Cleanliness levels and testing methods for cleanrooms

Clean Factory是控制空气中粒子、微生物和有害气体的流动和分布，以Reach特定的生产环境和ProductQuality要求的空间。Cleanliness等级和Testing方法是Clean FactoryDesign和Operation的关键因素。

1、 Cleanliness level

Cleanliness levels are usually classified based on the size and quantity of particles in the air, with the following common levels:

1. Level 100: The number of particles in the air is very small, suitable for high-precision industries such as electronics and precision machinery.
2. Class 1000: Suitable for industries that require high air cleanliness, such as pharmaceuticals, food, etc.
30000 level: suitable for general industrial production environments.
4. 100000 level, million level, etc.: Suitable for places with lower cleanliness requirements.

2、 Testing method

The detection of cleanliness mainly relies on specialized instruments and equipment, and common detection methods include the following:

1. Dust particle counting method: Use a dust particle counter to measure the size and quantity of particles in the air, in order to evaluate the cleanliness level. This method is the most commonly used and direct detection method.
2. Light scattering method: Measuring the distribution and size of particles in the air through laser or light-emitting devices to evaluate cleanliness.
3. Pressure gradient method: using the pressure gradient changes in the clean room to evaluate cleanliness, usually combined with other detection methods.
4. Biological pollution detection method: used to detect the number and types of microorganisms in the air, such as observing suspended particles under a microscope to evaluate their contribution to cleanliness.

The above testing methods are all used to ensure regular inspections of clean rooms after construction and during the production process. To ensure the accuracy of the test, relevant operating procedures and standards should be followed. At the same time, it is crucial to choose the appropriate cleanliness level and testing method based on actual needs and industry requirements.

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