There are many types of ethylene oxide sterilizers currently in use, with large containers having tens of cubic meters, medium ones having 1-10 cubic meters, and small ones having a fraction to one cubic meter. They each have different purposes.
 
I. Large ethylene oxide sterilizer:
Large ethylene oxide sterilizer is generally used for the sterilization of a large number of processed items, the dosage is 0.8kg/m³～1.2kg/m³, and the sterilization time is 6 hours at 55℃～60℃.
 
II. Medium ethylene oxide sterilizer:
Medium ethylene oxide sterilizer is generally used for the sterilization of disposable medical supplies. This kind of sterilization equipment is complete and highly automated, and can be used with pure ethylene oxide or a mixed gas of ethylene oxide and carbon dioxide. The generally required sterilization conditions are: concentration, 800 mg/L～1000mg/L; temperature, 55℃～60℃; relative humidity 60%～80%; sterilization time 6h. Vacuum is required to complete the sterilization. Sterilized items are usually sealed and packaged with plastic film permeable to ethylene oxide. If there is a filter membrane that can filter air on the small package, the sterilization effect is better.
 
III. Small ethylene oxide sterilizer:
Small ethylene oxide sterilizer is mostly used in the medical and health sector to process a small amount of medical equipment and supplies. Currently, there are 100% pure ethylene oxide type or a mixture of ethylene oxide and carbon dioxide type. This kind of sterilizer has a relatively high degree of automation. It can automatically vacuum, add medicine, adjust the temperature and relative humidity, and control the sterilization time.
 
The requirements for medium and small ethylene oxide sterilizers are: have good pressure resistance and airtight performance, should be able to withstand a hydraulic test at 1.25 times the working pressure without degeneration and leakage, and can be vacuumed to 53.3 kPa or more; have accurate dosing amount and good heat preservation performance, and can adjust the temperature and relative humidity in the sterilizer; when flushing with ambient air after disinfection, more than 99.6% of particles ≥0.3µm can be filtered out when the input air is passing through a high-efficiency filter; after the discharged residual ethylene oxide is harmlessly treated, the residual ethylene oxide in the sterilized articles should be less than 15.2mg/m; the concentration of ethylene oxide in the sterilization environment should be less than 2mg/m.