Standard No.:	GB/T 25915.8-2021
English Name:	Cleanrooms and associated controlled environments—Part 8: Classification of air cleanliness by chemical concentration (ACC)
Chinese Name:	洁净室及相关受控环境 第8部分：按化学物浓度划分空气洁净度(ACC)等级
Chinese Classification:	C70    Industrial dust and gas prevention technology
Professional Classification:	GB    National Standard
ICS Classification:	13.040.35 13.040.35    Cleanrooms and associated controlled environments 13.040.35
Source Content Issued by:	SAMR; SAC
Issued on:	2021-08-20
Implemented on:	2022-3-1
Status:	valid
Superseding:	GB/T 25915.8-2010 Cleanrooms and associated controlled environments—Part 8:Classification of airborne molecular contamination
Target Language:	English
File Format:	PDF
Word Count:	10500 words
Translation Price(USD):	315.0
Delivery:	via email in 1 business day

GB/T 25915.8-2021 Cleanrooms and associated controlled environments - Part 8: Classification of air cleanliness by chemical concentration (ACC) 1 Scope This document establishes the classification of air chemical cleanliness (ACC) in cleanrooms and associated controlled environments, in terms of airborne concentrations of specific chemical substances (individual, group or category) and provides a protocol to include test methods, analysis and time-weighted factors within the specification for classification. This document currently considers only concentrations of air chemical contamination between 100 and 10−12g/m3 under cleanroom operational conditions. This document is not relevant for application in those industries, processes or productions where the presence of airborne chemical substances is not considered a risk to the product or process. It is not the intention of this document to describe the nature of air chemical contamination. This document does not give a classification of surface chemical contamination. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 25915.6 Cleanrooms and associated controlled environments - Part 6: Vocabulary (GB/T 25915-2010, ISO 14644-6:2007, IDT) Note: ISO 14644-6:2007 has been withdrawn, while China still retains the corresponding national standard that is equivalent to it. 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 25915.6 and the following apply. 3.1 General 3.1.1 chemical contamination non-particulate substances that can have a deleterious effect on the product, process or equipment 3.1.2 air cleanliness by chemical concentration; ACC level of air cleanliness by chemical concentration, expressed in terms of an ISO-ACC Class N, which represents the maximum allowable concentration of a given chemical species or a group of chemical species, expressed in grams per cubic metre Note: This definition does not include macromolecules of biological origin, which are judged to be particles. 3.1.3 air chemical contamination any substance in the air that can, by its chemical nature, adversely affect the product, process or equipment 3.1.4 surface cleanliness by chemical concentration; SCC condition of the surface cleanliness with respect to its chemical concentration 3.1.5 surface chemical contamination any substance on the surface that can, by its chemical nature, adversely affect the product, process or equipment 3.1.6 contaminant category common name for a group of compounds with a specific and similar deleterious effect when deposited on the surface of interest 3.1.7 outgassing release of chemical substances in the gaseous or vapour state from a material 3.1.8 air cleanliness by chemical concentration (ACC) class grading number stating the maximum allowable concentration of a given chemical species or a group of chemical species in grams per cubic metre

Contents Foreword II Introduction IV 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 Demonstration of compliance Annex A (Informative) Parameters for consideration Annex B (Informative) Typical contaminants Annex C (Informative) Typical methods of measurement Annex D (Informative) Consideration of specific requirements for separative devices Bibliography