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Title: Improving Precision Through Test Optimization
Author: Aaron Wiest, Craig Macdougall, Stephen Vanwaus, Patrick Dietz, Jeremiah Doolittle, Jamie Lizarraga, Ryan Marcroft, David Ball
Source: 2011 Measurement Science Conference
Year Published: 2011
Abstract: Certain tests are assumed to be inherently qualitative. ASTM D3170 Standard Test Method for Chipping Resistance of Coatings is a prime example. The test involves bombarding a test plate with a given volume and size of gravel fired horizontally from a pipe under a fixed air pressure with an apparatus called a gravelometer. The diameter of the impacts and number of impacts is used to assign a letter and number score. A factor of 2 4 difference in results is acceptable for successive tests within the same laboratory and a factor of 3 12 difference in results is acceptable for interlaboratory results. By using gravity instead of air pressure as the accelerant and coupling the test with a quantitative optical measurement technique called verification (MIL STD 130N), greater reproducibility was achieved. The adapted ASTM D3170 was used to test labels with IUID compliant data matrices for chipping resistance

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