Oil content: ≤ 0.01 mg/m, close to oil-free

Oil content ≤ 0.01 mg/m & sup3; The compressed air has been very close to oil-free state however, strictly speaking, it still belongs to the category of "micro-oil" and needs to be further judged in combination with specific application scenarios and industry standards. The following is a detailed analysis:

1. definition of "oil-free" by international standards

according to the International Organization for Standardization (ISO) ISO 8573-1 standard (compressed air quality level), the oil content of compressed air is divided into the following levels:

• Class 0: The highest cleanliness level, oil content ≤ 0.01 mg/m & sup3;, and no oil vapor (that is, no oil pollution in any form).
• Class 1: Oil content ≤ 0.01 mg/m & sup3;, but trace oil vapor is allowed.
• Class 2-6: The oil content gradually increases, up to ≤ 5 mg/m & sup3;.

Conclusion: oil content ≤ 0.01 mg/m & sup3; of compressed air has reached ISO 8573-1 Class 0 or Class 1 standards it is internationally recognized as "high cleanliness" or "close to oil-free.

The Difference Between 2. and "Absolutely Oil-Free"

1. "Absolutely oil-free" in theory": Compressed air is completely free of any form of oil (including liquid oil, oil vapor and oil particles), but it is difficult to achieve in practice.
2. The practical significance of oil content ≤ 0.01 mg/m & sup3;:
   • the oil particles are usually ≤ 0.01 μm in diameter, invisible to the naked eye, and have no effect on most applications.
   • The oil vapor content is extremely low, and it almost does not cause contamination to sensitive processes (such as pharmaceuticals, food, semiconductors).
   • Need through professional testing equipment (such as gas chromatograph) to detect trace oil, daily use can be regarded as "oil-free".

3. oil content requirements for different application scenarios

1. medical field:
   • direct contact with patients(such as breathing machine, anesthesia machine): oil content is required to be less than or equal to 0.01 mg/m & sup3;(Class 0) to ensure absolute safety.
   • indirect contact(such as pneumatic door, surgical tools): oil content ≤ 0.1 mg/m & sup3;(Class 2) is acceptable.
2. Pharmaceutical Industry:
   • sterile preparation(such as injections, inhalation preparations): oil content is required to be less than or equal to 0.01 mg/m & sup3;(Class 0) to prevent oil contamination of drugs.
   • non-sterile preparation(such as tablets, capsules): oil content ≤ 0.1 mg/m & sup3;(Class 2) can meet the demand.
3. Food Industry:
   • direct contact with food(such as packaging, bottle blowing): oil content is required to be less than or equal to 0.01 mg/m & sup3;(Class 0), in line with food safety standards.
   • non-direct contact(such as pneumatic conveying): oil content ≤ 0.1 mg/m & sup3;(Class 2).
4. Electronic industry:
   • semiconductor Manufacturing: Oil content is required to be ≤ 0.003 mg/m & sup3;(far lower than Class 0) to prevent oil content from affecting chip performance.
   • General electronics assembly: Oil content ≤ 0.01 mg/m & sup3;(Class 0) can meet the demand.

4. how to achieve oil content ≤ 0.01 mg/m & sup3;?

1. Use oil-free air compressor:
   • type of Technology: Water-lubricated oil-free screw type, centrifugal type, oil-free scroll type, etc., completely avoiding lubricating oil from entering the compression chamber.
   • Advantage: No need for subsequent degreasing equipment, direct output of high cleanliness compressed air.
2. Configuration of high efficiency filtration system:
   • pre-filter remove large particles of impurities and liquid oil.
   • Precision filter: Filter particles above 0.01μm to further reduce oil content.
   • Activated carbon filter: Adsorb oil vapor to ensure oil content ≤ 0.01 mg/m & sup3;.
3. Regular maintenance and inspection:
   • replace the filter element regularly to avoid filter clogging and performance degradation.
   • Use professional testing equipment (such as oil meter) to regularly monitor the oil content to ensure compliance with standards.

5. Summary

• compressed air with oil content ≤ 0.01 mg/m & sup3; it has reached international high standards (Class 0 or Class 1) and can be regarded as "near oil-free" in sensitive industries such as medical, pharmaceutical, and food ".
• If "absolutely oil-free" is required (e. g. semiconductor manufacturing), a higher level of purification technology or a lower oil content standard (e. g. ≤ 0.003 mg/m & sup3;) should be selected.
• To achieve this goal, it is necessary to combine oil-free air compressors, high-efficiency filtration systems and strict maintenance management to ensure the continuous and stable quality of compressed air.