1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14698 Scratch Resistance of Organic Coatings and Self-adhesive Foils Copyright 2012 General Motors Company All Rights Reserved August 2012 Originating Department: North American Engineering Standards Page 1 of 6 1 Scope Note: Nothing in this standar
2、d supercedes 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 standard shall be used to determine the scratch resistance of organic coatings applicable to single or multiple coat s
3、ystems applied onto metallic or polymeric substrates and self-adhesive foils. Changes of the organic coat or self-adhesive foil, e.g., deformation or change of brightness (visual impression), are not covered with this standard. 1.2 Foreword. Not applicable. 1.3 Applicability. Single or multiple coat
4、 systems applied onto metallic or polymeric substrates and self-adhesive foils. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 105-A02 ISO 6507-1 2.2 GM Standards/Specifications. GMW14898 2.3 Additional Refe
5、rences. None. 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 Apparatus as required by the appropriate test procedures, for example: 3.2.2 Hardness Test Rod (Method A). See Figure 1. A: Adjustment mark for spring force B: Spring Figure 1: Hardness Test Rod Provided by IHSNot for Res
6、aleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14698 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 2 of 6 The rod may be procured from the following sources: Type 318 from Erichsen.de Erichsen GmbH noticeable
7、 whitening when viewed at a 45 degree angle for either end of the scratch line 3 Noticeable whitening when viewed at 90 degree angle 2 to 3 Noticeable to Severe whitening when viewed at any angle 2 Severe whitening when viewed at any angle 1 to 2 Severe to Complete whitening when viewed at any angle
8、 1 Complete whitening when viewed at any angle 5.2 Interpretation of Results. The force at which the tip of the test rod on a single coat system just fails to penetrate to substrate material, or on a multi-coat system just fails to penetrate the top coat or a self-adhesive foil just fails to penetra
9、te the foil shall be recorded. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14698 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 6 of 6 5.3 Test Documentation. The results of this t
10、est shall be reported in a test report with reference to this test procedure. Report the tip (GMW14898-1 or GMW14898-2), test equipment (Method A, B or Method C), and force for each scratch on the surface of the sample. If more than one sample is tested, results may be averaged. 6 Safety This standa
11、rd 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 responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regu
12、latory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable 7.2 Acronyms, Abbreviations, and Symbols. AATCC American Association of Textile Chemists and Colorists 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14698 - 1 to 13 N
13、minimum Test to GMW14698 - 2 to 4 N minimum 9 Release and Revisions This standard was originated in October 2005. It was first approved by Global GM Materials Group in December 2006. It was first published in September 2007. Issue Publication Date Description (Organization) 1 SEP 2007 Initial public
14、ation. 2 AUG 2012 Five year refresh of standard. Added alternative test devices for Method A and referenced suppliers, added Method C and added evaluation table for mold-in-color plastics. (Finishes & Coatings Global Subsystem Leadership Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
