1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 03 2016 02 02 Revised See Summary of Revisions for Details C. Taylor, NA / Global Team 2014 07 16 Editorial Corrected paragraph number in 3.7.9 M. Corley, EU 2007 07 31 Activated J. Robincheck Controlled document at www.MATS Copyright 20
2、16, Ford Global Technologies, LLC Page 1 of 14 PAINT, ONE COMPONENT ELASTOMERIC BASECOAT/CLEARCOAT WSS-M16J20-A1 OVER FLEXIBLE SUSTRATES, EXTERIOR PAINT, TWO COMPONENT ELASTOMERIC BASECOAT/CLEARCOAT WSS-M16J20-A2 OVER FLEXIBLE SUSTRATES, EXTERIOR PAINT, ONE COMPONENT BASECOAT/TWO COMPONENT CLEARCOAT
3、 WSS-M16J20-A3 OVER FLEXIBLE SUSTRATES, EXTERIOR 1. SCOPE The materials defined by these specifications are elastomeric paints, which consist of a basecoat and clear topcoat applied by a baked process. This specification also includes unique colors that require Tri or 4 coat systems. Tricoat colors
4、consist of a pigmented groundcoat followed by a non-hiding midcoat over which is applied a clear or tinted clear. Four coat systems consist of a basecoat, clearcoat baked then the application of an effect basecoat with a clear or tinted clear. 2. APPLICATION These specifications were released origin
5、ally for paints used as the final topcoat on exterior trim components made of flexible substrates, such as fascia, bumpers, lip moldings, appliqus, cladding, bodyside moldings. It shall be satisfactory for use over specified primers or over previously baked enamel, as in paint repair or tutone opera
6、tions. 2.1 LIMITATIONS Bake temperature should not exceed softening temperature of substrate material as agreed upon by Ford Materials Engineering. 3. REQUIREMENTS Testing to be used for initial qualification of materials and shall be made on the basis of comparison with approved production material
7、, chosen by the approving materials engineer. 3.1 APPROVED SOURCES This specification requires the use of approved 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 appro
8、ved sources is located within Ford at or available externally through a Ford Materials Engineer. 3.2 COMPOSITION Both the basecoat and clearcoat shall contain UV absorbers. The supplier will furnish the specific composition and concentration of the absorbers upon request. 3.2.1 Resin Shall be eithe
9、r a polyester, acrylic, modified urethane polymer or a polyurethane. Minor amounts of modifiers and/or plasticizers are allowed. ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 2 of 14 3.2.2 Pigments Pigments are exterior automotive grade sel
10、ected to match the Ford Motor Company master and meet the durability requirements. 3.2.3 Solvents The volatility of solvents will be such that there shall be no paint sagging, roughness or dry spray at specified film thicknesses. Solvents shall be compliant with any regional requirements (HAPs, etc.
11、). 3.3 PHYSICAL PROPERTIES LIQUID STATE The following evaluation must be conducted on both the basecoat and clearcoat at application viscosity. Throughout the application viscosity range, material shall be in compliance with local emission regulations. Property variation acceptability as identified
12、below, shall be based on the recorded values of the originally approved production sample as approved by Ford Materials Engineering. This data will be used in developing control plan requirements. 3.3.1 Non-Volatile Content, range Initial sample +/- 4% (ASTM D 1353) 3.3.2 Volatile Organic Compound,
13、range Initial sample +/- 1% (ASTM D 3960) 3.3.3 Weight per Volume, range Initial sample +/- 0.03 g/ml (ASTM D 1475) 3.3.4 Volume Solids, range Initial sample +/- 2.0% (ASTM D 2697) 3.3.5 Viscosity Report (ASTM D 1200) 3.3.6 Stability No more than 30% (ASTM D 1849) viscosity increase permitted. 3.3.6
14、.1 Shelf Stability, 90 days 3.3.6.2 Accelerated Stability, 60 C, 16 h 3.3.7 Resistivity 0.005 to 2.00 megohms (ASTM D 5682) Volatile solvents and other components affecting electrical conductivity shall be adjusted such that the resistivity at application viscosity shall be within specified limits.
