GB/T 25915.1-2021 PDF English
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Cleanrooms and associated controlled environments - Part 1: Classification of air cleanliness by particle concentration
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GB/T 25915.1-2021: Cleanrooms and associated controlled environments - Part 1: Classification of air cleanliness by particle concentration
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25915.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.040.35
CCS C 70
Replacing GB/T 25915.1-2010
Cleanrooms and associated controlled environments - Part
1.Classification of air cleanliness by particle concentration
(ISO 14644-1.2015, MOD)
Issued on. AUGUST 20, 2021
Implemented on. MARCH 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 6
1 Scope... 8
2 Normative references... 8
3 Terms and definitions... 9
4 Classification... 13
5 Demonstration of compliance... 14
Annex A (Normative) Reference method for classification of air cleanliness by particle
concentration... 17
Annex B (Informative) Examples of classification calculations... 23
Annex C (Informative) Counting and sizing of airborne macroparticles... 30
Annex D (Informative) Sequential sampling procedure... 37
Annex E (Informative) Specification of intermediate decimal cleanliness classes and
particle size thresholds... 45
Annex F (Informative) Test instruments... 47
Bibliography... 49
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is Part 1 of GB/T 25915, Cleanrooms and associated controlled
environments. The following parts have been issued for GB/T 25915.
-- Part 1.Classification of air cleanliness by particle concentration;
-- Part 2.Monitoring to provide evidence of cleanroom performance related to air
cleanliness by particle concentration;
-- Part 3.Test methods;
-- Part 4.Design, construction and start-up;
-- Part 5.Operations;
-- Part 6.Vocabulary;
-- Part 7.Separative devices (clean air hoods, gloveboxes, isolators and
minienvironments);
-- Part 8.Classification of air cleanliness by chemical concentration (ACC);
-- Part 9.Classification of surface cleanliness by particle concentration;
-- Part 10.Classification of surface cleanliness by chemical concentration;
-- Part 12.Specifications for monitoring of air cleanliness by nanoscale particle
concentration.
This document serves as a replacement of GB/T 25915.1-2010 Cleanrooms and
associated controlled environments - Part 1.Classification of air cleanliness. In
comparison with GB/T 25915.1-2010, apart from structural adjustments and editorial
modifications, the main technical changes are as follows.
a) Add apparatus requirements for particle determination in Clause 1 (see Clause 1);
b) Add “Normative references” (see Clause 2);
c) in Clause 3 Terms and definitions.
-- Modify the definitions of cleanroom, clean zone, classification, particle, etc.
(see 3.1.1, 3.1.2, 3.1.4, 3.2.1; 2.1.1 of the 2010 edition);
-- Delete terms such as ultrafine particle, fiber, U descriptor, customer and
supplier (2.2.5, 2.2.7, 2.3.1, 2.5.1 and 2.5.2 of the 2010 version);
-- Add definitions such as unidirectional airflow, non-unidirectional airflow,
resolution, maximum permissible measurement error, light scattering (discrete)
airborne particle counter, discrete-macroparticle counter and time-of-flight
particle sizing apparatus (see 3.2.7, 3.2.8, 3.4.1, 3.4.2, 3.5.1, 3.5.2, 3.5.3);
d) Add notes to Table 1 (see Table 1);
e) Add a clear application particle size range (see 4.2);
f) Add the intermediate decimal cleanliness classes and particle size thresholds (see
4.5);
g) Modify the contents of Annex B and Annex C and integrate them into the
normative Annex A (see Annex A; Annex B and Annex C of the 2010 version);
h) Enrich the content of Annex D to Annex B (see Annex B; Annex D of the 2010
edition);
i) Delete the content of ultrafine particle in Annex E, enrich the technical
requirements for counting and sizing of macroparticles, and integrate them into
Annex C (see Annex C; Annex E of the 2010 version);
j) Modify Annex F and integrate it into Annex D (see Annex F; Annex D of the 2010
edition);
k) Add notes on the intermediate decimal cleanliness classes and particle size
thresholds (see Annex E);
l) Delete Annex A “Illustration of cleanliness” (see Annex A of the 2010 version).
This document modifies and adopts ISO 14644-1.2015 Cleanrooms and associated
controlled environments - Part 1.Classification of air cleanliness by particle
concentration.
The technical differences between this document and ISO 14644-1.2015, and the causes
for these differences are as follows.
