1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2016 10 03 N Status No replacement named S. Short, NA 2004 03 11 Activated M. Mehandru Copyright 2016, Ford Global Technologies, LLC Page 1 of 5 SEALER, HOT MELT, PREFORMED, PAINTABLE WSB-M4G331-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The m
2、aterial defined by this specification is an extruded ethylene copolymer base hot melt sealer. 2. APPLICATION This specification was released originally for material used to seal floor pan holes after vehicle electrocoat. The material can be heat staked to a metal clip which is inserted into the floo
3、r pan hole. It is suitable for use on the vehicle interior and is paintable with topcoat enamels presenting an acceptable appearance free from tackiness, checks and porosity. This material is not recommended for visible areas. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Materi
4、al suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). Part producers using this material 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 re
5、levant Materials Activity. 3.2 DIMENSIONS As specified on engineering drawing and/or in Trim and Sealer manual 3.3 CONSISTENCY (Needle Penetration) (ASTM D 1321, 100 g total load, ref. para 4.3) 3.3.1 As Received 3.3.2 Aged, 72 h at 50 C The consistency tolerance for any one supplier shall be +/- 1.
6、0 mm based on the recorded consistency of their originally approved production sample. 3.4 SOLIDS, min 98% (ASTM D 2834, except heat at 102 +/- 3 C for 3 h in a mechanical convection oven) 3.5 ASH (Based on solids weight) +/- 5% (Ref. para 4.4) (ISO 3541, Method A, 760 +/- 30 C) ENGINEERING MATERIAL
7、 SPECIFICATION WSB-M4G331-A2 Copyright 2016, Ford Global Technologies, LLC Page 2 of 5 3.6 SPECIFIC GRAVITY (Uncured material) (ASTM D 297, water displacement method; ref. para 4.5) The specific gravity tolerance for any one supplier shall be +/- 0.1 based on the recorded specific gravity of their o
8、riginally approved production sample. 3.7 MANDREL BEND TEST at 23 +/- 2 C No loss of adhesion (FLTM BV 122-01, material bake schedule per para 4.6, heat age test specimen 14 days at 70 +/- 1 C before test, substrate per para 4.2) 3.7.1 Test at 23 +/- 2 C 3.8 FLOW PROPERTIES, max Vertical Horizontal
9、2 mm 2 mm Test Method: . Apply an extruded section of sealer 150 x 25 x 2.0 +/- 0.1 mm to the centerline of two 300 x 100 x 0.90 mm electrocoated steel panels per para 4.2. Preheat the panels for 15 minutes at 110 +/- 2 C prior to sealer application. This will heat stake the sealer to the panel. All
10、ow the panels to cool at 23 +/- 2 C for 30 minutes. . Place the electrocoated panels in a mechanical convection oven for 15 minutes at 150 +/- 2 C. Place one panel at a 45 angle with the 150 mm dimension of sealer in a horizontal attitude and the second panel in a horizontal position (flat). . Remov
11、e panels from oven, cool, and measure the amount of flow. Save panels for para 3.10. 3.9 SHEAR ADHESION, min. 1.5 MPa and 100% (SAE J1523, 0.75 mm bondline thickness, cohesive failure 6.5 cm2 overlap, substrate per para 4.2, 25 mm/min crosshead speed, material cure per para 4.6.1) 3.10 LOW TEMPERATU
12、RE RESISTANCE No adhesion failure (FLTM BV 101-02) Place the panels prepared in para 3.12 in the slamming apparatus. Condition 4 h at - 30 +/- 2 C. The panel shall be slammed a total of six times. ENGINEERING MATERIAL SPECIFICATION WSB-M4G331-A2 Copyright 2016, Ford Global Technologies, LLC Page 3 o
13、f 5 3.11 ADHESION Shall not be removed in a continuous coherent film when subjected to the following environments. 3.11.1 Normal, 24 h at 23 +/- 2 C 3.11.2 30 APGE Cycles (FLTM BI 123-01, modified cycle, substrates per para 4.2, oven cure per para 4.6, report after 10, 20 and 30 cycles) 3.11.3 Therm
14、al Cycle . 4 h at 90 +/- 2 C . 4 h at 38 +/- 1 C and 95 - 100% relative humidity . 16 h at - 30 +/- 1 C . 4 h at 38 +/- 1 C and 95 - 100% relative humidity . 4 h at 90 +/- 2 C . 16 h at - 30 +/- 1 C Sample preparation: SAE J1600, Method B, with the following modifications: . Apply a 75 x 200 mm ribb
