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ASTM - D7187

Standard Test Method for Measuring Mechanistic Aspects of Scratch/Mar Behavior of Paint Coatings by Nanoscratching

inactive
Organization: ASTM
Publication Date: 1 July 2005
Status: inactive
Page Count: 11
ICS Code (Paints and varnishes): 87.040
scope:

This test method covers the nanoscratch method for determining the resistance of paint coatings on smooth flat surfaces to scratch/mar.

Previous methods used in scratch/mar evaluation first physically scratch or mar a sample's surface with multiple contact cutting, and then use visual inspection to assign a ranking. It has been recognized that loss of appearance is mainly due to surface damages created. The philosophy of this method is to quantitatively and objectively measure scratch/mar behavior by making the evaluation process two steps with emphasis on surface damages. Step one is to find the relation-ship between damage shape and size and external input (such as forces, contact geometry, and deformation). Step two is to relate damage shape and size to visual loss of luster. The first step is covered by this method; in addition, a survey in the appendix provides an example of an experiment to relate the damage to the change in luster.

There are three elementary deformation mechanisms: elastic deformation, plastic deformation and fracture; only the latter two both contribute significantly to mar. This method evaluates scratch/mar based on the latter two damage mechanisms.

The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

This standard does not purport to address all of the safety problems, if any, 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.

 

Document History

June 1, 2020
Standard Test Method for Measuring Mechanistic Aspects of Scratch/Mar Behavior of Paint Coatings by Nanoscratching
This test method covers a nanoscratch method for determining the resistance of paint coatings on smooth flat surfaces to scratch/mar. Other methods used in scratch/mar evaluation physically scratch...
February 1, 2015
Standard Test Method for Measuring Mechanistic Aspects of Scratch/Mar Behavior of Paint Coatings by Nanoscratching
This test method covers the nanoscratch method for determining the resistance of paint coatings on smooth flat surfaces to scratch/mar.  Previous methods used in scratch/mar evaluation first...
December 1, 2010
Standard Test Method for Measuring Mechanistic Aspects of Scratch/Mar Behavior of Paint Coatings by Nanoscratching
This test method covers the nanoscratch method for determining the resistance of paint coatings on smooth flat surfaces to scratch/mar. Previous methods used in scratch/mar evaluation first...
D7187
July 1, 2005
Standard Test Method for Measuring Mechanistic Aspects of Scratch/Mar Behavior of Paint Coatings by Nanoscratching
This test method covers the nanoscratch method for determining the resistance of paint coatings on smooth flat surfaces to scratch/mar. Previous methods used in scratch/mar evaluation first...

References

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