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2.2.1.2 Dry Heat
The sterilizing effect of dry heat is due to oxidation of intracellular components and extreme dehydration. This requires very high temperature to achieve the required effect. Dry heat is applied to sterilize materials which include glass petridishes, pipettes, flasks and metal objects in hot air oven, which is electrically heated and thermostatically controlled (oils, waxes and powder are also sterilized in hot air oven) The operation or use of hot air oven includes
The temperature should be brought down to less than 80oC before opening the oven to prevent glasswares from cracking as a result of too rapid fall in temperature. |