Chip Resistance ASTM D3170

Chip Resistance of Coatings (Gravelometer) ASTM D3170, SAE J400

Scope:
The Gravelometer is designed to evaluate the resistance of surface coatings (paint, clear coats, metallic plating, etc.) to chipping caused by the impacts of gravel or other flying objects. The primary usage of this test is to simulate the effects of the impact of gravel or other debris on automotive parts.

Test Procedure:
The test sample is mounted in the back of the Gravelometer, and air pressure is used to project 1 pint (approximately 300 pieces) of gravel at the sample. The test sample is then removed an gently wiped off with a clean cloth. Tape is then applied to the entire tested surface. Removal of the tape then pulls off any loose fragments of the coating. The appearance of the tested sample is then compared to standard transparencies supplied by SAE to determine the chipping ratings. Visual examination can also be used to describe where in the coating/substrate system that the failure has been induced.

Specimen size:
A coated 4 inch by 12 inch panel

Data:
Chipping Ratings consist of one or more letter-number combinations. The letter designates the chip sizes being counted, and the number designates the number of chips of that size. For example B6 indicates 10-24 chips 1 to 3 mm in size. Point of Failure describes the coating layer where the primary failures are occurring - for example P/T indicates that the point of failure is between the primer and the top coat.

**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact an Intertek PTL Technical Representative at iptl@intertek.com. Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.
 
Need help or have a question? +1 413 499 0983
 

Need help or have a question?

+1 413 499 0983
Wilton UK:
+44 1642 435 788
Benelux:
+31 88 126 8888
France:
+33 (0) 385 99 12 80
APAC:
+65 6805 4800
Germany:
0800 5855888
+49 711 27311 152
Switzerland:
+41 61 686 4800
Mexico:
01 800 5468 3783
+52 55 5091 2150
Brazil:
+55 11 2322 8033
Australia:
+61 1300 046 837
India:
+91 (22) 4245 0204