1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15979 Sealer, Global, Pumpable, High-flow Roof Ditch - Generic Qualification Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 1 of 11 1 Scope 1.1 Material Description. This specification details the requirements of a
2、paintable, high-flow sealer. The material is applied in the paint shop after the E-Coat bake before primer surfacer and is robotically applied. The material is intended for application to the exterior (horizontal) roof ditch joint and must provide an extremely smooth, seamless appearance bead. It mu
3、st also be compatible with production primer surfacer and topcoat systems and exhibit excellent painted appearance, durability and painted appearance equivalent to the performance of Class 1 exterior topcoat systems. 1.1.1 The material must be a smooth and homogeneous mixture free of air, lumps, unm
4、ixed particles, and foreign materials. 1.1.2 It must be capable of being dispensed with approved and validated production displacement pumping and robotic application equipment. 1.1.3 It must not have a noxious or toxic odor in either the uncured or cured state. 1.1.4 In addition, the material must
5、not adversely affect those personnel handling it. 1.1.5 The material must adhere to all approved production E-Coats. 1.1.6 It must not have corrosion-causing ingredients. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Sealing of exterior (horizontal) roof ditch joints after the E-Coat oven b
6、ut before primer surfacer application. 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D412 ASTM D2369 EPA Method 24 SAE J1864 ASTM D624 ASTM E1428 ISO 3219 SAE J1960 ASTM D1475
7、ASTM G21 ISO/TS 16949 ASTM D2196 EN ISO 1524 SAE J1524 2.2 GM Standards/Specifications. 9984548 GMW3022 GMW14124 GMW16124 9984549 GMW3025 GMW14829 GMW16701 GMW3016 GMW3059 GMW14873 GMW3019 GMW3205 GMW15481 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at
8、). Part numbers L 000 0794, L 000 0795. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15979 Copyright 2013 General Motors Company All R
9、ights Reserved June 2013 Page 2 of 11 3 Requirements Specific material requirements and appropriate test procedures are listed under the individual properties and summarized in Table 4. All bake schedules are specified in time at substrate temperature. 3.1 Requirements on Delivery. 3.1.1 Specific Gr
10、avity (ASTM D1475). 1.8 maximum. 3.1.2 Odor (GMW3205). The sealer must not emit a toxic or noxious odor. The material must not impose any adverse effects on personnel handling it. Also, after cure the material must not have a perceptible odor. In addition, the ED50 value of the sealer may be request
11、ed at the time of approval. Review “odor” and “fogging” GMW(s). 3.1.3 Volatile Organic Content (VOC) Determination (EPA Method 24, Using ASTM D2369). Ideal material performance would be 35.9 kg/m3 (0.3 lb/gal) VOC or less. However, the actual VOC of the product, including all weights, calculations,
12、and runs, are to be identified and reported as data in the submission book. 3.1.3.1 Condensing Volatiles Test (GMW3016). Four percent (4%) maximum allowed when baked as follows and tested according to GMW3016: 9984548/L 000 0794: 20 minutes at 165 C 5 C 9984549/L 000 0795: 20 minutes at 130 C 5 C 3.
13、1.4 Viscosity. The viscosity shall be determined and reported using the following three (3) methods: 3.1.4.1 Press Flow Viscosity (SAE J1524). Orifice: 1.32 mm Pressure: 414 kPa Sample weight: 20 g Sample test temperature: 25 C 0.5 C 3.1.4.1.1 The Press Flow Viscosity requirements are as follows: Ke
14、y Product Characteristic (KPC) requirement at 72 h from batch manufacture: The viscosity shall be 35 s to 45 s. In addition, when stored in proper conditions, the rate at which the viscosity increases with age should not exceed the following guidelines: Viscosity at 90 days shall be 72 h data + 35%.
