The clean room standards were first launched in the US in 1963, and today has become the common standard for the world. It is the quantitative criteria particulates per unit volume of air. It is divided into the size range dust and room type is determined by the number of particles larger size 0,5μm on a volume of 1 cubic foot (ft3) of air in the room.
a) Federal Standard 209 Standards (1963) [1]
This standard was first defined in 1963 (called 209), and then continually improved, finishing the 209 version A (1966), 290 B (1973 ) ..., to 209 E (1992).
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