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What should the oil content of compressed air in contact with food be less

2026-04-15Views:

According to international standards and industry norms, the oil content of compressed air in contact with food shall be strictly controlled by grading. The specific standards are as follows:

1. direct contact with food scenes (e. g. ingredients, fermentation, stirring)

  • international Standards:
    • ISO 8573-1:2010 Class 1: Oil content ≤ 0.01mg/m³(sum of liquid oil, oil aerosol, oil vapor).
    • 3-A Health Standard: Dairy products and beverage industry equipment requires Class 0 oil-free compressed air, which needs to be realized by oil-free compressor or deep purification.
  • Regulatory requirements:
    • FDA 21 CFR Part 110: It is mandatory to use oil-free compressed air or high-efficiency filtration system to avoid oil pollution.
    • EHEDG Guide: It is recommended to configure the activated carbon oil mist filter combination to ensure that the oil residue meets the standard.
  • Technical support:
    • adopt water-lubricated oil-free compressor to eliminate oil pollution from the source.
    • Equipped with a catalytic oxidation purifier, decomposes oil vapor into CO₂ and H₂ O, ensuring absolute oil-free.

2. indirect food contact scenarios (e. g. packaging workshop, bottle blowing)

  • international Standards:
    • ISO 8573-1:2010 Class 2: Oil content ≤ 0.1mg/m³.
    • Some companies adopt stricter internal standards (such as ≤ 0.05 mg/m & sup3;) to improve food safety.
  • Risk control:
    • regularly detect oil, moisture and particulate matter, and verify at least once every quarter.
    • Use high-efficiency precision filters (filtration accuracy ≥ 0.01 μm) to ensure stable compressed air quality.

3. special application scenarios (e. g. food film blowing, aseptic packaging)

  • custom Standard:
    • the total oil content should be controlled 0.01 mg/m & sup3; below it is necessary to combine multi-stage filtration (condensed activated carbon adsorption) and real-time monitoring system.
    • Simultaneous control of microbial indicators (such as the total number of colonies ≤ 10CFU/m & sup3;).

4. Detection and Compliance

  • detection frequency:
    • direct contact link: weekly detection of oil, moisture, particulate matter; monthly microbial detection.
    • Indirect contact link: monthly detection of key indicators, quarterly comprehensive physical examination.
  • Consequences of violations:
    • excessive oil content may lead to food odor, chemical pollution, enterprises face the risk of recall or legal penalties.
    • Enterprises that have not passed the ISO 8573 certification may lose their international market access.

5. Technology Solutions

Scene recommended equipment oil content target
direct contact with food oil-free compressor catalytic oxidation purifier≤0.01mg/m³
indirect contact with food high efficiency precision filter dryer≤0.1mg/m³
special high-demand applications on-line monitor for multistage filtration system≤0.01mg/m³

by strictly enforcing these standards, food companies can ensure the safety and compliance of their compressed air systems and the quality of their end products. It is recommended that a third-party agency be commissioned quarterly for full-project testing and annual ISO system review.

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