JIS B 9920-1:2019 PDF Download

JIS B 9920-1:2019 is a standard that specifies the classification of air cleanliness in cleanrooms and clean zones based on the concentration of airborne particles. It focuses on particle populations with sizes ranging from 0.1 µm to 5 µm for classification purposes. The standard utilizes light scattering airborne particle counters (LSAPCs) to determine the concentration of particles in designated sampling locations. However, it does not address the classification of ultrafine particles smaller than 0.1 µm, which will be covered in a separate standard. Additionally, the standard cannot be used to characterize the physical, chemical, radiological, viable, or other properties of airborne particles. It references the ISO 14644-1:2015 standard as its international counterpart.