15、ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 3 of 14 3.4 PREPARATION OF TEST PANELS 3.4.1 Substrates Flexible polymers and flexible polymer blends, PU, PP, TEO, etc. 3.4.2 Substrate Condition The surface to be coated must be cleaned to ens
16、ure the absence of oil or alkaline residues, fingerprints, corrosion, mold release agents, dirt, moisture, and other foreign materials. Surface energy/resistivity or chemical reaction(s) enhancements (flaming, corona discharge or plasma) and/or addition of conductive materials, necessary to meet the
17、 requirements of this specification, shall be approved by Materials Engineering and noted on the Ford Approved Source List (ASL) and/or Material Color Durability Compliance Certification (MCDCC). 3.4.3 Adhesion Promoter Apply 6-16 m DFT (Dry Film Thickness) of the primer or as otherwise recommended,
18、 as specified for the substrate. 3.4.4 Basecoat/Clearcoat Apply basecoat to required dry film thickness by spray under conditions appropriate for basecoats, and flash as required. Apply clearcoat to required dry film thickness. Bake using appropriate bake schedule. Record paint and oven type used. (
19、As developed by para 3.5). 3.4.5 Design Verification/Initial Qualification Test Requirements as listed in Table 1. 3.4.6 Aging After application of the top coat, all panels shall be aged at least 72 h at 23 +/- 2 C (preferred) or 16 hours at 45 +/- 1 C before testing. 3.4.7 Cure Process Window Must
20、be developed per paragraph 3.5. ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 4 of 14 3.5 PROCESS WINDOW DEFINITION - NEW RESIN TECHNOLOGIES ONLY The supplier shall perform a DOE utilizing response surface analysis to determine the Process
21、Window of the system. The three variables to be included in the design are Bake Time, Bake Temperature, and Film Thickness. An initial screening experiment should be run to determine what level will generate a window which includes testing to failure. This screening experiment should be reviewed wit
22、h the Materials Engineer to set up the final DOE. The DOE shall include, but is not limited to, the conditions in paragraph 4.4. Response attributes to the DOE should be based on the materials tested and should include, but not be limited to: Film Thickness (Para 3.6.3, 3.6.4) Ultraviolet Light Tran
23、smittance (Para 3.6.5) Adhesion (Para 3.7.1) Water Immersion (Para 3.7.2) Chipping (Para 3.7.8) Environmental Cycling (Para 3.7.9) High Performance Adhesion (Para 3.7.10) Adhesion after Repairs (Perform Para 3.7.1 on panel coated to Para 3.6.4) Report minimum, maximum, and target values for time, te
24、mperature, and film thickness. 3.6 FILM PROPERTIES 3.6.1 Color (FLTM BI 109-01, SAE J1545 Three Angle CMC) Shall match the Master Approved Sample color panel or the initial sample as approved by Design Center. 3.6.2 Gloss (FLTM BI 110-01, ASTM D 523) Shall match the Master Approved Sample color pane
25、l or the initial sample as approved by Design Center. Gloss A: 20 Glossmeter min 92 B: 60 Glossmeter 76 - 84 C: 60 Glossmeter 66 - 74 D: 60 Glossmeter 58 - 66 E: 60 Glossmeter 47 - 53 F: 60 Glossmeter 33 - 38 G: 60 Glossmeter 17 - 23 H: 60 Glossmeter 7 - 13 J: 60 Glossmeter 4 - 6 K: 60 Glossmeter 2
26、- 4 L: 60 Glossmeter 0.5 - 2.0 N: 60 Glossmeter 1.8 - 2.4 R: 60 Glossmeter 1.2 1.6 3.6.2.1 Gloss After Rebake 4 unit decrease max Rebake panel at target bake conditions per Para 3.5. ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 5 of 14 3.6
27、.3 Film Thickness (ASTM B 487, minimum of 400x magnification) Targeted Film Thickness: These ranges are considered to be requirements unless otherwise supported by testing data agreed to by Materials Engineering. Adhesion Promoter 6-16 m Basecoat/Clearcoat 15-30 m /38-50 m Tricoat (Basecoat/Midcoat/
28、Clearcoat) 20-30 m /15-30 m /38-50 m 4 Layer (Base/Clear/Base/Clear) Values other than the above Target values shall be defined from process window (Para 3.5). If values do not meet the requirements listed here, they should be noted on the Material Color Durability Compliance Certification (MCDCC).
