Requirements for solid particle content of compressed air

The solid particle content requirements of compressed air vary according to the application field and specific scenarios. The international standard ISO 8573-1 and the domestic standard GB/T 13277.4 provide detailed classification and measurement methods. The following are specific instructions:

1. international standard: ISO 8573-1

ISO 8573-1 classifies particulate matter in compressed air into 0-5 levels, measured by the number of particles of a specific size per cubic meter of air:

• level 0: The most stringent, requiring no more than 100 particles ≥ 0.1μm per cubic meter of air, which is suitable for scenarios with extremely high air cleanliness requirements, such as electronic chip manufacturing, pharmaceutical production, etc.
• Level 1: The number of particles ≥ 0.1μm per cubic meter of air does not exceed 1000, suitable for precision instrument manufacturing, laboratory research, etc.
• Level 2: The number of particles ≥ 0.1μm per cubic meter of air does not exceed 10,000, which is suitable for general industrial production, such as automobile manufacturing and mechanical processing.
• Level 3: The number of particles ≥ 0.5μm per cubic meter of air does not exceed 100,000, which is suitable for scenes with low air quality requirements, such as ordinary pneumatic tools, textile industry, etc.
• Levels 4 and 5: Higher particulate matter content, suitable for scenes with less stringent air quality requirements, such as construction sites, agricultural equipment, etc.

2. domestic standard: GB/T 13277.4

GB/T 13277.4-2015 "Compressed air Part 4: Solid particle measurement method" specifies the measurement method of different size particle concentration in compressed air, which is suitable for compressed air system with pressure in the range of 0.1 MPa to 4.0 MPa. This standard corresponds to ISO 8573-4 and provides a variety of measurement methods, including light scattering, microscopic counting and filter weighing, to ensure the accuracy and comparability of measurement results.

3. the specific requirements of different application areas

1. pharmaceutical Industry:
   • the solid particle content is very demanding, usually meeting ISO 8573-1 level 0 or 1.
   • For example, compressed air in direct contact with drugs requires the number of particles of 0.1-0.5μm ≤ 100/m & sup3;, and the number of particles of 0.5-1.0μm ≤ 1/m & sup3;.
2. Electronic industry:
   • the air cleanliness requirements are extremely high, and the particulate matter content in the compressed air should be very low, and the particle size is generally less than 0.1 μm.
   • For example, in semiconductor manufacturing, compressed air is required to meet stringent particulate content requirements to prevent damage to electronic components or affect their performance.
3. Food Industry:
   • compressed air should be strictly filtered to ensure that the content of microorganisms and particulate matter meets food safety standards.
   • The particle size of the solid particles should generally be less than or equal to 1 μm to prevent impurities such as dust from affecting the quality of the food.
4. Textile Industry:
   • the dryness of compressed air is required to be high, and the pressure dew point needs to reach -20 ℃ to prevent moisture from affecting textile materials.
   • The particle size of dust should be less than 1 μm to avoid the impact of dust and other impurities on the quality of textile products.
5. Automotive industry:
   • the oil content in the compressed air needs to be strictly controlled to prevent the oil from affecting the coating quality and lubrication performance of auto parts.
   • The dryness of compressed air is required to be high, and the pressure dew point usually needs to reach -20 ℃ to -40 ℃ to prevent moisture from corroding parts or affecting their performance.