Figure 4. Specimen of wood exposed for 1 year at mud line. 



Harbor Exposure Tests 



Two of the test racks with specimens all mounted as in Figure 2 

 were placed in the black and anaerobic bottom sediments of the Port 

 Hueneme harbor. One of the racks was recovered after 1 year, and the 

 specimens were examined to obtain data for a preliminary report on the 

 durability of plastics in anaerobic sediments [4]. The other rack was 

 exposed partially buried in the anaerobic bottom sediments for 2-1/2 

 years (Figure 3) . 



The third of the replicate test racks on which the specimens of 

 polymeric materials were mounted was suspended for 2-1/2 years from the 

 materials -testing dock at Port Hueneme. This rack was exposed at a 

 depth of 3 feet below the low tide line. (Figure 5 shows the fouling 

 organisms attached to the rack after this period.) 



The fourth and final replicate test rack was stored in the labora- 

 tory for a period of 2-1/2 years, and the specimens were maintained as 

 controls. 



