ASTM D7095 Standard Test Method for Rapid Determination of Corrosiveness to Copper from Petroleum Products Using a Disposable Copper Foil Strip
12. Report
12.1 Report the corrosiveness of the sample in accordance with one of the classifications listed in Table 1, as derived after comparison with the Copper Strip Corrosion Standards. State the test method (TM) designation, the test procedure followed (pressure vessel procedure (PVP) or test tube procedure (TTP)), duration of the test, and the test temperature in the following format:
Corrosion, copper foil strip, Classification Zp by TM, PVP or TTP, Xm at Y°C
where:
Xm = test duration, min,
Y = test temperature, °C,
Z = classification category (that is, 1, 2, 3, or 4), and
p = classification description for the corresponding Z (for example, a, b, c, d or e).
13. Precision and Bias
13.1 In the case of pass/fail data, no generally accepted method for determining precision or bias is currently available.
13.2 Relative Bias - During the development of this test method, a comparison study was performed between this method and Test Method D130. The comparison study involved six laboratories that analyzed a variety of sample types available in their laboratory. Atotal of46 samples, covering the copper corrosion standard rating range from 1a to 3b (see Table 1), were evaluated. Sample types evaluated in the study include naphtha, gasoline, low and high sulfur diesel, JP-5, aviation turbine fuel, No. 2 fuel oil, gas oil, and hexane (solvent). Copper corrosion standard ratings determined by both methods matched exactly in all cases, with the exception of one sample, where the Test Method D130 analysis resulted in a rating of 1b as compared to 1a by this test method.
14. Keywords
14.1 automotive gasoline; aviation gasoline; aviation turbine fuel; copper corrosion; copper foil strip; corrosiveness to copper; natural gasoline
