How many particles are there 1
Particles - tiny parts with a big effect
How is the term particle defined?
Particles are damaging tiny parts that can permanently damage or even destroy your product. There are different definitions for this:
In the EN ISO 14644-1 standard, a particle is defined as a “small part of matter with physically defined boundaries”. The above ISO standard provides the following explanation for the particle size: "Diameter of a sphere, which can be measured with the aid of a device for determining the particle size, the measured variable of which has a comparable relationship to the measured variable of the particle".
In addition, these tiny particles of matter can be defined according to different sizes. A macroparticle, for example, is a "particle with an equivalent diameter greater than 5 µm" [ISO 14644-1]
Are there any other definitions?
Yes. The VDI guideline 2083-1 defines the term even more precisely as "solid or liquid particles with defined physical limits and a particle size between ≥ 0.1 µm and ≤ 5 µm".
How many particles are there in the air?
In the city air, for example, there are between 15 million and 100 million particles with a reference volume of 1 m³. In the mountain air, which is perceived as clean, around 10 million of them can still be found at an altitude of 2000 meters.
Is a clean environment free of particles?
In this particular environment, particles are filtered, but are still contained in the ambient air in various sizes and at a maximum concentration. To be able to classify the environment, the maximum number of each particle size is in the Particle cleanliness class of the air defined and must not be exceeded.
How can you keep harmful particles away from the product?
Damaging particles are removed with the help of Fan filter modules filtered from the air and released into the clean environment by means of the fans. In addition, a pre-filter can be integrated on the fan-filter module to protect the filter from coarse particles and to extend the running time of the filter. You can also find different versions of such a fan-filter module on the COLANDIS GmbH homepage.
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