Figure 27. Polypropylene, nylon, and cotton rope specimens. 



Table 4. Breaking Strength of Rope Specimens Before 

 and After Deep Sea Exposure (STU 11-2) 



Rope Material 



Diam 

 (in.) 



Breaking Strength (lb) 



Unexposed 

 Specimens -v 



Exposed Specimens 



On Bio-Racks^ 



Inside Plastic Tube ^ 



Cotton 

 Manila 



Nylon 

 Polypropylene 



1/2 



1/2 



1/4 

 5/16 



1,340 

 2,068 



1,900 

 1,810 



200 



Completely deteri- 

 orated by marine 

 organisms 



1,482 



1,570 



522 

 1,805 



1,557 

 1,687 



\j Average of 2 specimens 



28 



