Because of a need to reduce warpage in investment castings, and because of reported success in the use of aqueous polyalkylene glycol solutions for reducing warpage in heat-treated sheet-metal parts, particularly for aluminum alloys, an experiment was designed to include these solutions along with polyethylene glycol solutions in a study of quenching parameters. At the time of the study, the cost of polyethylene glycol was approximately one-third that of polyalkylene glycol. A total of 1032 cast parts was produced from 13 cast-furnace heats for study. Conclusions concerning warpage and mechanical properties were based on 2064 tensile specimens and the cast parts. Warpage was reduced significantly in the two glycol-solution systems. Solutions of 20 and 40 percent, by weight, appeared to be more effective for both polyethylene glycol and polyalkylene glycol. Minimum warpage occurred at a quenching temperature of 210/sup 0/F (98.9/sup 0/C). Warpage in the glycol quenching solutions was less than that which occurred in water at all temperatures studied. The average warpage of the parts was affected by their attitude during quenching. This warpage was caused by differential cooling rates on the forward and rear surfaces of the parts produced by the turbulence created by the downward motion ofmore » the basket during the quenching operation. Parts which displayed thin edges upon approach to the quenching solution showed less tendency to warp than did those which displayed broad surfaces.« less