1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 1 2011 07 13 Revised Odor Requirements added W. Janitschke, EU 2009 12 10 Activated W. Janitschke / T. Honey, EU Controlled document at www.MATS Copyright 2011, Ford Global Technologies, LLC Page 1 of 7 COATING, POLYVINYL CHLORIDE (PVC),
2、 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 This specification was released originally for material u
3、sed 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 in a wet film thickness of 200 - 500 micrometer with or w
4、ithout 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 material in their products, must use Ford approved materials
5、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 be applied on the cured E-coated test panel within 30 minu
6、tes 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 window determination. For a specified temperature range, t
7、he 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 file at the designated material laboratory. 3.4 SOLIDS 92% min
8、 (FLTM BV 150-10) 3.5 ASH 28% max (FLTM BV 150-10) ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Printed copies are uncontrolled Copyright 2011, 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 Rheometer i.e. Bohlin or equi
9、valent) 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 Method: (SAE J 1524, VIS-2
10、, 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 tolerance for any one suppli
11、er 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 Stability at 23 +/-2 C and 32
12、 +/- 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 Source List. Note: Report t
13、he 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. After bending 90 around a mandr
14、el 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 Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 3 of 7 Panel-Preparation: -
15、Test 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 pa
16、ra 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) Test-Method: - Condition for 2 h at 23 +/- 2 C and expose in mechanical convection oven maintained
17、at 80 +/- 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 ADH
18、ESION 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
19、 material 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 ta
20、pering 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
21、 metal 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 Printed copies are uncontrolled Copyright 2011, Ford Global Technol
22、ogies, LLC Page 4 of 7 Panel Preparation: - 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
23、wet with spray primer. Cure specimens 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
24、for 2 h at 23 +/- 2 C and expose in mechanical 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
25、5 L volume of fresh gravel shall be used. - 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 Industr
26、ie Gmbh Lise-Meitner Str. 35 D 63457 Hanau 3.13 CORROSION RESISTANCE 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
27、according to para 3.8, except sealer-thickness 500 micrometer. 3.13.1 Option 1 (FLTM BI 123-03, 50 cycles) Or 3.13.2 Option 2 (CETP 00.00-L-467, 6 weeks) Note: Report the test method used. 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 ma
28、nner (airless), that a wet film thickness of 500 micrometer is obtained. ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 5 of 7 3.15 COMPATIBILITY WITH PRODUCTION PAINTS No tackiness of material surface, no cracking o
29、r blistering. The paint shall cover the sealer satisfactorily without evidence of discoloration or staining. 3.15.1 Wetability and Staining Test Method: - Specimens 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 an
30、d 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 Determination of Discoloration After Aging None Test Method: - Specimens prepared per para 3.15.1. - After 24 h at 23 +/- 2 C store separ
31、ate 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 to Weathering No discoloration (SAE J1976) Test Method: - Specimens prepared per para 3.15.1. - Expose test specimens in the Miami, Florid
32、a 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, or loss of adhesion Test Method: - Specimens prepared per para 3.15.1. ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Printed copies are
33、 uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 6 of 7 - 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. - After 24 h at 23 +/-
34、 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 per para 3.2.1 shall be coated with the material in such a manner (airless), that a wet film thickness of 5
35、00 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“ according to FLTM BV 150-05, for each individual region. 3.18 CURED SEALANT PROPERTIES 3.18.1 Normal & Aged 2 W
36、eeks 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, after bake) 3.20 ABRASIVES Material shall contain no abrasive agents Test Method: Dilute a 1 g sample of mate
37、rial 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 the glass plates shall be considered failure. 3.21 FLASH POINT Above 100 C (ASTM D 93, Method A) Note: In ca
38、se 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 100 C. ENGINEERING MATERIAL SPECIFICATION WSS-M4G318-A Printed copies are uncontrolled Copyright 2011, For
39、d Global Technologies, LLC Page 7 of 7 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
40、 a min spray back and fogging. The 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. 3.24 LINE TRIAL
41、 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 Engineering prior to material approval and release 3.25 ODOR Rating 3 max
42、 (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 meeting the requirements of this specification. Contact for questions con
43、cerning 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 be checked for compatibility with WSS-M4G318-A production material. 4.2 STO
44、RAGE 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 REFERENCE 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 2011 07 13 Added Odor Requirement. Editorial changes for clarification.
