1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 08 29 Activated J. Crist Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 5 SEALER, HEAT EXPANDING, ANTI-FLUTTER WSS-M4G183-D 1. SCOPE The materials defined by this specification are pre-formed, low
2、-expansion, anti-flutter materials. 2. APPLICATION This specification was released originally to isolate sheet metal components, such as roof bow to roof bow. These materials are designed to be applied over oily metal substrates and expand and cure in the e-coat oven. The material is normally held i
3、n position with mechanical fasteners. Anti-flutter materials are required to perform in a number of applications and closure designs. Each design and/or application has unique requirements. Compliance with this material specification does not guarantee the anti-flutter will function for all potentia
4、l applications on a vehicle. Selection of the appropriate material should therefore be based on jury evaluations or other NVH test procedures as well as the required functional trial. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must confor
5、m to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 MANUFACTURING REQUIREMENTS 3.2.1 Electrocoat Compatibility (FLTM BV 119-01, use current production paints as identified by the Materials Engineering Activity) Shall not contaminate electrocoat primer bath or cause
6、 electrocoat film irregularities 3.2.2 Wash Resistance (FLTM BV 116-01, Method B, material thickness as defined on the engineering drawing) No measurable dissolution or evidence of material wash-off 3.3 ENGINEERING REQUIREMENTS 3.3.1 Specific Gravity (uncured material), kg/L +/- 0.1 (ASTM D 297, wat
7、er displacement method; ref. para 5.2) The specific gravity tolerance for any one supplier shall be +/- 0.1 based on the recorded specific gravity of their originally approved production sample. ENGINEERING MATERIAL SPECIFICATIONWSS-M4G183-DPrinted copies are uncontrolled Copyright 2003, Ford Global
8、 Technologies, Inc. Page 2 of 5 3.3.2 Volatile Organic Compounds (VOC) Content, 0.05 kg/L, max (EPA Method 24, Procedure B) 3.3.3 Water Absorption, max. 5% (FLTM BV 117-01, Method A, 8 h soak time use samples prepared in para 5.2 at minimum bake only) 3.3.4 Cure Requirements Report (Define the proce
9、ss cure window for adhesive cure, report minimum and maximum time at temperature requirements to achieve performance.) Performance shall include, but is not limited to, the following: Volume expansion, para 3.3.7 Peel Adhesion, para 3.3.8 3.3.5 Dimensions as specified on engineering drawings 3.3.6 F
10、ogging (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 70 Formation of clear film, droplets or crystals is cause for rejection. 3.3.7 Volume Expansion (FLTM BV 108-02, except use die cut material W x Y x Z mm in place of semi-circular bead.
11、Bake schedules para 5.2) 3.3.7.1 Minimum bake 200 - 450% 3.3.7.2 Maximum bake 200 - 450% 3.3.8 Peel Adhesion (ASTM D 1876, substrates per para 5.3, material cure per para 5.2, 76.2 mm overlap, 2.0 +/- 0.4 mm adhesive bondline, condition for 30 minutes at specified 23 +/- 2 C prior to test.) All mate
12、rials shall show 100% cohesive failure; report failure mode. 254 mm/min. pull rate. Report load between 25 and 75 mm cross-head travel. Normal, unexposed 0.5 N/ mm Salt Spray 0.5 N/mm (ASTM B 117, 500 h) There shall be no corrosion beneath original material contact area ENGINEERING MATERIAL SPECIFIC
13、ATIONWSS-M4G183-DPrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 3 of 5 After APG cycles 0.3 N/mm (FLTM BI 120-01) There shall be no corrosion beneath original material contact area Report after 10, 20 and 30 cycles One APGE cycle: 15 min salt water immersion (5%
14、salt solution) 1 h at 45 min drip dry at 23 +/- 2 C 22 h at 50 +/- 2 C and 90% +/- 5% RH Samples are to remain in the 50 +/- 2 C and 90% +/- 5% environment over the weekends and holidays. 3.3.9 Bridging, max. 2.5 mm Test method: Position a 150 x 2.5 x 0.5 mm strip of material over the holes in the f
15、ixture shown in Figure 1. Prepare two assemblies and condition at 23 +/- 2 C for 1h. Subject one assembly to each material cure schedule per para. 5.2 Use 0.8 - 0.9 mm thickness CRLC. Figure 1: Bridging Test Apparatus 3.3.10 Low Temperature Resistance No loss of adhesion There shall be no loss of ad
16、hesion after the test assemblies are subjected to FLTM BV 101-02, Procedure E modified as follows ENGINEERING MATERIAL SPECIFICATIONWSS-M4G183-DPrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 4 of 5 Test Method: Prepare two test samples as shown in Fig. 2 Cure one
17、 sample at each of the bake schedules indicated in para. 5.2. Cure samples in a horizontal position. Condition samples at 23 +/- 2 C for a minimum of 24 h. Place two test assemblies and cold slam apparatus described in FLTM BV 101-02 in a cold box and condition at - 40 +/- 1 C for a minimum of 4 h.
18、Individually mount panels on the cold slam apparatus with cured material at bottom side facing away from fixture. Slam per FLTM BV 101-02 at - 40 +/- 1C Condition panels at 23 +/- 2 C for a minimum of 1 h. Examination of samples shall indicate no loss of adhesion of the sealer from the substrate ben
19、eath original material contact area. 3.3.11 Sponge and Cell Structure After Cure Shall exhibit uniform cell structure with no large voids. A natural skin formation shall result from the cure cycle. Test Method: Cross sectional observation of the sponge shall be made by cutting through the skin and s
20、ponge mass of a cured specimen. The sponge system shall be visually examined. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. COLOR (originally approved material) Dark gray 4.1 MATERIAL CURE SCHEDULES
21、Minimum Bake: 171 C metal temperature for 10 minutes (not to exceed 20 minutes oven time) Maximum bake: 205 C metal temperature for 30 minutes (not to be less than 40 minutes oven time) 4.2 SUBSTRATES 4.2.1 HDG Steel 0.76 mm thickness; surface pre-coated with mill oil at an application of approximately 2.2 cm3/m2- HDG (G60G/60G), clean, unpolished. ENGINEERING MATERIAL SPECIFICATIONWSS-M4G183-DPrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 5 of 5
