1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 3 2017 05 31 Revision/ Released A3 See Summary of Revisions W. Janitschke, FOE 2010 06 16 Revised See Summary of Revisions M. Mehandru, FNA W. Janitschke, FOE 1995 07 13 Activated W. Curtiss G. Molnar Controlled document at www.MATS Copy
2、right 2017, Ford Global Technologies, LLC Page 1 of 5 DUPLEX SEALER, VINYL BASED, NON-YELLOWING, PUMPABLE WSS-M4G359-A OR AIRLESS, SPRAYABLE, HEAT CURING, PAINTABLE, INTERIOR AND EXTERIOR DUPLEX SEALER, VINYL BASED, NON-YELLOWING, PUMPABLE WSS-M4G359-A3 OR AIRLESS, SPRAYABLE, LOW DENSITY, HEAT CURIN
3、G, PAINTABLE, IMPROVED STONE CHIP PERFORMANCE, INTERIOR AND EXTERIOR, CONVENTIONAL PAINT SYSTEMS 1. SCOPE The material defined by this specification is a vinyl based, pumpable, or airless sprayable, paintable, heat curing sealer which is non-yellowing. WSS-M4G359-A is suitable for three wet and trad
4、itional paint systems; however compatibility with paints should be verified for any material on the approved source list. Upon initial qualification, sealers are tested to paint systems in current use and need to be validated on a regional basis. WSS-M4G359-A3 needs to be fully cured (e.g. in Primer
5、 Oven) before paint application used in conventional paint systems. 2. APPLICATION This specification was released originally for sealing interior and exterior body seams, including door hem flanges, Underbody Coating and Roof Ditch Sealing. The material is intended for use in the paint shop and app
6、lied over freshly baked electrocoat. Acceptable paintability is achieved with or without primer surfacer. The material has been formulated to prevent topcoat yellowing and allow topcoat cure in low airflow conditions. 3. REQUIREMENTS 3.1 APPROVED SOURCES This specification requires the use of approv
7、ed sources. Only the sources identified on the Ford Approved Source List (ASL) can be used when this specification is listed on the drawing, CAD file, or other documents. The list of approved sources is located within Ford at or available externally through a Ford Materials Engineer. 3.2 RHEOLOGY S
8、uppliers must submit flow characterization data to Ford Motor Company for flow modeling and process window determination. For a specified temperature range, the requested properties include, but are not limited to, viscosity and yield stress. This data constitutes the reference standard and shall be
9、 kept on file at the designated material laboratory. ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Technologies, LLC Page 2 of 13 Rheometer Instrument: e.g. Bohlin CVO 50 or equivalent equipment Parameter: Viscometry: Shear Rate Measuring System: PP 20 Gap: 500m Temp
10、erature Modus: Isotherm Temperature: 20C Temperature Time out: 100 s Pre-Shear: off Sweep Type: Table, linear Start: 131.0 s-1 End: 0.0 s-1 Ramp: down Delay: 5 s Integration: 1 s Delay Time: constant Data Points: 20 Viscosity: Measure 30 times at 30 sec and 90 sec; calculate the mean and the standar
11、d Deviation. Yield stress: Take the data points 1 18 and calculate the regression line. The intersection to the y-axe is the Yield stress. 3.2.1. Initial A A3 Viscosity at 30 sec Pas: Report or 3 5 3 5 Viscosity at 90 sec Pas: Report or 5.5 7.5 5.5 7.5 Yield stress Pa: Report or 220 - 280 100 160 3.
