1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 3 2018 02 26 Revised See Summary of Revisions M. Jones, NA 2013 05 17 Revised See Summary of Revisions W. Janitschke, EU 2009 12 10 Activated W. Janitschke / T. Honey, EU Controlled document at www.MATS Copyright 2018, Ford Global Techno
2、logies, LLC Page 1 of 7 COATING, POLYVINYL CHLORIDE (PVC), SPRAYABLE, PRIMER OVEN WSS-M4G318-A CURING, CHIP RESISTANT, IMPROVED PAINTABILITY 1. SCOPE The material defined by this specification is a solvent release, heat curing, stone peck resistant PVC coating for exterior body areas. 2. APPLICATION
3、 This specification was released originally for material used as a stone peck protective coating over baked electrocoat on the lower body side of passenger cars & trucks and cures during the body spray primer bake cycle. The material is compatible in paint process and can be applied by airless spray
4、 in a wet film thickness of 200 - 500 micrometer with or without pre-gelling prior to spray primer application. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS Material suppliers and part producers must conform to the Companys Standard Requirements Materials (WSS-M99P1111-A). Part producers using this mat
5、erial in their products, must use Ford approved materials and must conform to a process control plan, which has been approved by STA and/or the relevant Materials Activity. 3.2 TEST PANEL PREPARATION 3.2.1 Use 300 x 100 x 0.8 - 0.9 mm E-coated test panels according to FLTM BI 120-01. The sealer must
6、 be applied on the cured E-coated test panel within 30 minutes after oven curing. 3.2.2 Use paint-materials and curing conditions according to FLTM BV 150-05 (for each individual region) 3.3 RHEOLOGY Suppliers must submit flow characterization data to Ford Motor Company for flow modeling and process
7、 window determination. For a specified temperature range, the requested properties include, but are not limited to, viscosity, yield stress, apparent activation energy for viscosity and apparent activation energy for yield stress. This data constitutes the reference standard and shall be kept on fil
8、e at the designated material laboratory. 3.4 SOLIDS 92% min (FLTM BV 150-10) 3.5 ASH 28% max (FLTM BV 150-10) ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Copyright 2018, Ford Global Technologies, LLC Page 2 of 7 3.6 DENSITY at 23 C 1.50 kg/L max (ASTM D 1475) 3.7 VISCOSITY at 23 C (Rotational Rh
9、eometer i.e. Bohlin or equivalent) Tempering Time: 300 s Pause Interval: 180 s at 131 1/s Downward Measure: 131 1/s - 20 1/s in 120 s (30 Measure Points) Viscosity (Pas) Yield Point (Pa) 3.7.1 As received 1.00 - 1.30 140 - 150 3.7.2 After Aging 1.35 - 1.45 100 - 140 (336 h at 30 +/- 2 C) Alternative
10、 Method: (SAE J 1524, VIS-2, 1.32 mm orifice, 280 kPa) Final approval of a specific material viscosity for production 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 t
11、olerance for any one supplier shall be +/- 10 %, based on the recorded viscosity of the original approved production sample. 3.7.3 As Received +/- 10% (Conditioning Method A) 3.7.4 Aged 80 s max (Material aged in closed container for 72 h at 40 +/- 1 C, conditioning Method A) 3.7.5 90 Day Storage St
12、ability at 23 +/-2 C and 32 +/- 2 C The supplier shall provide a viscosity profile versus time 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
13、Source List. Note: Report the test method used. 3.8 SURFACE CONDITION AFTER AGING (120 h at 80 +/- 2 C) After curing the material shall be dry to the touch after cooling to 23 +/- 2 C. It shall be free from cracks or bubbles and shall show a uniform paint film without staining or discoloration. Afte
14、r bending 90 around a mandrel of 100 mm diameter within 2 s (see FLTM BV 153-04) there shall be no evidence of chipping or loss of adhesion between the various layers. ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Copyright 2018, Ford Global Technologies, LLC Page 3 of 7 Panel-Preparation: - Test
15、panels (para 3.2.1) shall be coated with the material in such a manner, that after curing a dry coating thickness of 200 + 500 micrometer is obtained. - After 10 minutes at 23 +/- 2 C, coat specimens wet on wet with spray primer. Cure specimens separately with min. and max. curing cycle (see para 3.
