2026-04-13Views：
The oil content of air, especially the oil content of compressed air, is an important index to measure the oil content in the air. Its units are mainly the following:
mg/m & sup3; is a unit of absolute value, used to describe the quality of oil (including oil droplets, suspended particles, oil vapor) contained in a unit volume of compressed air. This unit is usually converted to specific standard atmospheric conditions, such as an absolute pressure of 0.1MPa, a temperature of 20°C and a relative humidity of 65%. Under this condition, mg/m & sup3; can directly reflect the absolute content of oil in the air.
PPM is a symbol for the amount of trace substances in a mixture, in parts per million or parts per million. In the field of compressed air, PPM is used to measure the trace concentration of oil in the air. It can be a weight ratio (PPMw) or a volume ratio (PPMv), but usually we refer to the weight ratio by PPM. The PPM unit makes it convenient to compare the oil content in different volumes or weights of air.
in practical applications, there is a certain conversion relationship between mg/m & sup3; and PPM. However, this conversion may vary depending on specific conditions (e. g. temperature, pressure, humidity). For example, under the conditions of atmospheric pressure of 0.1MPa, atmospheric temperature of 20 degrees Celsius and atmospheric relative humidity of 65%, 1ppm may be equivalent to a certain amount of oil per cubic meter of air (such as 1.2 mg, but please note that this value may vary according to different conditions).
different industries have different requirements for the oil content of compressed air. Some areas that require extremely high cleanliness, such as semiconductor chip manufacturing, usually require a total oil content of less than 1ppm in compressed air, and even require the use of 0-grade oil-free compressed air in some high-end applications. The oil-free level 0 here is not absolutely oil-free, but means that the oil content is less than a very low threshold, such as the CLASS 0 level in the ISO 8573-1 Part 2 standard.
in order to reduce the oil content in the compressed air, a variety of control measures can be taken, including the use of high-quality lubricating oil, optimizing the sealing performance of the compressor, and installing efficient oil and gas separators and filters. In addition, regular maintenance and testing of the compressed air system is also an important means to ensure that the oil content reaches the standard.
To sum up, the units of air oil content are mainly mg/m & sup3; and PPM, which are used to describe the absolute content and trace concentration of oil respectively. In practical applications, it is necessary to select appropriate units and control measures according to specific scenarios and requirements.
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