12、2.2 Aged + 50 % from Initial max (Material aged in closed container for 168 h at 40 +/- 1 C, conditioning Method A) 3.3 SOLIDS 96% min (FLTM BV 150-10. After 30 minutes curing per FLTM BV 150-05 (nominal), for each region to be used. Save sample for next test, para 3.4) 3.4 ASH (Based on solids weig
13、ht) 40% max (FLTM BV 150-10, 760 +/- 30 C) The ash content tolerance for any one supplier shall be +/- 5% based on the recorded ash content for their originally approved production sample. 3.5 WEIGHT PER VOLUME A A3 (ASTM D 816) 1.20 1.61 kg/L 0.8 1.19 kg/L The weight tolerance for any one supplier
14、shall be +/- 0.05 kg/L, not to exceed either limit, based on the recorded weight of their original approved production sample 3.6 FLASHPOINT 100 C (ASTM D 93, Method A) Note: If testing at higher temperatures is not feasible because of gelling of test material, the supplier must certify in writing t
15、hat each separate volatile ingredient has a flash point 100 C. ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Technologies, LLC Page 3 of 13 3.7 VISCOSITY at 23 C (SAE J1524, VIS-2, 1.32 mm orifice, 280 kPa) Final approval of a specific material viscosity for producti
16、on shipments shall be made by the affected manufacturing activity. In all cases, the viscosity shall be within process limits as identified on the material control plan. The viscosity tolerance for any one supplier shall be +/- 10%, based on the recorded viscosity of the original approved production
17、 sample. A A3 3.7.1 As received as received +/- 10% 30 - 70 s (Conditioning Method A) 3.7.2 Aged Original + 50% max (Material aged in closed container for 168 h at 40 +/- 1 C, conditioning Method A) 3.7.3 90 Day Storage Stability at 23 +/-2 C The supplier shall provide a viscosity profile versus tim
18、e from initial through 90 days storage at 23 +/- 2 C and 32 +/- 2 C. Measurements shall be taken at weekly intervals. Curves shall be made available to Materials Engineering prior to addition on the Approved Source List. 3.8 SAG RESISTANCE 3.8.1 Horizontal 6.4 mm max 3.8.2 Vertical 6.4 mm max 3.8.3
19、Inverted No loss of material Test Method: Apply a 3 x 30 x 200 mm ribbon of material along the center line of two of the three electrocoated panels prepared per para 4.2 Scribe panels to mark the initial material location. Position the panels with the material in the attitude above for 1 h at RT. Im
20、mediately after conditioning, place panels in an oven to cure material at the minimum bake schedule per FLTM BV 150-05 table according to the region to be used. Maintain panels in the specified attitude during baking and cooling. Allow the panel to cool to 23 +/- 2 C. Determine the sag by measuring
21、the material movement below the scribe mark. Repeat the test using the second set of panels at the maximum bake per FLTM BV 150-05 table according to the region to be used. ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Technologies, LLC Page 4 of 13 3.9 BRIDGING 3.0
22、mm max sagging Test Method: Apply a 20 x 40 x 160 mm material bead over the 6.4 mm diameter holes shown in sketch below. Condition the test fixture with material bead for 15 minutes at 23 +/- 2 C, then bake fixture at the minimum bake schedule acc. to FLTM BV 150-05 for each region to be used. Measu
23、re the amount of material sag through hole. Max. 3 mm according to para 3.8 BRIDGING TEST FIXTURE 3.10 ADHESION Shall not be peeled off in a continuous film at any thickness. Test Method: Apply 6.4 - 0 mm tapered material ribbon on two electrocoated panels. See sketch below. Subject one test panel,
24、to the minimum bake schedule and the other test panel to the maximum bake schedule acc. to FLTM BV 150-05 for each region to be used. Condition panels after baking at 23 +/- 2 C for 1 h minimum. Evaluate adhesion by cutting a 25 mm wide strip across the tapered ribbon. Using the tip of a square spat
