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Dry Heat Sterilization Processes

Dry heat is primarily used to sterilize instruments and heat-resistible glass and instrument parts. The heat transmission by dry heat is less effective than by airless, saturated steam, because steam is able to transport the heat better, than just air. Apart from that, proteins can be easier denaturized in a wet milieu than in a dry one. This is the reason why higher temperatures and longer times are needed. The dry heat sterilization is carried out in a closed chamber. Bigger apparatusses work with circulating air, i.e. a ventilator circulates the air in order to generate a constant temperature and a faster heat exchange. According to pharmacopies and WHO recommendations the temperature should be between 150 and 250