. Durability of plastics in anaerobic marine sediments. Plastics; Marine sediments; Materials. Figure 5. Rack of specimens engulfed in fouling after 2-1/2-year exposure near ocean surface. Measurements of Water Absorption The panels of plastic sheeting were removed from the test racks and cleaned immediately after they were removed from the harbor. The large fouling organisms were removed with a large putty knife, and the panels were scrubbed in seawater with a steel wire scrubbing pad. They were then rinsed in distilled water, wiped with paper towels, and air dried for 10 minutes to remove su
. Durability of plastics in anaerobic marine sediments. Plastics; Marine sediments; Materials. Figure 5. Rack of specimens engulfed in fouling after 2-1/2-year exposure near ocean surface. Measurements of Water Absorption The panels of plastic sheeting were removed from the test racks and cleaned immediately after they were removed from the harbor. The large fouling organisms were removed with a large putty knife, and the panels were scrubbed in seawater with a steel wire scrubbing pad. They were then rinsed in distilled water, wiped with paper towels, and air dried for 10 minutes to remove surface moisture. The panels were weighed to determine the weight of the panels plus the moisture they had absorbed. The panels were stored for 2 weeks in a 37 C drying room to remove the absorbed water from the panels; they were then weighed daily until their weights were constant. The loss in weight from the initial to the final weighing were measures of the moisture absorption of the panels (Table 1) Hardness Tests Measurements of the hardness of the dried panels of rigid plastic sheeting were conducted by the ASTM method described in Reference 5. A type A durometer was employed for testing the sheets of polyurethane and a type D durometer for all of the others. The average of five readings was used for each measurement (Table 1).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Muraoka, James S; Vind, Harold P; Naval Construction Battalion Center (Port Hueneme, Calif. ). Civil Engineering Laboratory. Port Hueneme, Calif. : Civil Engineering Laboratory, Naval Construction Battalion Center
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