Standard No.:	GB/Z 44235-2024
English Name:	Nanotechnologies—Characteristics and measurement methods of air filter media containing polymeric nanofibers
Chinese Name:	纳米技术 含聚合物纳米纤维的空气过滤介质特性及测量方法
Chinese Classification:	L04    Basic standards and general methods
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR;SAC
Issued on:	2024-8-23
Implemented on:	2025-3-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	10500 words
Translation Price(USD):	315.0
Delivery:	via email in 1~3 business day

GB/Z 44235-2024 Nanotechnologies - Characteristics and measurement methods of air filter media containing polymeric nanofibers 1 Scope This document specifies the characteristics to be measured of air filter media containing polymeric nanofibres on the surfaces of a substrate. It also describes measurement methods for determining the individual characteristics. This document does not cover characteristics specific for health and safety issues. Note: The properties/performances assessment of air filter media related to applications requires the use of relevant published standards. The physical properties and performances of filtration media, such as pressure drop, and the particle removal efficiency of air filter media are measured with test methods suitable for specific applications. 2 Normative references There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 air filter filter device for separating solid or liquid particles (3.6) or gaseous contaminant from an air stream passing through the device Note 1: The device is generally formed of a layer or layers of porous, fibrous or granular material. Note 2: Air being cleaned by a filter must pass through the filter, whereas an air cleaner can reduce air contamination by any method. [SOURCE: ISO 29464:2017, 3.1.16, modified] 3.2 air filter medium porous permeable material employed in filtration (3.3) within which the filtrate is trapped or deposited Note: The filter medium is composed of a nanofibre (3.5) layer(s) and substrate (3.7). [SOURCE: GB/T 18690.1-2009, 2.27, modified] 3.3 filtration separation of contaminants from a fluid stream in which they are suspended through retention of the contaminants (by extension, also the whole of the activities involved in the construction and commissioning of a filter installation) [SOURCE: ISO 29464:2017, 3.5.29] 3.4 nanoscale length range approximately from 1 nm to 100 nm [SOURCE: ISO 80004-1:2023, 3.1.1] 3.5 nanofibre nano-object with two external dimensions in the nanoscale (3.4) and the third dimension significantly larger Note: The largest external dimension is not necessarily in the nanoscale. [SOURCE: ISO 80004-1:2023, 3.3.5] 3.6 particle minute piece of matter with defined physical boundaries Note 1: A physical boundary can also be described as an interface. Note 2: This general particle definition applies to nano-objects. [SOURCE: ISO 80004-1:2023, 3.2.1] 3.7 substrate base layer for depositing nanofibres (3.5) on the surface 4 Abbreviated terms AFM: Atomic Force Microscopy DSC: Differential Scanning Calorimetry FESEM: Field Emission Scanning Electron Microscopy FTIR: Fourier Transform Infrared Spectroscopy SAED: Selected Area Electron Diffraction SEM: Scanning Electron Microscopy STM: Scanning Tunnelling Microscopy TEM: Transmission Electron Microscopy TGA: Thermo Gravimetric Analysis UV-Vis: Ultraviolet⁃visible Spectrophotometry XRD: X-ray Diffraction