1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW16700 Wash-off Resistance Test for Adhesives and Sealers Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: North American Engineering Standards Page 1 of 6 1 Scope Note: Nothing in this standard superced
2、es applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test procedure is used to determine the wash-off resistance of adhesives, sealers and other materials that are processed through
3、 assembly plant cleaning, pre-treatment and electrocoat (ELPO) systems. 1.2 Foreword. Not applicable. 1.3 Applicability. This test procedure is intended for use with adhesives, sealers and other materials that are applied at the metal center or body shop, and are subsequently processed through clean
4、ing, pre-treatment and ELPO systems at the assembly plant. This procedure may be used for materials that are pumpable or pre-formed. Test materials are evaluated in the uncured or gelled condition, as applicable for the specific test material. Method A is an assembly plant test. Method B is a labora
5、tory test with direct spray impingement. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW8 GMW15477 GMW14019 3 Resources 3.1 Facilities. 3.1.1 Method A: Plant Test. Facili
6、ties required for Method A only. 3.1.1.1 Induction Gelling System. Production. 3.1.1.2 Degreasing, Pre-treating and Electrocoating Baths. Production. 3.1.2 Method B: Lab Test with Direct Spray Impingement. No facilities required for Method B only. 3.2 Equipment. 3.2.1 Methods A and B. Equipment requ
7、ired for all methods. 3.2.1.1 Cartridge Gun. For pumpable materials. 3.2.1.2 Cartridge Nozzle. For pumpable materials with respective opening diameter. 3.2.1.3 Oven. For heating warm-applied pumpable materials prior to manual application. 3.2.1.4 Roller. For controlled wet-out of pre-formed material
8、s, especially constrained layer damper pads. Roller weight 2000 20 g, unless otherwise specified. 3.2.2 Method A: Plant Test. Additional equipment required for Method A only. 3.2.2.1 Body-in-White (BIW). 3.2.2.2 Panel Holder. Fixture for attaching test pieces to the BIW. Copyright General Motors Com
9、pany Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16700 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 6 3.2.3 Method B: Lab Test wi
10、th Direct Spray Impingement. Additional equipment required for Method B only. 3.2.3.1 Induction Gelling System. Production-representative. 3.2.3.2 Spray Nozzle. Sixty-five degree (65) V-fan nozzle with 20 L per minute at 3 bar. 3.2.3.3 Rubber Hose. With inner diameter (ID) approximately 10 mm. 3.2.3
11、.4 Tap Water Source. Capable of maintaining a temperature of 58 C. 3.2.3.5 Water Pressure Gauge. Units in bar. 3.2.3.6 Large Clips. Capable of holding test panels in place. 3.3 Test Vehicle/Test Piece. 3.3.1 Metal Panels. Substrates, lubricants and panel configuration shall be according to the relev
12、ant material specification or the responsible material engineer. If no substrates, lubricants or panel configurations are specified, use unconstrained (open-faced), hot-dipped galvanized (HDG) steel panels per GMW8 with minimum dimensions 100 mm x 250 mm. Oil panels according to GMW15477 with a chal
13、lenging GMW14019 lubricant. 3.3.2 Test Material. For Method A, apply the test material according to GMW15477, the relevant material specification, or the responsible material engineer. For Method B, apply the test material across the width of the panel, centered approximately 125 mm from either end
14、of the panel. 3.3.2.1 Pumpable Test Material. For Method A, bead dimensions according to GMW15477, the relevant material specification, or the responsible material engineer. For Method B, bead with dimensions: 13 mm wide x 7 mm high, unless otherwise specified. 3.3.2.2 Pre-formed Test Material. For
15、Method A, test material with dimensions according to GMW15477, the relevant material specification, or the responsible material engineer. For Method B, sample with dimensions: 20 mm wide x 100 mm long x 2 mm thick, unless otherwise specified. 3.3.3 Gelling. Testing shall be completed with uncured ma
16、terial. Test material shall be gelled when gelling is specified by the relevant material specification, the suppliers technical data sheet, or by the responsible material engineer. 3.3.3.1 Inductive Gelling. If inductive gelling is specified, the test material shall be applied directly to the test p
17、anel and inductively gelled. The production induction system is recommended to be used whenever possible. The temperature and temperature distribution of the induction system shall be verified to be operating within specifications prior to test piece preparation. 3.3.3.2 Two-Component Materials. Two
18、-component (2K) test materials shall be evaluated after handling stiffness has been achieved due to the 2K reaction. The period to reach handling stiffness shall be according to the relevant material specification, the suppliers technical data sheet or the responsible material engineer. 3.3.4 Aging.
