What is a clean room? What are the standards for clean rooms

First, what is a clean room?

Clean room refers to the airtight space with good air cleanliness, temperature, humidity, pressure, noise and other parameters controlled according to needs. According to the flow state of the air flow, there are mainly non-one-way flow clean room, one-way flow clean room and vector clean room. According to the properties of
controlled particles, there are industrial clean rooms and biological clean rooms.

Two, clean room classification

ISO14 ** 4 divides the grade of air cleanliness in clean room (area) and related controlled environment according to the index of suspended particle concentration, and only considers the particle swarm with cumulative distribution within the range of 0.1um ~ 0um (low limit). According to particle diameter, it can be divided into conventional particles (0.1um ~ 0um) ultrafine particles (< 0.1um) and macro particles (> 0um).

Three, clean room process standards

Clean room to achieve clean grade, there must be comprehensive measures, including process layout, building plane, building structure, building decoration, personnel and material purification, air cleaning measures, maintenance and management, etc. Among them, air cleanliness measures are the fundamental guarantee to achieve cleanliness level. In terms of clean air, there are mainly the following specific measures:

(1) The air supply to the clean room must be very clean air. Therefore, high efficiency or sub-efficiency filter (low clean level) must be selected as the terminal filter, the air into the clean room, the last level of filtration. In order to protect the terminal filter and prolong its life, the air must be filtered through the medium effect filter first.

(2) According to the grade of the clean room, the airflow distribution flow pattern of the clean room should be reasonably selected, and the eddy current area should be avoided in the working area; Try to make the air sent into the room with high cleanliness directly reach the working area; The flow of air is conducive to the discharge of particles from the return air outlet in the clean room.

(3) There is enough air volume, not only to dilute the dust concentration of the air, but also to ensure a stable flow pattern.

(4) Different grades of clean room, clean room and non-clean room or clean room and outdoor should maintain a certain positive pressure value.

Four, clean room testing eight points for attention

1, the selection of more suitable for the clean room detection principle of the arc corner; 2, the system automatic control operation, double door electronic interlock, and a photoelectric sensor, one-way channel air shower room, from the unclean area into the door, after closing the infrared sensor someone blowing, blowing after the door locked, can only go out of the air shower room; 3, all cold rolled steel plate manufacturing, the outer appearance of electrostatic spray processing; 4, the door, bottom plate, nozzle are made of stainless steel, beautiful and generous; 5, soft key touch type time relay, LED display and set the blowing time, the range of 10-99s adjustable, the double door automatically locked when blowing; 6, the selection of primary and high efficiency two-stage filtration system, with partition high efficiency filter, filtration efficiency is 99.99%, to ensure the purification level; 7, the wind speed of the air nozzle outlet is more than 25m/s, and the wind speed on the human body is more than 18m/s; 8, choose EVA sealing material, high sealing function.