15、 In no case should the material viscosity exceed 60 s at the end of the 90-day shelf life of the material. The initial and aging viscosity data shall be provided in both numerical and graphed format in the material submission book. 3.1.4.2 Brookfield Viscosity (ASTM D2196). Spindle size: 7 Rotationa
16、l speed: 20 rpm Sample test temperature: 25 C 0.5 C Rotation time to reading: 1 minute 3.1.4.2.1 The Brookfield Viscosity requirements are as follows: Key Product Characteristic requirement at 72 h from batch manufacture: The viscosity shall be 25 000 cps to 40 000 cps. In addition, when stored in p
17、roper conditions, the viscosity increase with age shall not exceed 50 000 cps by the end of the 90-day shelf life of the material. The initial and aging viscosity data shall be provided in both numerical and graphed format in the material submission book. Copyright General Motors Company Provided by
18、 IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15979 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 3 of 11 3.1.4.3 Determination of the Rheometric Viscos
19、ity Using a Rotational Viscometer (ISO 3219 and Z4 DIN Cup and Spindle). Refer to Table 1. Rotation speed: 0 to 130 at 1/s Sample test temperature: 25 C 0.5 C Table 1: Viscometer Program Test Time Start Speed End Speed Wait Period 300 s 0 1/s 0 1/s Ascending 120 s 0 1/s 130 1/s Hold Cycle 180 s 130
20、1/s 130 1/s Descending 120 s 130 1/s 0 1/s 3.1.4.3.1 The Relative Viscosity, yield point, and descending Bingham Viscosity (all KPC requirements) 72 h after batch manufacture shall be as follows: Yield point (at 72 h): 110 Pas to 125 Pas Bingham Viscosity (at 72 h): 6.5 Pas to 6.9 Pas Relative Visco
21、sity (at 72 h) 7.5 Pas to 8.0 Pas 3.1.4.3.2 In addition, when stored in proper conditions, the viscosity increase with age shall not exceed the following values: Yield point at 90 days shall not be greater than the 72 h data + 25% Bingham Viscosity at 90 days shall not exceed 8.0 Pas. Relative Visco
22、sity at 90 days shall not exceed the 72 h data + 25%. The measured and calculated data along with the curves generated shall all be included as data in the submission book. 3.1.5 Particle Size. EN ISO 1524: 200 m maximum. 3.2 Performance Requirements. 3.2.1 Adhesion (GMW3019). One (1) full set of te
23、st panels (bakes according to Table 2 and Table 3) must be prepared using a major production technology from each GM approved source of electrocoat. This must also include electrocoat technologies from all GM regions globally. The material must be capable of demonstrating a minimum of fine line cohe
24、sive adhesion performance after the first primer/sealer bake. Table 2: Bakes for Adhesion (Nominal Baked ELPO) Bake System 9984548/ L 000 0794 High Bake 9984549/ L 000 0795 Low Bake Minimum Prime/Seal 15 minutes at 158 C 15 minutes at 125 C Nominal Prime/Seal 20 minutes at 165 C 20 minutes at 130 C
25、Maximum Prime/Seal 60 minutes at 180 C 90 minutes at 158 C Maximum Powder Prime 60 minutes at 190 C Not applicable Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE
26、 ENGINEERING STANDARDS GMW15979 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 4 of 11 Table 3: Bakes for Adhesion (Over Baked ELPO) ELPO Bake Sealer/Primer Bake Maximum: 60 minutes at 190 C Minimum for Either High or Low Bake Primer 15 minutes at 158 C or 15 minutes at 125
27、 C The material, when baked as described in Table 2 and Table 3, must not crack or lose adhesion to the substrate during or after exposure to the following conditions. In addition, the material must demonstrate cohesive adhesion when peeled from the substrate. Initial adhesion: After cooling to ambi
28、ent temperatures Exterior cycle (GMW14124, Cycle F): 12 cycles 3.2.2 Elongation (ASTM D412, Method A) Using Die “C” Dumbbell and Crosshead Speed of 300 mm/minute. Material baked as described in 3.2.1 must exhibit the elongation requirements in Table 4: Table 4: Elongation Requirements 9984548/ L 000
29、 0794 9984549/ L 000 0795 Minimum Bake 100% 100% Nominal Bake 150% 150% Maximum Bake 150% 150% Maximum Powder Bake 100% Not applicable 3.2.2.1 Aged Elongation. A second set of panels shall be prepared according to 3.3 and then exposed to 70 C for 336 h. Following this exposure, the samples are allow
30、ed to stabilize to room temperature (25 C) and are then tested for elongation as described in 3.3. The samples must again meet the minimum elongation requirements in Table 4. 3.2.3 Tear Strength (ASTM D624, Method A) Using Die C and Crosshead Speed of 500 mm/minute. Two sets of samples shall be prep
31、ared and baked according to Table 2. 3.2.3.1 Initial Tear Strength. The first set of panels prepared in 3.2.2 shall be temperature stabilized to 25 C and then tested according to 3.3.2. The minimum tear strength requirement is 10 N/mm. 3.2.3.2 Aged Tear Strength. The second set of samples prepared i
32、n 3.3.2 shall be exposed to 70 C for 336 h. Following this exposure, the samples are temperature stabilized to 25 C and then tested according to 3.3.2. The minimum test strength requirement is again 10 N/mm. 3.2.4 Shrinkage/Expansion (GMW15481). Material baked according to Table 2 (maximum bakes onl
