1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 1 2011 07 13 Revised Odor Requirements added W. Janitschke, FoE 2007 05 22 Activated W. Janitschke/B. trecht Controlled document at www.MATS Copyright 2011, Ford Global Technologies, LLC Page 1 of 6 SEALER, POLYVINYL CHLORIDE (PVC), SPRA
2、YABLE, PRIMER OVEN WSS-M4G295-A CURING, CHIP RESISTANT, IMPROVED PAINTABILITY 1. SCOPE The material defined by this specification is a solvent release, heat curing, stone peck resistant PVC sealer for exterior body areas. 2. APPLICATION This specification was released originally for material used as
3、 a stone peck protective coating over baked electrocoat on the lower body side of passenger cars 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 without pre-gell
4、ing 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 and must confor
5、m 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 test panels, E-coated according to FLTM BI 120-01. The sealer must be applied on the cured E-coated test panel within 30 minutes after oven
6、 curing. 3.2.2 Use paint-materials and curing conditions according to (a) Primer ESK-M6J151-A Minimum: 5 min. 165 C Maximum: 5 min. 190 C (b) Clearcoat WSK-M32J125-A Minimum: 10 min. 130 C Maximum: 10 min. 140 C 3.3 COLOR Grey 3.4 SOLIDS 94% min (FLTM BV 150-10) 3.5 ASH 28% max (FLTM BV 150-10) ENGI
7、NEERING MATERIAL SPECIFICATION WSS-M4G295-A Copyright 2011, Ford Global Technologies, LLC Page 2 of 6 3.6 DENSITY at 23 C 1.34 kg/L max (ASTM D 1475) 3.7 VISCOSITY at 23 C (Rotational Rheometer i.e. Bohlin) (Tempering Time: 300 s Pause Interval: 180 s at 131 1/s Downward Measure: 131 1/s - 20 1/s in
8、 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) 3.8 SURFACE CONDITION AFTER AGING (120 h at 80 +/- 2 C) After curing the material shall be dry to touch after cooling to 23 +/- 2 C. It sh
9、all be free from cracks or bubbles and shall show a uniform paint film without staining or discoloration. After 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. Panel-Preparation: - C
10、oat the E-coated according panels 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 3.2.2
11、) - 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 +/
12、- 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 AF
13、TER 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) ENGINEERING MATERIAL SPECIFICATION WSS-M4G295-
14、A Copyright 2011, Ford Global Technologies, LLC Page 3 of 6 3.11 ADHESION (only E-Coat/Sealer) The 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 par
15、a 3.2.2) a dry coating thickness of 500 micrometer, beginning at one edge of the test panel and tapering 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 ed
16、ge with the lowest film thickness. 3.12 ABRASION RESISTANCE (ASTM D 968) There shall be no exposed 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 Panel Preparation
17、: - 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 se
18、parately 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 mech
19、anical 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 used
20、. - 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 Han
21、au ENGINEERING MATERIAL SPECIFICATION WSS-M4G295-A Copyright 2011, Ford Global Technologies, LLC Page 4 of 6 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 an
22、y evidence of loss of adhesion of the material. Panel-Preparation according to para 3.8, except sealer-thickness 500 micrometer min. Test-Method: - For Cold Rolled Steel: After 24 h at 23 +/- 2 C expose test assemblies to a salt spray fog according to ASTM B 117 for 480 h. - For Precoated Steel: Aft
23、er 34 h at 23 C +/- 2 C expose test assemblies to a Scab Corrosion Test (FLTM BI 123-01, without scribe) for 50 cycles. 3.14 FLOW RATE 2 mm max (FLTM BV 151-03) Test panels (para 3.2.1) shall be coated with the material in such a manner (airless), that a wet film thickness of 500 micrometer is obtai
24、ned. 3.15 COMPATIBILITY WITH PRODUCTION PAINTS No tackiness of material surface, no cracking or 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 outli
25、ned 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 Determination of Discoloration After Aging
26、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. ENGINEERING MATERIAL SPECIFICATION WSS-M4G295-A Copyright 2011, Ford Global Technologies, LLC Page 5 of 6 3.15.3 Deter
27、mination 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, Florida area for 6 months and 1 year at 5 to the south. - Prior to examination clean specimens using soap
28、and water. 3.16 TEMPERATURE CYCLING TEST No chipping, flaking, 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
29、C 16 h at 38 +/- 2 C and 98 +/- 2% R.H. - 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 (para 3.2.1) shall be coated with the materia
30、l 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“ according to FLTM BV 150-05, Table 2. 3.18 ABRASIVE
31、S 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 the glass plates shall b
32、e considered failure. ENGINEERING MATERIAL SPECIFICATION WSS-M4G295-A Copyright 2011, Ford Global Technologies, LLC Page 6 of 6 3.19 FLASH POINT 100 C min (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
33、 in writing that each separate volatile ingredient has a flash point greater than 100 C. 3.20 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 clog
34、ging or fluctuations in the spray pattern and with a min spray back and fogging. The coating shall not exhibit craters, pinholes, sags, abnormal waviness or other objectionable appearance conditions. 3.21 QUALITY The material shall be of uniform quality, free from foreign material and properties det
35、rimental to normal production use. 3.22 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 Engineering prior to ma
36、terial approval and release 3.23 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 This information given below is provided for clarification and assistance in meeting the requirement
37、s of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 COMPATIBILITY Any other underbody coating, applied to the production material WSK-M4G295-A as an additional coating either for the purpose of repair or for other reasons, must be checked for compatibi
38、lity with WSK-M4G295-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 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.
