ASTM D3521 Standard Test Method for Surface Wax Coating On Corrugated Board
6. Apparatus
6.1 Sample-Trimming Equipment - A suitable trimming board or template arrangement equipped with a razor edge knife for even cutting of specimens to required size, with parallel sides. (A guillotine-type paper cutter is not recommended.)
6.2 Measuring Rule, steel edged, for measuring the size of specimen to within 0.5 mm.
6.3 Razor Blades, common single-edge, having a rigid rim for holding in the fingers. The blade is used for surface wax scraping and an adequate supply of fresh blades with sharp edges is required.
6.4 Analytical Balance, reading to nearest 1 mg.
7. Sampling and Test Specimen
7.1 From each test unit, obtained in accordance with Practice D585, that is, each finished carton blank or paperboard sheet, cut specimens free from obvious defects. Each specimen should measure 100 by 100 mm, cut to the nearest 0.5 mm. Record the area of the surface to be tested, and whether it is an inside or outside facing. Duplicate specimens are required from each sample unit.
NOTE 2 - The operator may be required to increase the replication and treatment of specimens to obtain a better estimate of "average" wax loading, (1) if the waxing is at an extremely low level, or (2) if the wax loading shows obvious wide variations in distribution over the board area.
NOTE 3 - Optionally, specimens of other dimensions may be used if required by sampling limitations. In such cases, calculations need to be appropriately adjusted.
7.2 Condition all boards at 23°C (73°F) and 50 % relative humidity for a minimum of 48 h before beginning test procedure.
