What is the usual temperature and time for dry heat sterilization?

Generally speaking, if ordinary articles are sterilized by dry heat, the optimum temperature is 160℃ and the time can last for 2 hours. If glass syringes and other articles are sterilized, the optimum temperature is 170℃ and the sterilization time is 1 hour. Dry heat sterilization methods include dry baking, incineration or incineration, infrared ray, microwave, etc.

The principle of dry heat sterilization is to kill bacteria and bacterial spores with high temperature in a dry environment, and its object is articles that cannot tolerate hot and humid steam and cannot be sterilized with high pressure steam. For example, chemicals that must be kept dry, or anhydrous oil, ointment, glycerin, etc. It can be sterilized by dry heat sterilization.

Disinfection can be carried out directly in the oven. Dry heat sterilization can't be used for heat-resistant materials, because it does great damage to some heat-resistant materials.

The difference between dry heat sterilization and wet heat sterilization;

1, the sterilization effect is different.

At the same temperature, the sterilization effect of damp heat is better than that of dry heat. Because the temperature required for protein solidification is closely related to its water content, the higher the water content, the lower the temperature required for solidification. The moisture absorption effect of wet-heat sterilization of protein bacteria is better, and the water absorption effect of dry-heat sterilization is worse, so the effect of wet-heat sterilization is much better than that of dry heat.

2, sterilization temperature is different

Dry heat sterilization requires higher temperature than wet heat sterilization. Dry heat sterilization is usually carried out in a drying box. 160- 180℃ heating for 2 hours can kill all microorganisms. Hygrothermal sterilization can kill bacterial propagules by boiling at100 C for 5 minutes.

3, sterilization medium and time are different

Dry heat mainly uses air, while wet heat uses water vapor. Dry heat usually lasts for 30 minutes, 1 hour, 2 hours, etc. , but the whole process of damp and heat is less than 1 hour.