ASTM D3170 – Standard Test Method for Chipping Resistance of Coatings
Description:
Significance and Use
4.1 Owners consider chipping of coatings, particularly on the leading faces and edges of automobile surfaces, unacceptable. In formulating a coating or coating system to meet service requirements, the resistance to chipping damage by flying objects such as gravel is one of the properties of importance since it can vary considerably as other properties are adjusted. Since resistance to chipping decreases at lower temperatures partly as the result of decreased flexibility, the test may be more directly related to service conditions by performing it at a low temperature. This test method is designed to produce a controlled amount of impact by the media on the coated panel in order to enhance reproducibility.
Scope
1.1 This test method covers the determination of the resistance of coatings to chipping damage by stones or other flying objects.
Note 1: This test method is similar to SAE J-400.
1.2 All dimensions are nominal unless otherwise specified.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
ASTM D3168