Accession Number : ADA017701

Title :   Durability of Plastics in Anaerobic Marine Sediments.

Descriptive Note : Final rept. 1 Jul 72-31 Jun 75,


Personal Author(s) : Muraoka,J. S. ; Vind,H. P.

Report Date : OCT 1975

Pagination or Media Count : 18

Abstract : Specimens of a wide variety of plastic sheets, ropes, and electrical cable insulations were partially buried in anaerobic harbor sediments to determine the effect of hydrogen sulfide on polymeric materials. For comparison, specimens of the same materials were exposed in aerobic surface waters. After 2-1/2 years, the specimens were all recovered. Very little change was noted in the appearance, strength, or hardness of any of the specimens of synthetic polymeric materials. In contrast, nothing remained of samples of wood and short lengths of cotton and hemp rope exposed for comparison. Similarly, natural rubber covers of samples of insulated electrical cable deteriorated during the 2-1/2 years, but plastic and synthetic rubber covers of other insulated cables underwent no visible deterioration. (Author)

Descriptors :   *Plastics, Synthetic rubber, Life expectancy, Sea testing, Ocean environments, Exposure(General), Hydrogen sulfide, Mud, Deterioration, Anaerobic processes, Harbors, Aerobic processes, Comparison, Wood, Cotton, Natural rubber, Performance(Engineering), Hardness, Tensile strength, Moisture, Absorption(Physical), Electrical insulation, Panels, Rope, Hydrophobic properties, Polycarbonates, Polyethylene plastics, Polypropylene, Polystyrene, Tetrafluoroethylene resins, Polyvinyl chloride

Subject Categories : Plastics
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE