polyester carcass covered by top and bottom RMA Grade 2 rubber covers. 

 The belt measured 2-3/8" x 1/2". 



2- Uniroyal Royalon. This is a multiple-ply belt. The belt tested was a three- 

 ply belt, i.e. it had three layers of a synthetic polyester carcass fabric, and 

 an RMA Grade 2 top and bottom cover with an ASTM compound 

 specification SBR. The belt measured 2" x 30/64" and had a conventional 

 or plain weave, 



3- Goodyear. This is also a multiple-ply belt^ a two-ply nylon belt, with RMS 

 Grade 2 covers. The material measured 2-1/8" x 7/32", The rubber covers 

 were ASTM compound specification SBR, and the nylon was woven in a plain 

 weave. 



4- Empire State. The belt that was tested was a multiple-ply belt, with a two- 

 layer synthetic fabric carcass. The fabric is woven in a plain weave. The 

 rubber covers are RMA Grade 2, with an ASTM compound specification SBR. 

 The belt was supplied by Empire State Belting and Hose company and 

 manufactured by B.F. Goodrich. The material measured 1-61/64" x 3/8", 



The Uniroyal UsFlex and Goodyear samples were immersed in salt water in Port Jefferson 

 Harbor on the North Shore of Long Island. To test these concepts, the belting samples 

 were tied together to form two long rubber belts. One belt held a 36-foot sail boat in the 

 inner harbor, and the other held a 33-foot Silverton power boat in the outer harbor. The 

 chain in the inner harbor showed heavy barnacle growth. The rubber was not damaged by 

 this growth. "Rie typical arrangement used is shown in Figure 7. 



In addition to being in the water for approximately seven and one half months, these belts 

 were exposed to the environment in the marina yard as any ordinary chain used in 

 moorings would be. They were exposed to snow, ice, rain and sun for approximately two 



and one half months before being tensile tested. 



27 



