Unclassified 



Security Classification 



DOCUMENT CONTROL DATA - R&D 



ol litle. body ol abslr. 



s( be entered when the 



1 ORIGINATIN G ACT|v|ty (Corporate author) 



U. S. Naval Civil Engineering Laboratory 

 Port Hueneme, California 93041 



REPORT SECURITY CLA 



Unclassified 



2b GROUP 



3. REPORT TITLE 



"Deep-Ocean Biodeterioration of Materials — Part V. Two Years at 5,640 Feet." 



A. DESCRIPTIVE NOTES (Type ol report and inclusive dates) 



July 1963 - February 1966 



5 AUJHOR(S) (Last name, lirst name, initial) 



Muraoka, J. S. 



6 REPO RT DATE 



November 1966 



7a. TOT 



59 



MO. OF PAGES 



7b. NO. OF REFS 



10 



CONTRACT OR GR.* 



9a. ORrGINATOR'S REPORT NUMBERC5; 



b. PROJECT NO. Z-F015-01 -99-006 



TR-495 



9b. OTHER REPORT NO(S) (A ny other numbers that tray 

 this report) 



be assigned 



10. AVA IL ABILITY/LIMITATION NOTICES 



Distribution of this document is unlimited. 



Copies available at the Clearinghouse (CFSTI) $3.00. 



11. SUPPLEMENTARY NOTES 



12. SPONSORING MILITARY ACTIVITY 



Naval Facilities Engineering Command 



13. ABSTRACT 



As Part V 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 24 months on the floor of the Pacific Ocean at a depth 

 of 5,640 feet. The test specimens were attached to a Submersible Test Unit that was 

 placed on the sea floor on 2 October 1963 and was recovered on 22 October 1965. 

 Preliminary visual examination of the recovered test specimens was made aboard 

 ship, and the final examination, tests, and analyses of these materials were performed 

 at the Naval Civil Engineering Laboratory. 



Most plastic specimens and all rope specimens were covered with bacterial slime. 

 The cotton and manila ropes were severely deteriorated by marine microorganisms. 

 Wood panels and manila ropes were riddled by marine borers. The surface of all the 

 plastic materials in direct contact with wood were deteriorated by these borers. 

 Glass, rubber, and certain plastic materials were not adversely affected. 



The results of breaking-strength tests on ropes, hardness and moisture absorption 

 tests on plastics, and insulation resistance and voltage breakdown tests on electrical 

 insulating materials are presented in this report. 



DD /.?re. 1473 



0101-S07-6S00 



Unclassified 



Security Classification 



