It is used to sterilize or dry glass and metal material used in examinations or tests, which is converted to the laboratory and comes from the washing section, where it is sent after being used in a procedure. Sterilization carried out in the oven is called dry heat and is carried out at 180 ° C for 2 hours; Glassware, when heated by high temperature air, absorbs moisture and eliminates the possibility of maintaining any biological activity due to high temperatures and times used.
Quality control on stoves is a bit difficult to achieve because the dry heat sterilization technique has the critical temperature and time setting. In general, the spores of Bacillus Subtilis, the Niger variety, which must be incubated for several hours after the use of the sterilization process as biological indicators. The initial spore load of the biological indicator varies between 5 x 105 and 1 x 106. Its effectiveness depends on the diffusion of heat, the amount of heat available and the loss of heat. The action of the microbicide is conditioned by the presence of organic matter or dirt in the article. Dry heat sterilization should be limited to materials that cannot be autoclaved.