16、2.2) - After 10 minutes at 23 +/- 2 C, spray separate specimens with light colored standard and metallic base/clearcoat. Cure specimens separately with min. and max. curing cycle (see para 3.2.2) Test-Method: - Condition for 2 h at 23 +/- 2 C and expose in mechanical convection oven maintained at 80
17、 +/- 2 C for 120 h. - Test and examine after 24 h at 23 +/- 2 C. 3.9 FLEXIBILITY AFTER AGING (only E-Coat/Sealer) No cracking, chipping (FLTM BV 153-02, Method C, except test panels or loss of adhesion per para 3.2.1, dry coating thickness 200 + 500 micrometer, mandrel diameter 100 mm) 3.10 ADHESION
18、 AFTER HEAT AGING (only E-Coat/Sealer) No cracking, chipping (FLTM BV 153-03, Method B, except test panels or loss of adhesion per para 3.2.1, dry coating thickness 200 + 500 micrometer, 14 d aging at 80 +/- 2 C, 2 h at 23 +/- 2 C, mandrel diameter 100 mm) 3.11 ADHESION (only E-Coat/Sealer) The mate
19、rial at all ranges of coating thickness shall not peel off in a coherent film. Test Method: - Coat test panels from para 3.2.1 so that after the: (a) min curing cycle, (b) max curing cycle (see para 3.2.2) a dry coating thickness of 500 micrometer, beginning at one edge of the test panel and taperin
20、g to zero at the other is obtained. - After 24 h at 23 +/- 2 C, make two cuts through the coating along the 300 mm length of the panel and 20 mm apart and try to peel off coating starting at the edge with the lowest film thickness. 3.12 ABRASION RESISTANCE (ASTM D 968) There shall be no exposed meta
21、l area showing after No loss of adhesion on and around the (a) 200 micrometer - 150 L area of stone impact. (b) 300 micrometer - 250 L and (c) 500 micrometer - 370 L gravel impact ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Copyright 2018, Ford Global Technologies, LLC Page 4 of 7 Panel Preparat
22、ion: - Test panels (para 3.2.1) shall be coated with the material in such a manner (airless), that after curing a dry coating thickness of (a) 200 - 250, (b) 300 - 350, (c) 450 - 500 micrometer is obtained. - After 10 minutes at 23 +/- 2 C, coat specimens wet on wet with spray primer. Cure specimens
23、 separately with min. and max. curing cycle (see para 3.2.2) - After 10 minutes at 23 +/- 2 C, spray separate specimens with light colored standard and metallic base/clearcoat. Cure specimens separately with min. and max. curing cycle (see para 3.2.2). Condition for 2 h at 23 +/- 2 C and expose in m
24、echanical convection oven maintained at 70 +/- 2 C for 120 h. Test Method: - After conditioning for 24 h at 23 +/- 2 C, determine the abrasion resistance (ASTM D 968, except I.D. of tube, 25 mm, and at a gravel throughput rate of 30 - 40 L/h. For each specimen a 5 L volume of fresh gravel shall be u
25、sed. - Check for abrasion resistance and loss of adhesion after the above gravel impact. Continue abrasion test until exposure of metal area and again check for loss of adhesion. GRAVEL: Type “GABRO“ grain size 5 - 8 mm Supply Source: Odenwalder Hartstein Industrie Gmbh Lise-Meitner Str. 35 D 63457
26、Hanau 3.13 CORROSION RESISTANCE (CETP 00.00-L-467, 6 weeks) The material shall protect the test panel from corrosion. Under the material and at the border line of material edges it shall be seen no corrosion, no flaking or any evidence of loss of adhesion of the material. Panel-Preparation according
27、 to para 3.8, except sealer-thickness 500 micrometer. 3.14 FLOW RATE None (FLTM BV 151-03) Test panels per para 3.2.1, shall be coated with the material in such a manner (airless), that a wet film thickness of 500 micrometer is obtained. 3.15 COMPATIBILITY WITH PRODUCTION PAINTS No tackiness, staini
28、ng, 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 Body and Assembl
29、y Paint Operations and Materials Engineering. Test Method: . Prepare test panels per para. 3.12 ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Copyright 2018, Ford Global Technologies, LLC Page 5 of 7 . Condition painted panels at 23 +/- 2 C for 72 h. . After the 72 h conditioning period, perform t
30、he 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. 3.15.1 Wetability and Staining Test Method: - Specime
31、ns prepared per para 3.12 - Proceed as outlined under FLTM BV 153-08, Method A, para 2 - 6, except use lightest and darkest solid color and metallic basecoat/clearcoat. - After 72 h at 23 +/- 2 C, mask 1/2 of the sealer and expose for 240 h in the fluorescent sunlamp cabinet (FLTM BU 152-02). 3.15.2