29、3.6.4 Film Thickness(Repair) Not to exceed (ASTM B 487, minimum of 400x magnification) 230 micrometers There shall be no more than 2 in-department repairs. 2 in-department repairs = 1st run part + 1 in line repair. 3.6.5 Ultraviolet Light Transmittance For each color, report the minimum film build o
30、f basecoat and of clearcoat over epoxy-free spray primer required to meet a maximum light transmission of no more than 0.1% at 360 nm and 0.5% at 400 nm. Fortified (with UV package) clearcoat can be used for this evaluation. The equipment used for this measurement is an integrating sphere spectropho
31、tometer or equivalent. These values shall be used to help determine minimum film thickness for the process window in section 3.5. 3.6.6 General The paint shall bake out to a presentable serviceable film showing no craters, pinholes, seediness, abnormal roughness or excessive metallic mottling. It sh
32、all have a reasonable tolerance for ordinary cleaning, and exhibit no dulling or color change when washed with commercially available cleaners. 3.7 RESISTANCE PROPERTIES 3.7.1 Paint Adhesion Less than 5% paint (FLTM BI 106-01, Method D, knife blade) removal of any paint layer with no complete diamon
33、ds removed. Lightly hand sand paint film surface (10 double rubs, moderate pressure) with P600 paper until dull, before scribe operation and checking adhesion. 3.7.2 Water Resistance No blistering, dulling, (FLTM BI 104-01, 240 h) softening, loss of adhesion, and/or any other film failure Adhesion s
34、hall be tested according to Para 3.7.1 within 30 minutes after removal from water. ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 6 of 14 3.7.3 Hydrolysis Resistance Rating 4-5 min (FLTM BI 106-03, 28 days AATCC Evaluation Procedure 1/ISO 10
35、5-A02) Test samples at 14 days and 28 days exposures and must meet the Adhesion testing performance requirements per Para 3.7.1. If an adhesion failure is detected, recheck sample in a different area to verify. Test within 60 minutes of removal. If failure occurs, retest in another area after 24 hou
36、rs to verify. 3.7.4 Fluid Spotting Resistance Rating 4 5 min (FLTM BI 168-01, Method A and B, AATCC Evaluation Procedure 1/ISO 105-A02) Test Fluids: (Body and Exterior Trim use) No color dulling, surface distortion or permanent softening permitted. After exposure, adhesion testing performance must b
37、e met per Para 3.7.1 within 60 minutes after exposure. 3.7.5 Resistance to Acid Spotting Rating 4 5 min (FLTM BI 113-02, AATCC Evaluation Procedure 1/ISO 105-A02) No color dulling, surface distortion or permanent softening permitted. After exposure, adhesion testing performance must be met per Para
38、3.7.1 within 60 minutes after exposure. 3.7.6 Mar Resistance A & B Gloss Materials 70% Gloss retention (FLTM BI 161-01) No visual Mar at all angles 3.7.7 Scratch Resistance (FLTM BO 162-01, 1.0 +/- 0.1 mm steel ball at 7.0 N, 6.0 N, 4.5 N, 3.0 N and 2.0 N) Scratch at 2N load: Rating 2 max Marring at
39、 2N load: Rating 2 max No Whitening or color change at any angle Whitening/Color Change at 7N load: Rating 1 max ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 7 of 14 3.7.8 Chip Resistance 3.7.8.1 Grit Blast, Split Shot Rating 4 min (FLTM B
