS RESPONSIBILITYMaterials supplied to this
24、 specification must be equivalent to thatoriginally approved. Changes in formulation or processing shallnot be made without prior approval as described in SupplierProcedure I-A.4. APPROVAL OF SUPPLIERS:Suppliers to this specification must be approved by the affected productengineering office. Proced
25、ure for gaining approval of a specificmaterial to a new/existing ES-M specification is contained in SupplierProcedure I-A. Approved new suppliers will be added to the EngineeringMaterials Approved Source List.5. GENERAL INFORMATION:The material data included herein is for information only and isnot
26、a requirement for the supplier.5.1 MECHANICAL CONVECTION OVENThe mechanical 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 mmElectrocoat primed s
27、teel panel: Prepared per ESB-M2P4-Aperformance specification. Use current production paints asidentified by the Body and Electrical Product Engineering Office.5.3 MATERIAL CURE SCHEDULES5.3.1 Minimum: 8 min at 135 +/- 1 C metal temperature5.3.2 Maximum: 20 min at 177 +/- 1 C metal temperature5.4 COLOR Pink or as specified by B&AOProcess Engineering Department
