A-A-2581
Water resistance. Distilled water with a pouring temperature of 160 degrees Fahrenheit + 2 degrees Fahrenheit shall be poured onto the test plate surface to a depth of approximately one-half the total depth of the plate. The plate shall rest on a flat sheet of double faced corrugated board approximately 1/4 inch thick, with a sheet of clean, white bond paper between the plate and the supporting surface. After a minimum of 30 minutes the water in the test shall be drained into a clean flask and the test plate then examined for evidence of delamination. Separation of plies extending more than 1/4 inch in diameter shall be considered delamination. The bond paper and the underside of the test plate shall be examined for visible evidence of water leakage. Slight dampness of the paper due to condensation shall not be considered as a failure. Any sign of delamination or water leakage shall constitute failure of the test.
Odor and taste. The distilled water used in the resistance to water test shall be collected and allowed to stand in a clean, stoppered flask for two hours. At the end of the two hours, the odor and taste of the sample water shall be compared with that of freshly distilled water contained in a stoppered flask for the same length of time and at the same temperature.
Grease resistance. Place a mixture of 3 ml of food grade corn oil, and 10 grams of clean, dry sand, of such particle size that all of it will pass through a No. 20 U.S. Standard sieve, in a 50 ml glass beaker and heat it in an oven to 160 degrees Fahrenheit. Remove the hot mixture from the oven the swirl the beaker and contents to assure thorough mixing of the sand and oil. Cover the beaker with the eating surface of the test plate. Invert the test plate and beaker and place the plate on a hard, flat surface with a sheet of clean, white bond paper directly under the plate with the beaker in a inverted position over the oil and sand mixtures. Allow the mixture to stand, as specified, for 30 minutes. At the end of the 30 minutes, examine the bond paper and the underside of the test plate for any evidence of staining. Evidence of staining shall constitute noncompliance.
Reflectance. The plate shall be tested for reflectance in accordance with ASTM E97. Three plates shall be tested and the results averaged. Any average less than 71 shall be considered noncompliance.
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