2026-06-24Views：
Ppm is a concentration unit that measures how much oil remains in compressed air, and its full name is one part per million.
To put it bluntly, consider compressed air as one million parts, of which several parts are oil and that is the value of ppm. For example, the oil content is 3ppm, which means that 3 parts of a million parts of air are oil. To put it more intuitively, it's about 1.2 milligrams of oil per cubic meter of air. The smaller the number, the cleaner the air. 5ppm is about 6 milligrams of oil per cubic meter, and 0.01ppm is about 0.012 milligrams of oil per cubic meter, which is hundreds of times worse.
This unit is very commonly used in the oil removal effect of filters, because the oil content in compressed air is very small, and it is too rough to express it in percentage. For example, 0.0001percent is neither intuitive nor easy to compare. Therefore, ppm is used to express it uniformly in the industry. The number is small but the meaning is clear, and you can see at a glance whether the air is dry or not.
The oil removal effect of the high-efficiency filter is marked as 0.01ppm or 0.003ppm, which means that after this filter, the oil in the air is pressed to 0.01 parts per million or 0.003 parts per million, which can be basically regarded as oil-free air.
When the water-lubricated air compressor is involved in the work, it does not use lubricating oil itself. The compression process relies on clear water to form a water film to reduce friction and seal gaps. The air discharged does not contain oil. This oil-free air is then processed by a high-efficiency filter, and the final output oil content can be extremely low in ppm. Because there is no oil mixed from the source, the back-end filter only needs to deal with the possible trace amount of oil mist, so the overall oil removal effect is easier to reach a very low ppm level than the combination of traditional air compressor and filter. The combination of water-lubricated air compressor and high-efficiency filter is especially suitable for scenes with high air cleanliness requirements, and the output is clean and oil-free compressed air in the true sense.
To sum up, ppm is the concentration unit of one part per million, which is used to indicate how much oil is left in the compressed air. The smaller the number, the cleaner the air. The water lubricated air compressor and the high efficiency filter can push this value to a very low level.
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Compressed air ppm is a unit used to describe the content of trace substances (such as oil, moisture, etc.) in compressed air, specifically referring to the concentration of one part per million. In the field of compressed air, ppm is often used to express the oil content in compressed gas, that is, parts per million
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