It is important to always take into account that the microbicidal action of heat is conditioned by the presence of organic matter or dirt on the materials. This applies, for example, to oil or fat for cases in which the microorganisms are protected from heat-based action.
Dry heat penetrates slowly in materials, which means that long exposure periods are required. Hot air is not corrosive but the process is slow. It is usually used at 170 ؛C for 60 minutes or 150 ؛C for 150 minutes.
This system eliminates microorganisms through coagulation of the proteins in the microorganisms. Its effectiveness depends on:
• the diffusion of the heat
• the quantity of heat available and
• the levels of heat loss.
Types of stoves or Poupinell
There are two types of stoves that are commonly used: the gravity convection stove and the mechanical convection stove (forced air circulation).
Gravity convection stove
This stove consists of a covered chamber with electric resistance on its interior wall and a channel or orifice for air drainage on its upper wall. Circulation depends on the currents produced by the rise in temperature and shock due to differences in temperature. For these reasons, its process is slower and less uniform.
Mechanical convection stove
This stove has a device that produces the rapid movement of a large volume of hot air, facilitating the transmission of heat directly to the load or package. Less time is used and it offers thermal balance.
Monday, June 24, 2024
Refrences
Sterilization manual for health centers
Please Check out file at the following link
Inactivation of pathogenic agents from blood on equipment and in the environment
Disinfection of elements contaminated with HBV, HIV or Mycobacterium tuberculosis
Implantable objects and Anesthesia masks disinfection
Dental instruments disinfection
Tonometers, diaphragm rings and cryosurgery instruments disinfection
