GB/T 25915.1-2010: Cleanrooms and associated controlled environments -- Part 1: Classification of air cleanliness

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Scope

This part of GB/T 25915 divides the air cleanliness grades of clean rooms and related controlled environments only on the basis of the concentration of airborne particles in them.
The concentration refers to the total number of particles whose particle size is greater than or equal to the threshold (lower limit) particle size, and the prescribed threshold (lower limit) particle size is 0.1μm~5μm.
This section does not establish a cleanliness level for the total number of particles outside the specified particle size of 0.1μm~5μm. But you can use U descriptor and M to describe
Descriptors, respectively express the total number of ultrafine particles (< 0.1μm) and large particles (>5μm).
This section cannot be used to describe the physical, chemical, radiological or survival characteristics of airborne particles.
Note. The actual distribution of particle concentration greater than or equal to a certain size is generally difficult to predict, and usually changes with time.

Basic Data

Standard ID	GB/T 25915.1-2010 (GB/T25915.1-2010)
Description (Translated English)	Cleanrooms and associated controlled environments -- Part 1: Classification of air cleanliness
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	C70
Classification of International Standard	13.040.35
Word Count Estimation	26,240
Date of Issue	1/14/2011
Date of Implementation	5/1/2011
Adopted Standard	ISO 14644-1-1999, IDT
Regulation (derived from)	Announcement of Newly Approved National Standards No. 2 of 2011
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Standard specifies air cleanliness level of clean room and associated controlled environments. This standard can not be used to describe the physics of air particulates, chemical, radiological or survival characteristics.