The clean bench can only protect the reagents operating in the workbench from contamination, and does not protect the staff; while the biological safety cabinet is a negative pressure system, which can effectively protect the staff.
The working principle of the clean bench is as follows: the air is sucked into the pre-filter through the fan, filtered by the high-efficiency filter through the static pressure box, and the filtered air is sent out in the state of vertical or horizontal airflow, so that the operating area can reach the cleanliness level of class 100. , to ensure the production of environmental cleanliness requirements.
According to the direction of airflow, the clean bench is divided into Vertical Flow Clean Bench and Horizontal Flow Clean Bench. According to the operation structure, the clean bench can be divided into two forms: unilateral operation and bilateral operation, and can be divided into ordinary clean bench and biological (medical) clean bench according to its use.
The clean bench is a purification workbench that is used in medical and health, pharmaceutical, chemical experiments and other fields, and provides a sterile and dust-free clean environment. When it comes to clean benches, some people will ask if they are the same as biological safety cabinets.In fact, it is not. The clean bench is sterile and dust-free, so that the reagents operated in the workbench can be protected from contamination.
The biological safety cabinet is used to protect the operator, laboratory environment and experimental materials from exposure to the above operation process when handling infectious experimental materials such as primary cultures, bacterial strains and diagnostic specimens. It is designed to prevent the possible generation of infectious aerosols and extruded objects, and it is particularly safe and can effectively protect the staff.
The main differences between clean benches and biological safety cabinets are the following 3 points:
1. The biological safety cabinet is a safety equipment widely used in scientific research, teaching, clinical inspection and production in the fields of microbiology, biomedicine, genetic recombination, animal experiments, biological products, etc. It is also the first-level protection in laboratory biosafety. The most basic safety protection equipment in the barrier.
2. The clean bench is designed to protect the experimental materials. The air is sucked into the pre-filter through the fan, and filtered by the high-efficiency filter through the static pressure box, and the filtered air is sent out in the state of vertical or horizontal airflow, so that the the operating area has reached the class 100 cleanliness to ensure the production requirements for environmental cleanliness. Only the sample is protected, not the operator.
3. The biological safety cabinets is a negative pressure purification workbench. Correct operation of the biological safety cabinets can completely protect the staff and test samples and prevent the occurrence of cross-contamination; while the clean bench only protects the operating object but not the protection. Clean benches for staff and laboratory environments. Therefore, in the research, teaching, clinical inspection and production of microbiology and biomedicine, biological safety cabinets should be selected and used, but clean benches should not be selected and used.
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