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The dry heat sterilization process is accomplished by conduction; that is where heat is absorbed by the exterior surface of an item and then passed inward to the next layer. Eventually, the entire item reaches the proper temperature needed to achieve sterilization. The proper time and temperature for
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A mechanical convection oven contains a blower that actively forces heated air throughout all areas of the chamber. The flow created by the blower ensures uniform temperatures and the equal transfer of heat throughout the load. For this reason, the mechanical convection oven is the more efficient of
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dry heat sterilization is 160 °C (320 °F) for 2 hours or 170 °C (340 °F) for 1 hour, and in the case of High
Velocity Hot Air sterilisers, 190°C (375°F) for 6 to 12 minutes.
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practiced. It uses hot air that is either free from water vapor or has very little of it, where this moisture plays a minimal or no role in the process of sterilization.
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There are two types of hot air convection (Convection refers to the circulation of heated air within the chamber of the oven) sterilizers:
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Items should be dry before sterilization since water will interfere with the process. Dry heat destroys microorganisms by causing
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An even more efficient system than convection uses deturbulized hot air forced through a jet curtain at 3000ft/minute.
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The presence of moisture, such as in steam sterilization, significantly speeds up heat penetration.
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203:"HVHA TECH | UK | Metafix High Velocity Hot air Sterilisers"
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Instruments and techniques used for dry heat sterilization include
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Dry heat lyses the proteins in any organism, causes oxidative
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189:"029 This page has moved | HAI | CDC"
155:Textbook of Microbiology by Prof. C P Baveja,
22:of an object is one of the earliest forms of
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83:Instruments used for dry heat sterilization
16:Use of dry, hot air to eliminate pathogens
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223:Central Service Technical Manual
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66:Mechanical convection process
241:Sterilization (microbiology)
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129:Sterility assurance level
111:Effect on microorganisms
47:Moist heat sterilization
105:glass bead sterilizers
20:Dry heat sterilization
75:High Velocity Hot Air
61:Mechanical convection
45:Further information:
117:free radical damage
71:the two processes.
214:General References
58:Gravity convection
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123:See also
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103:, and
143:Notes
173:ISBN
157:ISBN
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