1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15481 Evaluation of Volume Expansion of Adhesives and Sealing Materials Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 1 of 3 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the
2、 event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test procedure is used to estimate the volume expansion of adhesives and sealing materials after being baked. It can be used to evaluate either pumpable or preformed materials.
3、 1.2 Foreword. Not applicable. 1.3 Applicability. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. Not applicable. 3.1.1 Calib
4、ration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this standard shall be determined correctly with respect
5、 to their physical definition. 3.2 Equipment. 3.2.1 Circulation Oven. Capable of maintaining a set temperature within 3 C. 3.2.2 Cartridge Gun. Not required for preformed materials. 3.2.3 Balance. With an accuracy of 0.001 g. 3.3 Test Vehicle/Test Piece. 3.3.1 Number of Test Samples. For initial app
6、roval, the expansion factor shall be determined with a minimum of three (3) test samples. 3.3.2 Sheet Metal. Approximate size: 4 cm to 6 cm length and width, or diameter, 1 mm thickness. Not required for preformed materials. 3.3.3 Adhesive/Sealer. To be tested. 3.3.4 Distilled Water. 3.4 Test Time.
7、Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. 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 ENGINEERING S
8、TANDARDS GMW15481 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 2 of 3 4 Procedure This Test Procedure determines the volume expansion of adhesives and sealing materials through the difference of the volume of the cured and the uncured adhesive/sealer sample. 4.1 Prepara
9、tion. 4.1.1 Curing Schedule. 4.1.1.1 Body Shop Applied Adhesive and Sealer Materials. Separate sets of samples shall be cured. One (1) according to the minimum Bake Schedule and one (1) according to the maximum Bake Schedule stated in the associated Material Specification. 4.1.1.2 Paint Shop. Separa
10、te sets of samples shall be cured. One (1) according to the minimum Bake Schedule and one (1) according to the maximum Bake Schedule stated in the associated Material Specification. 4.1.1.3 Deviations. Samples shall be cured according to the time and temperature parameters identified by the Material
11、 Engineer specifying the deviation. 4.2 Conditions. 4.2.1 Environmental Conditions. All measurements shall be performed at +23 C 5 C. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test
12、 certificates, reports, etc. 4.3 Instructions. Report the method used. 4.3.1 Method 1. This method requires a sheet metal backing plate. It is typically used to evaluate pumpable adhesives, pumpable sealers, or other non-self supporting materials. 4.3.1.1 Volume of Sheet Metal. The sheet metal shall
13、 be first weighed in air (W1) and then in water (W2). From the difference of these weights, results the volume of sheet metal. 4.3.1.2 Volume of Uncured Test Sample. The adhesive/sealer to be tested shall be applied to the sheet metal in the form of a bead with a diameter of 6.0 mm 2.0 mm, and a len
14、gth of 50.0 mm 5.0 mm. This test sample shall be first weighed in air (W3) and then in water (W4). From the difference of weights results the volume of the sheet metal and of adhesive/sealer shall be tested. 4.3.1.3 Volume of Cured Test Sample. The test sample from 4.3.1.2 shall be baked in an oven
15、according to curing schedule, (4.1.1). After cooling to + 23 C 5 C, the test sample shall be weighed first in air (W5) then in water (W6). From the difference of weights results the volume of the sheet metal and of adhesive/sealer to be tested. 4.3.2 Method 2. This method does not require a sheet me
16、tal backing plate. It is typically used to evaluate preformed adhesives, preformed sealers, or other self-supporting materials. 4.3.2.1 Sample Size. Approximately 20 mm length 20 mm width 3 mm to 4 mm thickness, or as limited by the properties of the material. 4.3.2.2 Volume of Uncured Test Sample.
17、The test sample shall first be weighed in air (W3) and then in water (W4). From the difference of weights results the volume of the adhesive/sealer to be tested. 4.3.2.3 Volume of Cured Test Sample. The test sample from 4.3.2.1 shall be baked in an oven according to curing schedule (4.1.1). Bake the
18、 sample on a non-stick surface. After cooling to +23 C 5 C, the test sample shall be weighed first in air (W5) then in water (W6), from the difference of weights results, the volume of the adhesive/sealer to be tested. 5 Data 5.1 Calculations. The percentage volume expansion shall be calculated acco
19、rding to the following formula: 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 GMW15481 Copyright 2013 General Motors Company All Rights Re
20、served August 2013 Page 3 of 3 5.1.1 Method 1. 100 x %i n Fa c t o r E x p a n s i o n ) W- (W - ) W- (W ) W- (W - ) W- (W 2143 4365 W1 = Weight of sheet metal in air W2 = Weight of sheet metal in water W3 = Weight of sheet metal and adhesive/sealer uncured in air W4 = Weight of sheet metal and adhe
21、sive/sealer uncured in water W5 = Weight of sheet metal and adhesive/sealer after curing in air W6 = Weight of sheet metal and adhesive/sealer after curing in water 5.1.2 Method 2. 100x % in F a c t o r E x p a n s i o n )W-(W )W-(W-)W-(W 43 4365 W3 = Weight of sheet metal and adhesive/sealer uncure
22、d in air W4 = Weight of sheet metal and adhesive/sealer uncured in water W5 = Weight of sheet metal and adhesive/sealer after curing in air W6 = Weight of sheet metal and adhesive/sealer after curing in water 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. The average expansio
23、n factor shall be reported with reference to the applied curing schedule (4.1.1) and the method (4.3) used. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsi
24、bility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be refe
25、renced in other documents, drawings, etc., as follows: Test to GMW15481 9 Release and Revisions This standard was originated in November 2006. It was first approved by Materials and Appearance and Global Paint and Polymer Center Team in May 2008. It was first published in July 2008. Issue Publicatio
26、n Date Description (Organization) 1 JUL 2008 Initial publication. 2 AUG 2013 Refresh. (Adhesives Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
