66 



CEMENTS, LIMES. AND PLASTERS. 



TABLE 19. 

 EFFECT OF VARIOUS RETARDERS ON RATE OF SET. 



Use of accelerators. In making dental plaster and plaster for 

 certain other purposes an extremely rapid set is desirable. For this 

 purpose many crystalline salts are available, common salt being one of 

 the best accelerators known. 



