Clean room parameters are a complex problem. With the progress of technology, there are more and more industries using clean rooms. Clean rooms in different industries have different parameters, so the technical parameters are also

More and more. The microelectronic industry has a high requirement for the concentration of airborne particles. The medical industry has a high requirement for the concentration of airborne bacteria. Precision measurement and precision machining industries for temperature and vibration

Dynamic requirements are higher. In view of the above situation, the technical parameters of clean room can be divided into two categories: basic parameters and special parameters.

Two, the basic parameters of clean room

1. The cleanliness

Cleanliness is the most important and basic technical index of clean room, its unit is: the number of particles with particle size not larger than a certain scale in the air per unit volume. Microelectronics industry for clean

Degree of the highest requirements, followed by the optoelectronics industry.

2. Microbial concentration

Microbial concentration is another important technical index of clean room, its unit is: the number of microorganisms in the air per unit volume. The bioengineering industry requires the highest concentration of microorganisms

High, followed by medical, pharmaceutical, food, beverage, cosmetics and other industries. There are many kinds of microorganisms, including viruses, bacteria, fungi, algae, spores, pollen, mites and so on. air

Microbes are part of the particulate matter in the air, or rather the more harmful part. The usual measure is the concentration of bacteria in the air.

3 the temperature

Temperature is the basic working condition, almost all clean rooms have clear requirements for temperature. Temperature will affect the size of the body, thus affecting the accuracy of processing, so precision

Processing has quite strict requirements for temperature. Temperature will affect the parameters of the instrument, resulting in measurement error, so precision measuring instruments for high temperature requirements.

4. The humidity

Humidity is also the basic working condition, almost all clean rooms have clear requirements for humidity. Excessive humidity can cause chemical reactions of many substances, thus affecting product quality

And even make the equipment invalid and the product scrapped. Too low humidity will dehydrate many substances and lose their original function.

5. Wind speed and volume

Sufficient wind speed and air volume are the guarantee of cleanliness. Excessive wind speed and air volume not only waste energy, but also sometimes affect the normal work.

6. Pressure and differential pressure

Normal air pressure is essential for normal operation. The necessary differential pressure is to control the leaky stomach. In order to ensure cleanliness in the clean room of the microelectronics industry, air with low cleanliness is not allowed to be high

Leakage in cleanliness area. Indoor air is not allowed to leak to the outside of the virus laboratory or infection ward.

Noise of 7.

Excessive noise will not only affect normal work, but also affect the health of personnel. Reducing noise is a basic requirement of clean room.

8. Intensity of illumination

Proper illumination is a necessary condition for normal operation.

Three, special parameters of clean room

1. The vibration

Vibration will affect the stability of the instrument and equipment, thus affecting the accuracy of the instrument, but also affect the processing accuracy of the equipment, so some clean rooms need to control the vibration.

2. The electrostatic

Static electricity has many hazards, especially easy to damage the microelectronics components, so the microelectronics industry needs to strictly control static electricity.

3. Concentration of harmful gas

There are many kinds of harmful gases, some will damage human health, and some will affect the quality of products and the qualified rate of products. The concentration of harmful gases needs to be controlled in the clean room.

4. Radiation intensity

X - ray, 7 - ray, electromagnetic wave and other radiation to the human body have greater damage, and sometimes production equipment or products also have damage.