25、ula, lift the material at both the thin and thick film edges then attempt to had peel material at 90 degrees from substrate. Save test panels for Heat Resistance Test, para 3.13 and Corrosion Resistance Test, para 3.14 ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Te
26、chnologies, LLC Page 5 of 13 3.11 COLD ADHESION No flaking, no (FLTM BV 151-01, - 40 C, load “A“) loss of Adhesion 3.12 WATER ABSORPTION, % max A A3 (FLTM BV 153-07, Method A., bake acc. 1.5 1.0 FLTM BV 150-05, for each region to be used) 3.13 HEAT RESISTANCE TEST No evidence of blistering, cracking
27、, charring or other deleterious effects Test Method: Examine the test material prepared for Adhesion Test, for any of the above conditions. 3.14 CORROSION RESISTANCE TEST No corrosion or adhesion loss The material shall protect the test panel from corrosion Prepare test specimen in accordance to par
28、agraph 3.10 CETP 00.00-L-467, 12 weeks. Evaluate material adhesion as described in para 3.10 Observe for any evidence of corrosion 10 mm from the strip. 3.15 MANDREL BEND TEST No cracking or adhesion (FLTM BV 122-01, material bake, failure schedule per FLTM BV 150-05 material bake schedule for the r
29、egion , heat age test specimen 14 days at 70 +/- 1 C before test) 3.15.1 Test at 23 +/- 2 C 3.15.2 Test at -20 +/- 1 C ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Technologies, LLC Page 6 of 13 3.16 COMPATIBILITY WITH PRODUCTION PAINTS - INITIAL REQUIREMENTS No tac
30、kiness, staining, discoloration, dulling, softening, paint transfer, significant color shift, difference in orientation of metallic flakes (metallic paints) or other objectionable appearance defects in the paint over the sealer. Note: Evidence of any defects as stated above shall be reviewed with Bo
31、dy and Assembly Paint Operations and Materials Engineering. Test Method: . Prepare test panels per matrix provided by material engineering or paint engineering for that region. Use current production paints as identified by Paint Engineering. . Condition painted panels at 23 +/- 2 C for 72 h. . Afte
32、r the 72 h conditioning period, perform the following tests on each panel: . Cross hatch adhesion check - FLTM BI 106-01, Method B. . Resistance to Xylene - Using a back and forth motion, rub surface of enamel 10 times with a small wad of cheesecloth which has been wetted with xylene. Subject panels
33、 for each paint/bake condition to each exposure listed below. Retain an unexposed panel as control. 3.16.1 Wetability and Staining Test Method: After 24 h at 23 +/- 2 C mask 1/2 of the 3 x 30 x 200 mm sealer beads and expose each assembly for 240 h. a) At 23 +/- 2 C, b) At 40 +/- 1 C, c) In the Fluo
34、rescent Sunlamp Cabinet (FLTM BU 152-02). Examine the exposed and unexposed portions of the sealer steps of 24 h. 3.16.2 Resistance to Weathering (SAE J 2527) 3.16.2.1 2000 hours Xenon 3.16.2.2 One Year Florida Test Method: Expose test specimens in the Miami/Florida area for 6 months and 1 year at 5
35、 degrees facing south. Prior to examination clean specimens using soap (SM1B4) and water. 3.16.3 Determination of Yellowing None (FLTM BV 153-12) Use bake conditions per FLTM BV 150-05 (use the table for the region to used), ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Glo
36、bal Technologies, LLC Page 7 of 13 3.17 PAINTABILITY CONFINED AREA Uncovered area - No evidence of paint transfer after 10 double rubs with xylene. Covered area - Paint transfer allowed after a minimum of 5 double rubs with xylene. Test Method: . Apply two 3 x 25 x 100 mm ribbons of material to an e
