. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Figure 33. Photomicrograph of borer damage on surface of a vinyl tube. Some of the borer holes are about 1/32 inch in diameter and about l/32 inch deep. Wrappings Around Plastics. The burlap wrappings were moderately deteriorated by microbial activity, and the material could easily be torn apart by hand. The rubber electrical tape wrappings were not affected by marine organisms, although there was a light hydroid growth on the rubber material. Slight cracks were present in the rubber, and these were probably produced by t
. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Figure 33. Photomicrograph of borer damage on surface of a vinyl tube. Some of the borer holes are about 1/32 inch in diameter and about l/32 inch deep. Wrappings Around Plastics. The burlap wrappings were moderately deteriorated by microbial activity, and the material could easily be torn apart by hand. The rubber electrical tape wrappings were not affected by marine organisms, although there was a light hydroid growth on the rubber material. Slight cracks were present in the rubber, and these were probably produced by the effects of the deep sea environment. The plastic tape wrappings were not affected by marine borers; however, there was some hydroid growth on them (Figure 34). Electrical Insulation ( Thick) on No. 16 Wire. In the laboratory, the insulation of the 15-inch-long wire specimens was examined under a stereoscopic microscope for signs of deterioration. In addition, tests of insulation resistance (non- destructive) and voltage breakdown (destructive) were conducted on these specimens. The results of the electrical tests are presented in Table 6. The entire surface of the silicone rubber insulation, exposed near the sediment, was roughened, and the thickness of the insulation was reduced considerably by the nibbling and chewing action of some unknown marine organisms. The surfaces of other insulations, such as polyvinyl chloride, polyethylene, government rubber styrene (GR-S), and neoprene were not affected. A silicone rubber cement which was used to seal the ends of the wire specimens was neither affected by marine organisms nor by the deep sea environment. 34. 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; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Cal
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