Toxicological Evaluations are critically assessed data and recommendations for occupational safety officers, industrial hygienists, and human and animal toxicologists. They are compiled and constantly reviewed under internationally coordinated programms for establishing the risk potential of existing chemicals to prevent health hazards at the working place. In this seventh Volume, data for the following chemicals are published: N,N'-Diphenyl-p-phenylenediamine, Benzotrifluoride, Carbonic acid diethyl ester, Cyanuric acid, Tetrahydrothiophene, 1,4-Butanediol, Trioxane, Diethylenetriamine, 4-Aminobenzene sulfonic acid, Acetoacetic acid ethyl ester, N-Methylolmethacrylamide, Tetrafluoroboric acid, 4-Isopropalphenylisocyanate.