ASTM D2423 Standard Test Method for Surface Wax on Waxed Paper or Paperboard
10. Report
10.1 Report the surface wax weight in grams per square metre. To convert from grams per square metre to pounds per ream, see Test Method D646. To obtain results in terms of pounds per 1000 ft2, multiply the grams per square metre by 0.205.
11. Precision and Bias
NOTE 1 - The precision data were obtained on five replicate specimens (in each laboratory) on samples of commercially waxed paper with a weight range of between 3.25 g/m2 and 9.76 g/m2 (2 lb/3000 ft2 and 6 lb/3000 ft2) of wax on each surface.
11.1 Precision - The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
11.1.1 Repeatability - The difference between two 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:
0.976 g/m2 (0.6 lb/ream)
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:
1.46 g/m2 (0.9 lb/ream)
11.2 Bias - The procedure in this test method has no bias because the surface wax on waxed paper or paperboard can be defined only in terms of a test method.
12. Keywords
12.1 paper; paperboard; wax
