ASTM C373-18 pdf download.Standard Test Methods for Determination of Water Absorption and Associated Properties by Vacuum Method for Pressed Ceramic Tiles and Glass Tiles and Boil Method for Extruded Ceramic Tiles and Non-tile Fired Ceramic Whiteware Products.
5. Test Specimens:
5.1 Non-tile Fired Ceramic Whitewares:
5.1.1 At least five representative test specimens shall be selected that have not been previously tested. The specimens shall be unglazed and shall have as much of the surface freshly fractured as is practical. Sharp edges or corners shall be removed. The specimens shall contain no cracks. The indi- vidual test specimens shall weigh at least 50 g (0.11 lb).
5.2 Ceramic Tiles and Glass Tiles:
5.2.1 Sampling shall be carried out in accordance with Table 1 and 5.2.2 through 5.2.8 based on the length (x), width (y), and the area ofthe tiles to be tested (for irregularly shaped tiles, see Note 1). Tiles and relevant specimens must contain no visible damage or cracks prior to testing and have not been previously tested. Any loose or contaminating material shall be removed. This includes any mesh, paper and adhesive that has been applied to mosaics. Cutting of specimens, as described in the following sections, shall consist ofscoring and snapping, or sawing when impossible to score and snap with conventional tile scoring equipment (as can be the case with some glass tiles and textured and structured porcelain tiles). N OTE 1—For irregularly shaped tiles (hexagons, circles, and so forth), consider the area of the minimum rectangle in which the tile can be fit.
5.2.2 For tiles less than or equal to 420 cm 2 (65 in. 2 ), at least five representative test specimens shall be selected. Specimens shall be cut in half, within 10 mm (0.4 in.). Specimens shall be cut perpendicular to the longest side if the specimen has unequal sides. Select one half at random from each specimen for testing (see Fig. 1a and Fig. 1b). 5.2.3 For tiles greater than 420 cm 2 (65 in. 2 ) and less than or equal to 3600 cm 2 (558 in. 2 ), with x and y > 205 mm (8 in.), at least five representative test specimens shall be selected. A 205 × 205 mm (8 × 8 in.) portion, within 10 mm (0.4 in.), shall be cut from one corner of each specimen for testing (see Fig. 2).
5.2.4 For tiles greater than 420 cm 2 (65 in. 2 ), with 205 mm (8 in.) < x < 1000 mm (39 in.) and y ≤ 205 mm (8 in.), at least five representative test specimens shall be selected. Each specimen shall be cut once perpendicular to the longest side, such that a 205 mm (8 in.) portion, within 10 mm (0.4 in.), is available for testing (see Fig. 3).
5.2.5 For tiles greater than 420 cm 2 (65 in. 2 ), with x ≥ 1000 mm (39 in.) and y ≤ 205 mm (8 in.), at least five representative test specimens shall be selected. Each specimen shall be cut twice, once on each end, perpendicular to the longest side, such that two 205 mm (8 in.) portions within 10 mm (0.4 in.), one from each end, are available for testing (see Fig. 4). 5.2.6 For tiles greater than 3600 cm 2 (558 in. 2 ), with x and y ≥ 410 mm (16 in.), at least three representative test speci- mens shall be selected. A 205 × 205 mm (8 × 8 in.) portion, within 10 mm (0.4 in.), shall be cut from each of the four corners of each specimen for testing (see Fig. 5). 5.2.7 For tiles greater than 3600 cm 2 (558 in. 2 ), with x ≥ 410 mm (16 in.) and 205 mm (8 in.) < y ≤ 410 mm (16 in.).ASTM C373 pdf download.