32、 Determination of Discoloration After Aging None Test Method: - Specimens prepared per para 3.15.1. - After 24 h at 23 +/- 2 C store separate assemblies in the darkness for 240 h at 40 +/- 2 C in a mechanical convection oven. 3.15.3 Determination of Yellowing None (FLTM BV 153-12) 3.15.4 Resistance
33、to Weathering No discoloration (SAE J1976) Test Method: - Specimens prepared per para 3.15.1. - Expose test specimens in the Miami, Florida area for 6 months and 1 year at 5 to the south. - Prior to examination clean specimens using soap and water. 3.16 TEMPERATURE CYCLING TEST No chipping, flaking,
34、 or loss of adhesion Test Method: - Specimens prepared per para 3.15.1. - After conditioning 72 h at 23 +/- 2 C, expose specimens three times to the following cycles: 3 h at 80 +/- 2 C 1 h at 23 +/- 2 C 3 h at -40 +/- 1 C 1 h at 23 +/- 2 C 16 h at 38 +/- 2 C and 98 +/- 2% R.H. ENGINEERING MATERIAL S
35、PECIFICATION WSS-M4G318-A Copyright 2018, Ford Global Technologies, LLC Page 6 of 7 - After 24 h at 23 +/- 2 C, bend 90 around a mandrel of 100 mm diameter within 2 s (FLTM BV 153-04). 3.17 RESISTANCE TO DRIPPING The material must not fall off or show evidence of dripping. Test Method: Test panels p
36、er para 3.2.1 shall be coated with the material in such a manner (airless), that a wet film thickness of 500 micrometer is obtained. After conditioning for 5 minutes at 23 +/- 2 C, place specimens in an inverted position in a mechanical convection oven and subject to the “Minimum Curing Cycle“ accor
37、ding to FLTM BV 150-05, for each individual region. 3.18 CURED SEALANT PROPERTIES 3.18.1 Normal & Aged 2 Weeks at 70 +/- 2 oC Tensile Strength, min 4.0 MPa (ASTM D 412, die C, pulled at 300 mm/min. Minimum 5 samples Per bake) Elongation, min 75% 3.19 HARDNESS, DUROMETER A 70 +/- 10 (ASTM D 2240, aft
38、er bake) 3.20 ABRASIVES Material shall contain no abrasive agents Test Method: Dilute a 1 g sample of material under test with 3 g toluene and mix thoroughly. Rub a portion of the diluted material approximately 10 times between two pieces of flat, clean plate glass. The appearance of scratches on th
39、e glass plates shall be considered failure. 3.21 FLASH POINT Above 100 C (ASTM D 93, Method A) Note: In case testing at higher temperatures is not feasible because of gelling of test material, the supplier must certify in writing that each separate volatile ingredient has a flash point greater than
40、100 C. 3.22 SPRAYABILITY AND APPEARENCE The material shall be a smooth homogeneous mixture, free from foreign material and suitable for use in airless spray equipment. It shall spray evenly and rapidly with no tip clogging or fluctuations in the spray pattern and with a min spray back and fogging. T
41、he coating shall not exhibit craters, pinholes, sags, abnormal waviness or other objectionable appearance conditions. 3.23 QUALITY The material shall be of uniform quality, free from foreign material and properties detrimental to normal production use. ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A
42、 Copyright 2018, Ford Global Technologies, LLC Page 7 of 7 3.24 LINE TRIAL Materials being evaluated for approval to this specification shall be subjected to a production trial. Functional trial results must be approved by the affected assembly operation. Results shall be made available to Materials
43、 Engineering prior to material approval and release 3.25 ODOR Rating 3 max (FLTM BO 131-03, cured material per min cycle as in FLTM BV 150-05, for the individual region, for interior application only) 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in
44、meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 COMPATIBILITY Any other underbody coating, applied to the production material WSS-M4G318-A as an additional coating either for the purpose of repair or for other reasons, must b
45、e checked for compatibility with WSS-M4G318-A production material. 4.2 STORAGE STABILITY (From date of receipt at Ford Motor Company) The material must be stable for 3 month, when stored in sealed unopened drums out of direct sunlight at ambient temperatures between 5 C and 32 C. 4.3 MATERIAL REFERE
46、NCE All related materials used for approval of adhesives according to this specification, e.g. paint materials or metallic substrates, shall be noted in the Initial Sample Report of the adhesive. 5. SUMMARY OF REVISIONS 2018 02 26 Update Section 3.15 Compatibility with Production Paints. 2013 05 17 Deleted Option 1, 3.13 Corrosion Resistance. 2011 07 13 Added Odor Requirement. Editorial changes for clarification.