33、y) must exhibit no (0%) expansion and no shrinkage 2%. 3.2.5 Porosity. The material must exhibit no signs of trapped air from either an external observation or a cross-sectional view after being baked according to Table 2 (maximum bakes only). 3.2.6 Degradation Resistance. Apply two beads of sealer
34、3 mm thick x 40 mm wide x 200 mm long to the surface of a phosphated steel panel (inspect panel first to be sure it is free of surface corrosion). Bake panel as follows: For 9984548/L 000 0794, bake 1 h at 200 C For 9984549/L 000 0795, bake 1 h at 150 C After baking, remove panel from oven and allow
35、 it to cool to room temperature before proceeding. 3.2.6.1 After Bake. Remove one (1) sealer bead from the panel and inspect the surface of the panel. There must not be any corrosion on the surface of the panel where the sealer had been. Copyright General Motors Company Provided by IHS under license
36、 with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15979 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 5 of 11 3.2.6.2 After Humidity. Expose the panel with the remaining seal
37、er bead to 40 C and 98% humidity for 240 h. After humidity exposure, remove the remaining sealer from the panel and inspect the surface of the panel. Again, there must be no corrosion on the panel surface where the sealer had been. 3.2.7 Compatibility with Associated Production Materials/Processes.
38、Compatibility with plant-specific materials such as primer surfacers, topcoats and windshield urethane shall be evaluated prior to introduction to any production facilities. If there are any plant-specific material issues that must be addressed, the details are to be discussed and resolved between t
39、he responsible engineer and the supplier prior to the initiation of testing. 3.2.8 Topcoat Compatibility (GMW14829). Test panels shall be prepared according to layering combinations 3.2.8.1 and 3.2.8.2 and baked according to the appropriate bake schedule in Table 5 (high or low primer bake). The pai
40、nt systems tested shall represent at least one production system from each major paint supplier. The systems chosen should cover the different types of primer, basecoat and clearcoat technologies and must also represent paint systems/technologies from each region of GM globally. Layering Combination
41、s: 3.2.8.1 Topcoat Only (No Primer Surfacer). Topcoat is applied wet on dry (WOD) over cured sealer. Topcoat is to be applied at target film build for hiding/technology. 3.2.8.2 Full Paint System. Primer surfacer is applied wet on wet (WOW) over sealer, then baked, followed by topcoat application ov
42、er baked primer/sealer and again baked. Both primer and topcoats are to be applied at target film builds for technology. Table 5: Bakes for Paint Testing Bake System High Bake System 9984548/L 000 0794 Low Bake System 9984549/L 000 0795 Minimum Prime/Seal + Nominal Topcoat 15 minutes at 158 C + 20 m
43、inutes at 130 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) 15 minutes at 125 C + 20 minutes at 130 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) Nominal Prime/Seal + Nominal Topcoat 20 minutes at 165 C + 20 minutes at 165 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) 20 minutes at 13
44、0 C + 20 minutes at 130 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) Maximum Prime/Seal + Nominal Topcoat 90 minutes at 158 C + 20 minutes at 130 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) 90 minutes at 158 C + 20 minutes at 130 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) Maximu
45、m Powder + Nominal Topcoat 60 minutes at 190 C + 20 minutes at 130 C (WB or SB + 1K) or 20 minutes at 121 C (WB + 2K) Not applicable Nominal Prime/Seal + Maximum Topcoat 20 minutes at 165 C + 90 minutes at 140 C 20 minutes at 130 C + 90 minutes at 140 C Key: 1K = One Component 2K = Two component SB
46、= Solventborne WB = Waterborne 3.2.8.3 Primer Technologies. Solventborne (SB) primers (includes color keyed and color specific) Waterborne primers (WB) (includes color keyed and color specific) Powder primer (includes color keyed and color specific) Copyright General Motors Company Provided by IHS u
47、nder license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15979 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 6 of 11 3.2.8.4 Basecoat (Color Coat) Technologies. Waterbor
48、ne Solventborne Powder 3.2.8.5 Clearcoat Technologies. Solventborne 1K Solventborne 2K Waterborne Powder 3.2.8.6 Colors to be Tested. White Black Red or red metallic A light metallic (other than red) If any of the colors called out are not available in a designated plants color palette, another representative color is to be substituted. In addition, more colors may be added to the testing requirement at the discretion of the approving engineer. 3.2.8.7 Environments. The following tests should be performed on panels prepared according to 3.2.8.2 and 3.
