The wear test using the sand trickling process is used to evaluate the resistance of surfaces (e. g. glass or plastic), mainly for transparent panes, against perpendicular/diagonal blast wear and hazing (scratching). This process can be used to evaluate surfaces for desert operation. The test can be performed on both flat and curved surfaces. Surface wear or hazing of the pane is noted. The increase in scattered light or a roughness measurement are used as the indicator.