rMA 



444, 



JUL 



4-U 



Figure 1.5 In copolymer paints, the TBT is part of an impermeable matrix, 

 and is released through a chemical reaction with seawater at the paint 

 surface. New TBT is exposed by gradual erosion of the paint. 



& A Conventional Free-Associated TBT 



• • Cruiser Copolymer T8T 



50 100 150 200 250 300 350 400 



Days of Immersion 



Figure 1.6 Except for an initial spike of rapid release, copolymer paints 

 show a lower release rate than free-association paints. (Figures 1.3 

 through 1.6 are from Anderson and Dalley, 1986) . 



1-8 



