2026-04-14Views：
In the food industry, compressed air in direct contact with food, packaging or the production environment is subject to strict food grade quality index to ensure product safety and compliance. The following are the key indicators and requirements:
ISO 8573-1:2010 compressed air quality grade standard, food grade is usually required level 1 or higher.
International Food Standards IFS (International Food Standards), BRC (British Retail Standards), FDA (US Food and Drug Administration) guidelines.
Pharmacopoeia requirements: If used in the production of drugs or health products, it must comply with the relevant provisions of the European Pharmacopoeia or the Chinese Pharmacopoeia.
| Indicators | food grade requirements | detection method |
|---|---|---|
| solid particle | ≤ 0.1 μm(ISO Class 1), no visible oil/water | laser particle counter |
| moisture content | pressure dew point ≤ -40 ℃(no liquid water precipitation) | dew point meter |
| oil content | ≤ 0.01 mg/m³(ISO Class 1), recommended oil-free | oil vapor detector |
| total hydrocarbon content | ≤ 0.1 mg/m³(Avoid contamination of lubricating oil) | gas chromatography |
| Indicators | food grade requirements | detection method |
|---|---|---|
| total number of colonies | ≤ 100 CFU/m³(Some standards are more stringent) | agar plate culture method |
| mold/Yeast | ≤ 10 CFU/m³ | fungal selective medium |
| pathogenic bacteria | not to be detected(e. g. Salmonella, E. coli) | PCR or traditional culture |
| microbial control | it is recommended to install sterilization filter(0.2 μm aperture) | integrity testing (e. g. bubble point method) |
oil vapor residue: Use food Grade Synthetic Lubricant or oil-free compressors.
Volatile Organic Compounds (VOCs) regular testing, avoid the use of harmful substances such as benzene, chlorine and other consumables.
Smell: Sensory evaluation is required to ensure no odor.
temperature: It is recommended that the compressed air temperature ≤ ambient temperature +10 ℃ to prevent condensation water.
Relative humidity after drying, the relative humidity is less than or equal to 35%, which inhibits the reproduction of microorganisms.
regular inspection: Entrust a third-party laboratory to conduct all-item testing quarterly or semi-annually.
online monitoring: Install dew point meter and oil content detector for real-time warning.
Record keeping compliance with HACCP or ISO 22000 traceability requirements.
three-stage filtration pre-filtration (5 μm)+ precision filtration (1 μm)+ sterilizing filtration (0.2 μm).
Drying system freeze dryer or adsorption dryer (pressure dew point ≤-40 ℃).
oil-free lubrication: Adopt food grade synthetic lubricating oil or ceramic bearing.
food-grade compressed air needs to meet both physical cleanliness, chemical safety, microbiological control three requirements, through equipment selection, post-processing system and strict monitoring to achieve. Enterprises should select corresponding standards according to specific application scenarios (such as direct contact with food, packaging, and laboratories), and ensure that the entire process meets regulatory requirements.
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