Unclassified 



DOCUMENT CONTROL DATA -R&D 



U. S. Naval Civil Engineering Laborator 

 Port Hueneme, California 93041 



Unclassified 



DEEP-OCEAN BIODETERIORATION OF MATERIALS - PART VI. ONE YEAR AT 2,370 FEET 



Final; Feb 1965 to Vug°'l 966 " 



i.dd/e imlial. lesl name) 



Muraoka, James S. 



May 1967 



Z-F015-01-99-006 



NO(5) (Any oihe 



Distribution of this report is unlimited. Copies available at the Clearinghouse for Federal Scientifi 

 & Technical Information (CFSTI), Sills Building, 5285 Port Royal Road, Springfield, Va. 22151 

 Price $2.00 



Naval Facilities Engineering Command 



As Part VI of a series of reports on the biological deterioration of materials in the deep 

 ocean, this report covers the data obtained after exposing metallic and nonmetallic specimens for 

 13.4 months on the floor of the Pacific Ocean at a depth of 2,370 feet (Test Site II). The speci- 

 mens were attached to a Submersible Test Unit that was emploced in April 1965 and retrieved in 

 May 1966. Preliminary examination of the specimens was made aboard ship, and the final exami- 

 nation, tests, and analyses were performed at the Naval Civil Engineering Laboratory. 



On recovery, most of the plastic materials and all of the rope specimens were covered with 

 bacterial slime. Cotton and monila ropes were severely deteriorated by marine microorganisms. 

 Wood panels, certain plastics, and manila ropes were attacked by molluscan borers. Some of the 

 plastics were attacked by borers directly from seawater environment without the aid of wood bait 

 pieces. Hydroids and tubeworms were found on metal panels. Sea anemone, snails, and crabs 

 were also found attached to various test panels. The surface of a silicone rubber electrical cable 

 insulation was deteriorated by some marine organisms. Typical fouling organisms such as 

 barnacles and bryozoa were not found. Glass, elastomers, and certain plastics were not adversely 

 affected. Data from evaluation of these specimens are presented. 



DD 



.,1473 



S/N 010 1-607-680 1 



1 InrlfiBsififiH 



