Table 10. Deep-Ocean Effects on Insulation Resistance of 

 Electrical Insulating Materials 



Insulating 

 Material for 

 Coiled Wires 



Insulation Resistance (meg) 



Voltage 

 Breakdown?-/ 



Before 

 Exposurel/ 



After 

 Exposurefy 





Exposed Near S 



ediment 





Polyethylene 



20,100,000 



370,000 



Did not fail 



Polyvinyl chloride 



4,400,000 



480,000 



Did not fail 



Silicone rubber 



6,200,000 



60,400 



Did not fail 



Government rubber 









styrene (styrene 



5,500,000 



200,000 



Did not fail 



butadiene rubber) 









Neoprene 



36,000 



27,500 



Did not fail 



Exp 



)osed About 3 Feet 1- 



\bove Sediment 





Polyethylene 



20,100,000 



1,370,000 



Did not fail 



Polyvinyl chloride 



4,400,000 



. 800,000 



Did not fail 



Silicone rubber 



6,200,000 



32,000 



Did not fail 



Government rubber 

 styrene (styrene 

 butadiene rubber) 



5,500,000 



96,0004/ 



One of two 

 wires failed 



Neoprene 



36,000 



32,000 



Did not fail 



Jy Average of eight tests. 



Tj Average of two tests. 



3/ Tested at 1,000 volts AC for 10 seconds. 



4_/ Average of one test. Insulation of one wire deteriorated. 



34 



