Physical Methods Sterilization – Dry heat

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


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