Abstract: A circular saw is made with carbide-tipped teeth arranged in pairs to effect a so-called "triple-chip" cutting operation for thermoplastic materials. Both teeth of each operational pair have two negatively-raked cutting edges which slope toward each other at the outer extremity of the teeth to a transverse radially outermost cutting edge. The so-called "high" tooth of each pair has its transverse cutting edge radially offset a greater distance from the rotational axis of the saw than the corresponding transverse edge of each low tooth. The lateral negatively-raked cutting edges of each low tooth are laterally separated a greater distance than the corresponding sloping cutting edges of the high tooth. Saws of this character are specially useful for cutting plastic materials and particularly materials such as acrylics and vinyls.