2026-04-13Views：
The standard for oil-free compressed air is mainly defined according to the international standard ISO 8573-1, which specifies the classification and purity level of pollutants in compressed air, including solid particles, water (humidity) and oil. In the context of oil-free compressed air, a particular concern is the content of oil contaminants.
Overview of Oil-Free Compressed Air Standards
according to the ISO 8573-1 standard, oil-free compressed air usually refers to compressed air with an extremely low oil content, which is almost negligible. Specifically, the highest level of oil-free compressed air, Class 0, requires that the oil content in the compressed air be less than 0.01 mg/m & sup3;. This standard is based on rigorous testing methods and is designed to ensure that the purity of the compressed air meets the requirements of applications that are extremely sensitive to oil contamination.
Standard Details
Class 0 standard:
oil content requirement: less than 0.01 mg/m & sup3;. This is a key indicator to measure whether the compressed air has reached the oil-free level.
Scope of application: Suitable for industries that are extremely sensitive to oil pollution, such as food and beverage processing, pharmaceutical manufacturing, semiconductor production and optical instrument manufacturing.
Test method:
ISO 8573 specifies a variety of test methods, including partial flow (B2) test method and full flow (B1) test method. These tests are designed to comprehensively assess the presence of all types of oil contaminants in compressed air, including mist, liquid and gaseous oils.
The full flow (B1) test method is considered more stringent because it enables a comprehensive analysis of the entire gas stream and detects both hazy and liquid oils.
Industry differences:
in addition to the ISO 8573-1 standard, different industries and sectors may have their own specific requirements. For example, in the Chinese Pharmacopoeia and GMP, the oil content of compressed air is required to be ≤ 0.1 mg/m & sup3;; Medical compressed air is also ≤ 0.1 mg/m & sup3; in the European Pharmacopoeia;.
The standard of diving breathing compressed air in different countries is also different, such as the United States and China require oil content <5 mg/m & sup3;, while the United Kingdom is <1 mg/m & sup3;.
Conclusion
the standard of oil-free compressed air is mainly based on ISO 8573-1, of which Class 0 is the highest grade, and the oil content is required to be less than 0.01 mg/m & sup3;. However, specific standards may vary by country, region and application area. In practical applications, relevant standards and regulations should be consulted according to specific conditions to ensure that the purity of compressed air meets specific needs.
Please note that the above information is for reference only, and specific standards may be adjusted over time and industry changes. In practice, it is recommended to consult professional bodies or consult the latest standard documents for accurate information.
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