Table 3. Materials Used in the Formulation of Insulating Materials Tested 



Test Specimen 



Plasticizer 



Filler 



Antioxidant 



Polyethylene (standard 



— 



— 



— 



polyethylene insulation) 









Polyvinyl chloride 



- 



- 



- 



Government rubber styrene 



Cumarone-indene 



Hard clay and 



Polymerized 



(styrene butadiene rubber) 



resin and micro- 



water-ground 



trimethyl 



GR-S (SBR) 



crystalline wax 



whiting 



dihydroquinoline 



Silicone rubber 



- 



- 



- 



Neoprene (type W) 



Light process oil 



Hard clay 



4, 4 thiobis 





and petroleum 





(6-tert-butyl 

 m-creosol) 



RESULTS 



Marine Growth on STU Rigging Complex 



Generally there was very little fouling growth on various recovered materials. 

 Hydroids and slime growths were found on the surface of recovered components such 

 as buoys, shackles, polypropylene rope, and pinger casings. Some of the hydroids 

 found attached to the lift line were about 1 inch long. 



Typical fouling organisms such as barnacles, sea squirts, and bryozoa usually 

 found on submerged objects in harbors and shallow water were not found attached 

 to any of the recovered materials. 



Treatment of Recovered Test Materials 



As soon as the recovered STU was placed on the deck of the ship, the test 

 panels were examined, and any attached organisms were photographed. The animals 

 were then carefully lifted from the test specimens and preserved in a 5% glycerol- 

 alcohol solution for further examination and analysis in the laboratory. 



As soon as the STU was secured to the deck, the bio-racks attached to the 

 side of the STU were disassembled (Figure 6). The Individual test specimens were 

 placed in plastic bags for later examinations, tests, and evaluation in the laboratory. 



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