1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 0 2012 04 04 Activated Replaces WSS-M18P11-A2 B. Witkowski, NA Controlled document at www.MATS Copyright 2012, Ford Global Technologies, LLC Page 1 of 4 SEALER, PREFORMED PART, PAINT SHOP CURING WSS-M18P11-B3 PERFORMANCE REQUIREMENTS 1.
2、SCOPE This specification defines the performance requirements for a die cut or extruded sealer that expands upon exposure to heat and can be used in applications for sealing on electrocoat surfaces and cured through paint process ovens. 2. APPLICATION This specification was released originally for m
3、aterial used in the paint shop area for sealing openings in sheet metal surfaces. The material can be supplied with or without an aggressive pressure sensitive adhesive which promotes adhesion to electrocoat primed substrates. The material may expand during the primer or enamel bake schedules noted
4、in the specification. Materials meeting this performance specification are identified on the corporate Approved Source List (ASL). Compliance with this performance specification does not guarantee the sealer will function for all potential applications on a vehicle. 3. REQUIREMENTS 3.1 STANDARD REQU
5、IREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements for Production Materials (WSS-M99P1111-A). 3.2 SYSTEM COMPATIBILITY Initial material approval was based on a specific material system which included the substrate, e-coat system
6、, and adhesive/polymer. The originally approved material system was oven cured using specific production process parameters. The choice of substrates, e-coat system, assembly plant processing conditions and specific design application may affect adhesive /polymer / engineered part performance. Manuf
7、acturing conditions vary regionally such as paint cure conditions and the applicable regional test protocol should be run for material approval. If any of these parameters are changed, the material performance must be validated using the new parameters. 3.3 DIMENSIONS Cross sections/dimensions for t
8、ape shall be specified on the engineering drawing. 3.4 MATERIAL PROPERTIES 3.4.1 Density +/- 0.1 kg/m3 (ISO 845/ASTM D 3574,Test A, interior density) The density variation for any one supplier shall be +/- 0.1 kg/m3, based on the recorded density of their original approved production sample. ENGINEE
9、RING MATERIAL SPECIFICATION WSS-M18P-B3 Copyright 2012, Ford Global Technologies, LLC Page 2 of 4 3.4.2 Water Absorption (FLTM BV 117-01, Method A, 8 h soak time, cure material per paragraph 4.2) 0- 300% Volume expansion 4 % max 300 800% Volume Expansion 5 % max 800% or greater Volume Expansion 8 %
10、max 3.4.3 Volume Expansion Report (FLTM BV 108-02, material cure per para 4.2) The volume change variation for any one supplier shall be +/- 10%, based on the recorded volume change of their original approved production sample. 3.4.4 Volatile Organic Compounds (VOC) Content +/- 0.05 kg/L (EPA Method
11、 24, Procedure B) The VOC Content variation for any one supplier shall be +/- 10%, based on the recorded VOC Content of their original approved production sample. 3.4.5 Cure Requirements Report (Define the process cure window for material cure. Report minimum and maximum time at temperature requirem
12、ents to define performance boundaries) Critical performance characteristics shall include, but are not limited to, the following: Volume Expansion, para 3.4.3 Adhesion para 3.5.2 3.5 MANUFACTURING PROPERTIES 3.5.1 Differential Scanning Calorimetry Report onset of (20 +/- 1 mg sample size, 5 C/min re
13、action heating rate, 25 - 250 C temperature range, submit Heat Flow vs. Temperature curve) 3.5.2 Adhesion Characteristics 3.5.2.1 Cured: Test Method: Apply two 200 mm length ribbons of material to each of two 0.89 x 100x 300 mm steel per para 4.1 and condition panels at 23 +/-2 C for 1 h. Bake on pa
14、nel at min and max bake per para 4.2. Position panels in a horizontal attitude during bake. After bake, condition panels at 23 +/-2 C for 4 h min. Evaluate adhesion by inserting the top of a sharp spatula under the end of the material strip. Grasp the tab of sealer and attempt to peel 180.The materi
