ISO 20567-2:2005 specifies a method for the evaluation of the resistance of automobile finishes and other coatings to the impact of a wedge-shaped body projected onto the surface under test to simulate the impact of stones.
BS ISO 20567-2:2005 history
2005BS ISO 20567-2:2005 Paints and varnishes - Determination of stone-chip resistance of coatings - Single-impact test with a guided impact body