What is the standard of dust-free workshop?

Dust-free workshops can be divided into the following levels: 1, 100, 1000,100000,100000, 300000,100000.

The number of dust particles with a particle size less than 0.5 micron per cubic meter is controlled below 3500, reaching the international dust-free standard A level. At present, the dust-free standards applied to chip-level production and processing have higher requirements for dust than A-level, and such high standards are mainly applied to the production of some higher-level chips. The amount of dust is strictly controlled within 65,438+0,000 per cubic meter, which is also called thousand-level in the industry.

The choice of clean workshop address should be in line with the principles of favorable production, convenient life, saving investment and operating expenses. The distance between the dust-free workshop and the main traffic road should be more than 50 meters.

The site should be selected in an area with good natural environment and water quality, low atmospheric dust concentration, and microclimate caused by topography and geomorphology, which is conducive to production and energy saving. Keep away from areas that emit a lot of dust, smoke, toxic gases and microorganisms, such as airports, railways, docks, traffic arteries, etc. , and in the windward side of the pollution source and the dominant wind direction throughout the year, and there is a certain protective distance.

Extended data:

Eliminate pollutants such as particulate matter, harmful air and bacteria in the air within a certain space range, and control indoor temperature, cleanliness, indoor pressure, airflow speed and distribution, noise and vibration, lighting and static electricity within a certain demand range to provide specially designed rooms.

In other words, no matter how the outside air conditions change, the room can maintain the original required cleanliness, temperature, humidity and pressure.

Similar to the diffusion effect, when the filter material is electrostatic (electret material), the longer the dust stays in the filter material, the greater the possibility of being adsorbed by the material. Changing the wind speed will obviously change the filtration efficiency of electrostatic materials. If you know that there is static electricity on the material, you should design the air conditioning system to minimize the airflow through each filter.

According to the traditional theory, when the wind speed decreases, the probability of dust colliding with fibers will decrease, and the filtration efficiency will also decrease. However, in practice, this effect is not obvious, because the wind speed is small, the rebound force of fibers to dust is also small, and dust is easier to adhere to.