1、 Preparation before operation
1. Environmental inspection
Ensure good sealing of the sterilization space, turn off the fresh air and exhaust systems to prevent gas leakage.
Check the operation status of the sterilizer and ventilation system to confirm that there is no risk of leakage.
2. Parameter calculation
Calculate the amount of formaldehyde used based on the volume of sterilization space (including rooms and air ducts), and generally prepare a 40% formaldehyde solution at 10ml/m ³.
If you need to accelerate the volatilization of formaldehyde, you can mix it with potassium permanganate (usually in a ratio of 2:1, such as 10ml formaldehyde mixed with 5g potassium permanganate).
2、 Sterilization operation process
1. Introduction and diffusion of formaldehyde
Pour the formaldehyde solution into the heating device or specialized container of the sterilizer. If potassium permanganate is used, it should be placed in an open container and poured into the formaldehyde solution.
Activate the return air system, turn off the fresh air and exhaust air, and promote the uniform diffusion of formaldehyde gas throughout the sterilization space.
2. Fumigation and disinfection stage
Maintain a sealed state and continue fumigation disinfection for 6-12 hours (specific duration adjusted according to microbial load and temperature).
Control the temperature and humidity of the environment, with a recommended temperature of 24-40 ℃ and humidity of around 65% to enhance the sterilization effect.
3. Neutralization and Purification
After disinfection, add 25% ammonia solution to the air cabinet or spray it into the space to neutralize residual formaldehyde.
Turn on the air supply and return system for 6 hours, then start the fresh air and exhaust system to replace the air for 4 hours to ensure complete removal of formaldehyde gas.
3、 Safety and Precautions
1. Personnel protection
Wear protective equipment such as gas masks and gloves during operation to avoid direct contact with formaldehyde gas.
Personnel are prohibited from entering during the fumigation and neutralization stages. After purification is completed, ventilation and residual concentration testing are required.
2. Equipment maintenance
Regularly check the sealing and pipeline patency of the sterilizer to ensure the effectiveness and uniformity of formaldehyde vaporization and diffusion.
Low temperature steam formaldehyde sterilizer needs to pay attention to temperature control (usually 50-80 ℃) to avoid high temperature damage to heat sensitive items.
4、 Applicable scenarios and limitations
1. Applicable objects: medical devices, clean room air, thermal sensitive items (such as plastic products, optical instruments, etc.).
2. Restriction: Formaldehyde is carcinogenic and must strictly comply with safety regulations; Not suitable for materials such as food and textiles that are prone to formaldehyde adsorption.