ASTM D2423 Standard Test Method for Surface Wax on Waxed Paper or Paperboard
8. Procedure
8.1 Prepare a specimen consisting of a 100 mm by 100 mm square of waxed paper. Determine the area (in square millimetres) of each specimen to the nearest 1.0 % of its total area.
8.2 Weigh the specimen on the analytical balance to the nearest 0.5 % of its total weight.
8.3 Remove the surface wax from one side of the specimen (side No. 1) by scraping toward each of its four edges as follows: Hold the specimen firmly on the pad to prevent slippage. With a razor blade held vertically, scrape the entire area of one side of the specimen with repeated one-directional strokes of the blade, slightly overlapping the strokes. Rotate the specimen through 90° and repeat the scraping. Continue rotating and scraping twice more to complete the process.
8.4 Reweigh the specimen as described in 8.2. Record the weight of the specimen as the scraped basis weight side No. 1.
8.5 Remove the surface wax from side No. 2 of the specimen by scraping as described in 8.3.
8.6 Reweigh the specimen and record the weight as the scraped basis weight side No. 2.
9. Calculation
9.1 The surface wax weight is determined by weight difference. The weight of surface wax on side No. 1 of the sample is the difference between the initial weight and the scraped weight side No. 1. The weight of the surface wax on side No. 2 of the sample is the difference between the scraped weight side No. 2 and the scraped weight side No. 1. Multiply the weight in grams per square millimetre by 10(6) to convert to grams per square metre.
