Sterilization with FormaldehydeIt is a sterilization process applied with low atmospheric pressure and low temperature of saturated steam and formaldehyde mixture [LTSF (Low temparature steam and formaldehyde = Low Temperature Steam and Formaldehyde)]. Pure formaldehyde is a colorless, flammable, toxic gas, highly soluble in water. Commercially used 35-40% solution called formol or formalin is used. Formaldehyde solution is not considered flammable or explosive. Skin contact may cause irritation, breathing, asthma-like breathing problems. In the study areas, the short-term (less than 15 minutes) exposure limit was 2 ppm, and the 8-hour exposure limit was 0.75 ppm.
As with ethylene oxide, people who use formaldehyde sterilizers should have regular health checks. Formaldehyde gas is obtained by evaporating under formalin negative pressure in the sterilization cabinet. Sterilization is provided under 60-80% humidity in the environment, 8-16 mg formaldehyde concentration per liter and 50-80 ° C temperature conditions.
In formaldehyde sterilization, as in pressurized steam, vacuum is applied in the preliminary stage, and the air inside the cabinet is evacuated.
Steam is injected into the cabin and the load is heated to the desired temperature. After that, several formaldehyde gas injections are made several times. At the end of the process, the formaldehyde residues in the cabinets and packages are first removed by steam and by repeated washing with air. The materials are ready to use without the need for additional ventilation after the procedure.
References: Dezenfeksiyon Antisepsi Sterilizasyon Rehberi 2019