DETERIORATION OF ORGANIC POLYMERS 1101 



absorbers of ultraviolet light are much less effective in cellulose esters. Some 

 of them actually are sensitizers. Even in cellulose esters Salol at a concentra- 

 tion of 1% is a poor second to carbon black, giving in accelerated tests less 



than half the life imparted by 1% of a well dispersed, finely divided carbon 

 black.^7 (Fig 14) 



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