37、-coated panel. . Place a 475 ml can over one of the sealer ribbons. Bake the assembly according to the minimum prime bake (first minimum) condition acc. to FLTM BV 150-05 for each region to be used. . (This will simulate cure of the primer over the sealer in a restricted airflow condition.) . Remove
38、 the can and paint with production topcoat as indicated by Materials Engineering. Film builds shall be 0.013 mm for basecoat and 0.013 mm for clearcoat. . Return the can to the original position over the sealer. Bake the assembly at the minimum topcoat bake (second minimum) acc. to FLTM BV 150-05 fo
39、r each region to be used. . After bake, remove the can and cool the panel for 24 h at 23 +/- 2 C . Evaluate the panels visually for any deterioration of the sealer/paint. Perform a solvent resistance test on both surfaces by rubbing the painted sealer 10 times with xylene (10 double rubs). Examine t
40、he rag for evidence of paint transfer. 3.18 FUMING TEST No evidence of paint peeling. (FLTM BV 130-01) after paint peeling cross hatch test 3.19 CRACK RESISTANCE 5000 cycles min (FLTM BV 115-01, bake 2 sets of No cracks panels max bake and min bake per FLTM BV 150-05 according to the region for use,
41、 for normal and aged tests). 3.20 SHEAR ADHESION, min MPa (FLTM BV 154-03, Method B Prepare two sets of panel minimum and maximum bake according to FLTM BV 150-05, for region to be used, bond line thickness, 3 mm, 3 cm overlap, test at a crosshead speed of 25 mm per min.) Min Bake Max Bake Exposure
42、Exposure 3.20.1 At 23 +/- 2 C, min 0.5 0.5 3.20.2 At 90 +/- 2 C, min 0.2 0.2 3.20.3 At - 40 +/- 2 C, min 0.5 0.5 ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Technologies, LLC Page 8 of 13 3.21 PEEL STRENGTH, min N/mm (FLTM BV 154-03, Method C) (Prepare two sets of
43、panel minimum and maximum bake according to FLTM BV 150-05, for region to be used, bond line thickness 3 mm, 10 cm overlap, test at a crosshead speed of 25 mm per min.) Min Bake Max Bake Exposure Exposure 3.21.1 At 23 +/- 2 C, min 5 5 3.21.2 At 90 +/- 2 C, min 2 2 3.21.3 At - 40 +/- 2 C, min 5 5 3.2
44、2 HARDNESS, DUROMETER A 40 - 80 (ASTM D 2240) The hardness tolerance for any one supplier shall be +/- 5 based on the recorded hardness of their originally approved production sample. Test Method: . Apply enough material into a container (such as an ointment tin) to give a 6.4 mm thickness slab. . B
45、ake material at minimum curing according to FLTM BV 150-05 for region to be used. . Condition test sample at 23 +/- 2 C for 4 h, then check instantaneous material hardness. 3.23 CURED SEALANT PROPERTIES Painted specimen has to be cured acc. to FLTM BV 150-05, for each region to be used 3.23.1 Normal
46、 Tensile Strength 0.9 MPa min (ASTM D 412, die C, pulled at 300 mm/min. Minimum 5 samples per bake) Elongation 50% min Tear Strength 4.0 N/mm min (ASTM D 624, die C, pulled at 500 mm/min) 3.23.2 Aged (Cured samples aged 2 weeks at 90 +/- 2 C) Tensile Strength 1.0 MPa min (ASTM D 412, die C, pulled a
47、t 300 mm/min. Minimum 5 samples per bake) Elongation 50% min Tear Strength 4.0 N/mm min (ASTM D 624, Die C, pulled at 500 mm/min) ENGINEERING MATERIAL SPECIFICATION WSS-M4G359-A/A3 Copyright 2017, Ford Global Technologies, LLC Page 9 of 13 3.24 ABRASIVES None Test Method: . Dilute a 1 g sample of th
48、e material with 1 g of Naphtha or equivalent, and mix thoroughly. . Rub a portion of the diluted material 100 times between 2 pieces of flat, clean plate glass. The appearance of scratches on the glass plate shall be considered failure. 3.25 SPRAYABILITY Shall be suitable for use in the airless spray equipment designated by the Paint Operation Activity. 3.26 ABRASION RESISTANCE (ASTM D 968) There shall be no exposed metal area showing after 300 L gravel impact. No loss of adhesion on and around the area of stone impact. Panel Preparation: Test panels of 300 x 100
