ASTM D3521 Standard Test Method for Surface Wax Coating On Corrugated Board
10. Report
10.1 Identify which facing of the corrugated board was tested and report - Surface Coating on Facing in grams per square metre. If desired, the surface coating weight may be reported in pounds per thousand square feet by multiplying d by 0.205.
11. Precision and Bias
11.1 The precision of this test method as obtained by statistical examination of interlaboratory test results is as follows:
11.1.1 Repeatability - The difference between successive test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material, would in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
15 % of the mean
11.1.2 Reproducibility - The difference between two single and independent results, obtained by different operators working in different laboratories on identical test material, would in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
24 % of the mean
11.2 Precision has been determined by interlaboratory testing of corrugated board samples of two types: (1) having the coating applied to plain untreated board, and (2) having the coating applied to board previously partially impregnated (saturated) with wax.
11.3 Due to the high degree of normal variability from specimen to specimen, close precision may be difficult to obtain. In cases where close precision is needed or precision is suspect, multiple sampling and testing should be done.
11.4 Bias - The procedure for measuring surface wax on corrugated board has no bias because the value for the surface wax can be defined only in terms of a test method.
12. Keywords
12.1 coating; corrugated; wax
