The dry heat resistance of 10 strains of yeast was investigated to develop data useful for the evaluation of aseptic systems for packaging acid products and which sterilize containers with hot air. Although three of the strains tested showed little survival at 1 lO"C, four other strains had Dttw~ values between 1 and 4 min. Torulopsis glabraru had a Dt~e.~~ of 0.78 min. Saccharomyces strains showed the highest dry heat resistance, with the most heat resistant strain tested having a D,,,,,~~ of 5 min. The z values for these strains ranged from 9.