19、 Test material shall be aged for a minimum of 2 h after application or after gelling, prior to testing. 3.3.5 Number of Test Pieces. Testing shall be completed with a minimum of one test piece per condition, unless otherwise specified. 3.4 Test Time. Method A Method B Calendar time: 1 day 1 day Test
20、 hours: 4 hours 2 hours Coordination hours: 2 hours 2 hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Trained lab technician or test engineer. 4 Procedure 4.1 Preparation. Not applicable. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. Copyright General Mot
21、ors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16700 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 3 of 6 4.2.2 Test Condition
22、s. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Method A: Plant Test. 4.3.1.1 Attach the test piece(s) to the panel holder, and attach the panel hold
23、er to the body-in-white. The panel holder shall be positioned at the door inner panel with the test material facing the passenger compartment as shown in Figure 1. Figure 1: Method A - Positioning of Test Piece and Panel Holder on Body-In-White 4.3.1.2 Process the test piece through the cleaning, pr
24、e-treatment and ELPO systems on the body-in-white. 4.3.1.3 Remove the test pieces from the body-in-white prior to the ELPO oven. 4.3.1.4 Evaluate the test material for any signs of movement, distortion or displacement. 4.3.2 Method B: Lab Test with Direct Spray Impingement. 4.3.2.1 Adjust the water
25、temperature to 58 C and the water pressure to 0.7 bar (gauge reading). 4.3.2.2 Position the test panel at a 45 degree angle in the sink. This can be accomplished by bending another panel into a 45 degree angle and clipping the test panel to it. Place the nozzle at a distance of 150 mm perpendicular
26、to the test panel. See Figure 2. Figure 2: Lab Test Assembly T E S T M A T E R I AL250 125 1 0 0 x 2 5 0 P AN E L ( M i n. di m e ns i ons )Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license
27、from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16700 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 4 of 6 4.3.2.3 With the nozzle positioned perpendicular to the test material and the water pressure and temperature adjusted as described, pass the stream of water ba
28、ck and forth across the full length of the test material at a rate of 1 s per pass. A pass is defined as one movement from left to right or one movement from right to left. Continue running this test for 3 minutes. 4.3.2.4 Rate the test material for any signs of movement, distortion or displacement
29、using the Wash-Off Rating Scale in Table 1 for Pumpable Test Materials or in Table 2 for Pre-formed Test Materials. Table 1: Wash-Off Rating Scale for Method B: Pumpable Test Materials Rating Bead Width Note 1 (mm) Description Graphic 5 13 No movement of material No distortion on bead No material se
30、parated from bead 4 13 to 16 Little or no movement of material Little or no pock-markings on bead No material separated from bead 3 16 to 19 Small movement of material Pock-markings on bead Slight amount of material separated from bead 2 19 to 22 Definite movement of material Definite pock-markings
31、on bead Small amount of material separated from bead 1 22 Large movement of material Many large pock-markings on bead Significant amount of material separated from bead Note 1: Initial bead width 13 mm. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for
32、 ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16700 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 5 of 6 Table 2: Wash-Off Rating Scale for Method B: Pre-formed Test Materials Rating Description Graphi
33、c 5 No movement of material from initial footprint No disturbance to surface of material No loss of contact between material and panel 4 No movement of material from initial footprint Slight disturbance to surface of material No loss of contact between material and panel 3 Small ( 5%) movement of ma
34、terial from initial footprint Small ( 5%) loss of contact between material and panel 2 Significant ( 5% to 99%) movement of material from initial footprint Significant ( 5% to 99%) loss of contact between material and panel 1 Complete (100%) loss of contact between material and panel 5 Data 5.1 Calc
35、ulations. None. 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. Report any test deviations. For each test piece: All Methods - Photograph performance. Method A - Report any signs of wash-off. Method B - Report the rating. 6 Safety This standard may involve hazardous materials,
36、 operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7
37、Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. 2K Two-component BIW Body-in-White ELPO Electrodeposition Process or Electrocoat HDG Hot-dipped Galvanized (steel) ID Inner Diameter Copyright General Motors Company Provided by IHS under license with General Motors Compan
38、yNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16700 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 6 of 6 8 Coding System This standard shall be referenced in other documents, drawings, etc., as
39、 follows: Test to GMW16700, Method X Where: X describes the Test Method 9 Release and Revisions This standard was originated in September 2011. It was first approved by Global Paint & Polymers Center and the Global Adhesives Committee in November 2011. It was first published in November 2011. Issue Publication Date Description (Organization) 1 NOV 2011 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