15、on of material along the center line of two electrocoated steel panels prepared per para 4.2. . Cure the material per bake schedules in para 4.6. . Report failure mode. 3.12 COMPATIBILITY WITH PRODUCTION PAINTS No tackiness, staining, discoloration, pinholing from sealer outgassing or other deleteri
16、ous effects on topcoats. Note: Evidence of any defects as stated above shall be reviewed with Global Paint Engineering and AVT Materials Engineering. Test Method: . Apply a 25 x 200 x 2 mm strip of material to an electrocoated steel panel per para 4.2 and bake per para 4.3.1. Cool the panel for 1 h
17、at 23 +/- 2 C and bake at 135 +/- 2 C for 8 min metal temperature. Cool panel for 1 hr. . Apply a 0.013 mm film of white basecoat to the panel and bake at 130 +/- 2 C for 10 min metal temperature. Repeat the procedure with a red basecoat. . With moderate pressure, touch the painted sealer with a whi
18、te cotton swab. Examine the panel for transfer of fibers or paint. . Expose the panel for 2 weeks at 82 +/- 2 C. Examine for evidence of discoloration. ENGINEERING MATERIAL SPECIFICATION WSB-M4G331-A2 Copyright 2016, Ford Global Technologies, LLC Page 4 of 5 3.13 FOGGING (SAE J1756, 3 h at 100 C hea
19、ting, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 60 Formation of clear film, droplets or crystals is cause for rejection. 3.14 STORAGE STABILITY The material shall be stored at temperatures below 40 C away from all sources of heat and sunlight. Heat greatly accelerates
20、aging. Under these storage conditions, the shelf life of the material shall be 3 months. When these materials are stored at temperatures below 23 C, they shall be conditioned at room temperature prior to application. Adequate conditioning permits the material to obtain its optimum application proper
21、ties. Material may not be used after the expiration date unless the supplier has given written documentation to Materials Engineering and the affected Manufacturing Plant that the material conforms to requirements outlined in the material control plan. The supplier shall also indicate in the letter
22、the number of additional days the material will be usable. 3.15 QUALITY Material shall be a homogeneous product. It shall be consistent in color and texture, and free from objectionable odors during normal storage. It shall be suitable for the intended application. 3.16 FUNCTIONAL APPROVAL Materials
23、 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 and Design Engineering. Results shall be made available to Materials Engineering prior to material approval and release. 4. GENER
24、AL INFORMATION The information below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 MECHANICAL CONVECTION OVEN The mechanical oven(s) used to cure the material shall be capable of obtaining 205 C metal temperature on body steel (0.8 - 0.9 mm thick
25、ness) within 8 - 10 minutes. 4.2 SUBSTRATES Electrocoat primed steel panel 100 x 300 x 0.80 mm prepared per ESB-M2P4 performance specification. Use current production paints as identified by the Body Engineering Materials Office. ENGINEERING MATERIAL SPECIFICATION WSB-M4G331-A2 Copyright 2016, Ford
26、Global Technologies, LLC Page 5 of 5 4.3 CONSISTENCY, Typical 1.6 mm 4.4 ASH CONTENT, Typical 45% based on solids weight 4.5 SPECIFIC GRAVITY, Typical 1.3 4.6 BAKE SCHEDULES 4.6.1 Primer Bake Schedule Minimum Bake 8 minutes at 135 +/- 2 C metal temperature, total oven time - maximum of 15 minutes at
27、 135 +/- 2 C Maximum Bake 20 minutes at 177 +/- 2 C metal temperature, total oven time - minimum of 30 minutes at 177 +/- 2 C 4.6.2 Topcoat Bake Schedule Low (minimum) Bake 10 minutes at 124 +/- 2 C metal temperature, total oven time - maximum of 17 minutes at 124 +/- 2 C High (maximum) Bake 23 minutes at 143 +/- 2 C metal temperature, total oven time - minimum of 30 minutes total oven time at 143 +/- 2 C