-- Modify Formula (A.1) in the normative Annex A. The reason is that Formula (A.1)
is applicable to clean rooms with smaller areas. For large-scale and ultra-large-
scale clean rooms above 10 000 m2 in our country, it exposes the problems of too
many sampling locations and failure to adopt more reasonable sampling statistical
principles.
This document also makes the following editorial modifications.
-- Delete B.6 in the informative Annex B.
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document shall be under the jurisdiction of National Technical Committee on
Cleanrooms Associated Controlled Environments of Standardization Administration of
China (SAC/TC 319).
Drafting organizations of this document. China Electronics Engineering Design
Institute Co., Ltd., Suzhou Antai Air Tech Co., Ltd., Suzhou Institute of Measurement
and Testing Technology, Shenzhen Leefung Cleanroom Construction Co., Ltd., Suzhou
Industrial Park Jiahe Environment Technology Engineering Co., Ltd., China
Electronics System Engineering No.2 Construction Co., Ltd., Shaanxi Zhongdian
Kingtek Electronics Engineering Co., Ltd., Suzhou Sujing Automation Instrument
Equipment Co., Ltd., TEDA Filters Co., Ltd., Tianjushi Engineering Technology Group
Co., Ltd., China Association for Standardization, Shanghai Indoor Contamination
Control Industry Association, Guangdong Association of Cleanroom Technology,
Tianjin University, Suzhou Huayu Purifying Equipment Co., Ltd., Shanghai Kexin
Testing Technology Co., Ltd., Suzhou Huatai Airtech Filter Co., Ltd., Beijing
Zhongbang Industrial Technology Co., Ltd., Shenzhen Laun Clean-Tech Co., Ltd.,
Shanghai AO Xuan Purification Technology Co., Ltd., Guangdong Laboratory Animals
Monitoring Institute, Suzhou Honbest Ultra Clean Technology Co., Ltd., Shenzhen
Junxinda Environmental High-tech Co., Ltd., Pharzen Science and Technology
(Shanghai) Co., Ltd., Guangxi Watyuan Filtration System Co., Ltd., Shanghai Food and
Drug Packaging Materials Testing Institute, Linkwell Science Technology Co., Ltd.,
Foshan Shunde Apollo Air-Cleaner Co., Ltd., Guangdong Fresh Filter Co., Ltd.,
Shanghai I-clearsky Environmental Protection Technology Co., Ltd.
Main drafters of this document. Wang Daqian, Qin Xueli, Liu Junjie, Chen Siyuan, Fan
Guofeng, Wang Tianyi, Gao Zheng, Chen Jian, Yu Xiaobiao, Wang Fang, Wu Zhijian,
Tong Guangcai, Wu Jianhua, Zhang Zhengbing, Xie Jingwei, Xu Xiaoli, Ding Zhijie,
Wei Jiaming, Geng Wentao, Liao Zhiming, Zhang Zhongling, Wang Hua, Huang Ren,
Gu Xiaoxiang, Liu Peng, Han Hui, Fan Yanghui, Zhu Jixing, Wang Bitong, Hong
Daoming, Zhang Yuhua, Peng Yongchang.
The previous versions of this document and the documents which are replaced by this
document are as follows.
-- It was first released as GB/T 25915.1-2010 in 2010;
-- This is the first revision.
1 Scope
This document specifies the classification of air cleanliness in terms of concentration
of airborne particles in cleanrooms and clean zones; and separative devices as defined
in GB/T 25915.7.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 25915.2-2021, Cleanrooms and associated controlled environments - Part 2.
Monitoring to provide evidence of cleanroom performance related to air cleanliness
by particle concentration (ISO 14644-2.2015, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4 Classification
Air cleanliness class by particle concentration shall be designated by an ISO Class
number, N. The maximum permitted concentration of particles for each considered
particle size is determined from Table 1.
5 Demonstration of compliance
The reference test method for demonstrating compliance is given in Annex A
(normative). Alternative methods or instrumentation (or both), having at least
comparable performance, may be specified. If no alternative is specified or agreed upon,
the reference method shall be used.
Annex A
(Normative)
Reference method for classification of air cleanliness by particle concentration
A discrete-particle-counting instrument is used to determine the concentration of
airborne particles, equal to and greater than the specified sizes, at designated sampling
locations.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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