15、al shall not be removable in a continuous coherent film. Observe for any indication that the material fails to adhere to the substrate or is brittle. ENGINEERING MATERIAL SPECIFICATION WSS-M18P-B3 Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 3.5.2.2 Uncured Adhesion (PSA/Tacky only) Tes
16、t Method: Prepare four panels for each substrate per para 4.1. Cut four 100 x 150 x 4 mm strips of the material and apply to four 300 x 300 mm panels prepared for each substrate per para 4.1. Pass a 2.2 kg roller over samples per ASTM D 1000. Invert two panels immediately after material application
17、and condition for 72 h at 40 C. Observe for peeling or lifting of adhesive/polymer from panel or slump or sag between attachments, as appropriate. Stand the remaining two panels vertically immediately after material application and condition for 72 h at 40 C. Observe for peeling or lifting of materi
18、al from panel or slump or sag between attachments, as appropriate. 3.5.2.1 Release Paper Adherence and Removal (Pressure Sensitive/Tacky Materials only) The release paper must remain attached to the adhesive/polymer surface during shipment and handling. It must be easily removed from the adhesive/ p
19、olymer without part distortion or paper tear at ambient plant conditions (7 to 38 C). Final approval for the release paper may be part and plant specific. Release paper information shall be noted in the supplier control plan. 3.5.3 Odor (FLTM BO 131-03, for cured samples per 4.2) 3 max Shall be free
20、 from objectionable odors as determined by the manufacturing facility, both as received and after storage. 3.5.4 Storage Stability 6 Months Heat and moisture will accelerate aging. The materials shall be stored in sealed packages (if so recommended by the supplier) away from all sources of heat and
21、moisture. The self life of the material shall be 6 months from date of manufacture when stored at temperatures below 32 C. Ambient plant conditions may fluctuate between 15 C and 38 C. Materials shall be evaluated for local plants conditions to determine plant specific requirements for temperatures
22、in excess of 32 C. Deviations from the shelf life requirement shall be identified and concurred upon by the plant and noted in the supplier control plan. When materials are stored at temperatures below 23 C, they shall be conditioned at room temperature for a minimum of 24 hours prior to application
23、. Application properties are optimized with adequate conditioning of the material Critical performance characteristics to evaluate for shelf life stability shall include, but are not limited to, the following: Volume Expansion, para 3.4.3 Adhesion Characteristics, para 3.5.2 3.5.5 Vertical Expansion
24、 (Ramp Expansion, SAE J1918, Method #3, cure material per para 4.2) 3.5.5.1 Minimum bake Report 3.5.5.2 Maximum bake Report ENGINEERING MATERIAL SPECIFICATION WSS-M18P-B3 Copyright 2012, Ford Global Technologies, LLC Page 4 of 4 3.5.6 Cold Slam Resistance (FLTM BV 101-02, Procedure E, 300 x 300 mm p
25、anel for each substrate per para 4.1,4 mm cured material thickness, condition for 4 h minimum at -40 +/- 2 C prior to testing, test at -40 C for 10 slams) Sample preparation: Apply a 150 x 150 mm piece of material on a 300 x 300 mm panel. Material thickness to be determine by minimum expansion assum
26、ption used for engineering part design. Pass a 2.2 kg roller per ASTM D 1000 over sample within 15 minutes of patch application. Cure between aluminum plates lined with release paper or in a fixture to maintain a 4 mm cured material thickness. 3.5.6.1 Initial 3.5.6.2 Test after 30 days at 50 +/- 2 C
27、 and 90 +/- 5% relative humidity 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 SUBSTRATES Currently released HD, EG, or CRS
28、materials, 0.8mm thickness, electrocoated steel panels prepared per WSS-M3P1-D using current production paints as specified by Materials Engineering. 4.2 MATERIAL CURE SCHEDULES (FLTM BV 150-05, use table for appropriate regional vehicle assembly site, cure material per material paint gel/primer/topcoat conditions for applicable region, condition at 23 +/- 2 C for 1 h min. prior to testing) 5. SUMMARY OF REVISIONS