40、I 157-06) 3.7.8.2 Stone Chip (SAE J400, 1.4 L at -20 +/- 2 C, 1.4 L at 23 +/- 2 C, and 4.7 L at 23 +/- 2 C) Topcoat systems to be tested will include: first run panel, 1.4 L Rating 5B or 97% paint retention no chips 3 mm Dia first run panel, 4.7 L Rating 4B or 95% paint retention, no chips 3 mm Dia
41、first run plus two in-line repairs, 1.4 L only Rating 3B or 93% paint retention no chips 3 mm Dia Chipping is identified as intercoat adhesion loss between any adjoining layers revealing dis-similar colors, scuffing is acceptable. Chipping metrics may be obtained by image analysis software if availa
42、ble. For 2k clearcoats, apply repairs at the maximum recommended amount of time after the original coat for good performance. Note the amount of time used on the test data. 3.7.9 Environmental Cycling, 15 cycles Rating 4-5 min (FLTM BQ 104-07, Procedure 1 or 10, evaluate after 20 h at 23 +/-2 C) AAT
43、CC Evaluation Procedure 1/ISO 105-A02 No evidence of cracks, no blistering, no change in appearance or other failure when compared with an original part. After exposure, adhesion testing performance must be met per Para 3.7.1 within 60 minutes after exposure. For procedure 1, test pieces shall be ma
44、intained at 38C +/-2 C and 95-98% RH during any weekend break in cycling. ENGINEERING MATERIAL SPECIFICATION WSS-M16J20-A1/A2/A3 Copyright 2016, Ford Global Technologies, LLC Page 8 of 14 3.7.10 High Performance Adhesion Thermal Shock Rating 20 max (FLTM BI 107-05) Alternate Method Resistance Agains
45、t High Pressure Cleaner 2 mm2 max (FLTM BO 160-04, Method B & Method C) For Method B prior to testing the painted surface shall be X-scribed through to the substrate (30 angle). The test must be performed on the X-scribe. For Method C prior to test run Split Shot per FLTM BI 157-06 (1st shot only) t
46、hen run test at 23C, no X-scribe. The test method must be noted in initial submission package 3.7.11 Heat Resistance Rating 4 5 min (7 days at 80 +/- 2 C, AATCC Evaluation A & B gloss surfaces: Procedure1, ISO 105-A02) 90) 57 / 44 62 / 49 50 / 37 Medium Metallic (L15 50-89) 60 / 47 65 / 52 53 / 40 D
47、ark Metallics (L15 75) 62 / 49 67 / 54 55 / 42 Medium Solids (L15 30-75) 65 / 52 70 / 57 58 / 45 Dark Solids (L15 30) 67 / 54 72 / 59 60 / 47 4.3 TOPCOAT PROCESSING CONDITIONS REQUIRED FOR PARA 3.5. Topcoat Bake Bake Conditions Filmbuild Time Temperature 1 Low Max Max 2 High Min Min 3 Target Target
48、Target Note 1: Control testing panel requirements to be chosen at discretion of approving materials engineer. Note 2: Testing of one specimen is required of every color per each condition listed above. 4.4 INFORMATION REQUIRED FOR SUBMITTAL TO FORD MOTOR COMPANY (New Technologies Only) Test data per
49、 specification Control plans PFMEA/DFMEA Process window (cure window) Product Data Sheets (TSB) Description of manufacturing process Internal test capabilities MSDS/SDS 4.5 APPROVAL OF MATERIALS Suppliers desiring approval of their materials shall first obtain an expression of interest from Purchasing, Design or Product Development, and Materials Engineering. The supplier shall submit a completed copy of their laboratory test
