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GB/T 45921-2025Organic-electrochromic laminated glass used in buildings (English PDF)

建筑用有机电致变色夹层玻璃

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 30, 2025

Implementation date

January 1, 2026

Scope

GB/T 45921-2025 is the English-translated version of 建筑用有机电致变色夹层玻璃.

GB/T 45921-2025 is the Chinese national standard covering glazing that darkens on command, with the organic film laminated in — the visible light, total solar and ultraviolet transmittance measured in both the bleached and the tinted state, the switching time and the colour uniformity across a pane, the power draw and the insulation resistance, and the durability under heat, humidity, radiation and repeated cycling, which decides whether it still dims after years on a facade. First edition, under the China Building Materials Federation. In force from 1 January 2026. Issued on 30 June 2025, it has been in force since 1 January 2026.

Document preview — GB/T 45921-2025

National Standard of the People's Republic of China

ICS: 81.040.30
Classification: Q 33

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Requirement2
4.1 General Principles2
4.2 Appearance quality of discolored area2
4.3 Dimensional deviation3
4.4 Visible light transmittance in the color changing area3
4.5 Total solar transmittance in the color changing area4
4.6 UV transmittance of discolored area4
4.7 Other optical properties of the color-changing area4
4.8 Conversion Time4
4.9 Color uniformity of discolored area5
4.10 Power Limit5
4.11 Insulation resistance5
4.12 Temperature and humidity durability5
4.13 Radiation durability5
4.14 Cyclic durability5
5 Test methods5
5.1 General Principles5
5.2 Appearance quality of discolored area6
5.3 Dimensional deviation6
5.4 Visible light transmittance in the color changing area7
5.5 Total solar transmittance in the color changing area8
5.6 UV transmittance of discolored area8
5.7 Other optical properties of the color-changing area8
5.8 Conversion Time9
5.9 Color uniformity of discolored areas11
5.10 Power Limit12
5.11 Insulation resistance13
5.12 Temperature and humidity durability13
5.13 Radiation durability14
5.14 Cyclic durability14
6 Inspection Rules15
6.1 Inspection categories15
6.2 Factory Inspection15
6.3 Type inspection16
7 Packaging, labeling, transportation and storage17
7.1 Packaging17
7.2 Sign17
7.3 Transportation18
7.4 Storage18

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed by China Building Materials Federation.

This document is under the jurisdiction of the National Technical Committee for Standardization of Architectural Glass (SAC/TC255).

This document was drafted by: China National Testing Holding Group Co., Ltd., Guangyi Intelligent Technology (Suzhou) Co., Ltd., Jiangsu Xiuqiang Glass Craft Co., Ltd., China Building Materials Science Research Institute Co., Ltd., Niruo (Jiangsu) Electronic Technology Co., Ltd., Qinhuangdao Glass Industry Research and Design Institute Co., Ltd., Yilai Chuang (Beijing) Intelligent Materials Technology Co., Ltd., Zhuhai Haifa Xingye New Materials Technology Co., Ltd.

Tianjin Yaopi Engineering Glass Co., Ltd., Chongqing Youyou Lihong Glass Co., Ltd., Zhongli Glass Co., Ltd., Ningbo Niruo Electronic Technology Co., Ltd.

Co., Ltd., Building Materials Industry Technology Information Research Institute, and China Building Materials Inspection and Certification Group Qinhuangdao Co., Ltd.

The main drafters of this document are: Ding Zuoxin, Li Junjie, Li Huanhuan, Huo Yongchen, He Jiazhi, Meng Zheng, Hu Keyin, Hu Haohua, Song Xingwang, Li Guozhang, Shi Lin, Huang Di, Wei Nana, Liu Chengxiong, Jia Lidan, Sun Zhao, Yang Xuedong, Xu Wei, Yang Shuwei, Yang Guixiang, Wang Xin, Wu Qin, Tian Li, Wang Meili, Du Peng, Yang Liyong, Su Lili, Guo Jianbao, Zhang Hongyuan, Li Jiaying, Li Zhi, Feng Chunyan, Cheng Jianfei, Cao Zhenhu, Yu Hongliang, Liu Yuanmiao, Bao Ji, Zhang Rui, Tu Hao, Li Ming, and Wang Peikai.

Organic electrochromic laminated glass for buildings

1 Scope

This document specifies the requirements, test methods, inspection rules, and packaging, marking, transportation and Storage.

This document applies to the design, production and delivery of organic electrochromic laminated glass for architectural use.

2 Normative references

GB/T 191

GB/T 2680

GB/T 5137.2

GB/T 5137.3-2020

GB/T 11942

GB 15763.3

GB/T 42788-2023

3 Terms and Definitions

The terms and definitions defined in GB 15763.3 and GB/T 42788-2023 and the following apply to this document.

3.1 organic-electrochromic film

A film in which the organic color-changing dielectric material undergoes a reversible electrochemical reaction under the action of an external electric field and exhibits a change in spectral transmittance.

[Source. GB/T 42788-2023, 3.4, with modifications]

3.2

A laminated glass product having at least one layer of organic electrochromic film (3.1) in its structure and capable of achieving spectral transmission change.

3.3 bleached state

Under given control conditions, the visible light transmittance of electrochromic glass reaches the highest state. [Source. JC/T 2631-2021, 3.3]

3.4 tintedstate

Under given control conditions, the visible light transmittance of electrochromic glass reaches the lowest state.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 5137.3-2020 · GB 15763.3

Editions of GB/T 45921

Edition	Title	Revision	Status
GB/T 45921-2025	Organic-electrochromic laminated glass used in buildings	current edition	Current

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