POLYCYCLIC AROMATIC-HYDROCARBONS IN QUENCH OILS

The results of experiments to monitor the build up of polycyclic aroma tic hydrocarbons (PAH) in quench oils during use are presented. Oils f rom four quenching baths at three heat treatment companies were sample d at intervals over periods of 6-18 months. Information was obtained f rom the operators on the frequency of topping up the oil; bath tempera ture and other relevant parameters. The oils were analysed quantitativ ely for PAH to observe any changes in concentrations during use and to relate operating conditions to PAH levels. The expected increase of P AH over time was not observed and possible explanations for this are d iscussed. Crown copyright (C) 1996 Published by Elsevier Science Ltd.