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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25273-2025: Films for liquid crystal display (LCD) - Method for measuring haze and light transmittance - Integrating sphere method Status: Valid GB/T 25273: Historical versions
Basic dataStandard ID: GB/T 25273-2025 (GB/T25273-2025)Description (Translated English): Films for liquid crystal display (LCD) - Method for measuring haze and light transmittance - Integrating sphere method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G15 Classification of International Standard: 71.080.99 Word Count Estimation: 6,668 Date of Issue: 2025-02-28 Date of Implementation: 2025-09-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 25273-2025: Films for liquid crystal display (LCD) - Method for measuring haze and light transmittance - Integrating sphere method---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. GB/T 25273-2025 English version. Films for liquid crystal display (LCD) - Method for measuring haze and light transmittance - Integrating sphere method ICS 71.080.99 CCSG15 National Standard of the People's Republic of China Replace GB/T 25273-2010 Films for liquid crystal displays (LCD) Determination of haze and transmittance - Integrating sphere method Released on 2025-02-28 2025-09-01 Implementation State Administration for Market Regulation The National Standardization Administration issued ForewordThis 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. This document replaces GB/T 25273-2010 "Determination of haze of thin films for liquid crystal displays (LCD) - Integrating sphere method" and Compared with GB/T 25273-2010, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The expression of "scope" has been changed, transmittance has been added, and the scope of application of this document has been expanded (see Chapter 1,.2010 Edition). Chapter 1); b) The terms and definitions of haze have been changed (see 3.1, 3.1 of the.2010 edition); c) Added the terms and definitions of transmittance (see 3.2); d) In the “Principle” section, the principle description of the whole process of the integrating sphere haze meter measurement was added, the calculation formula of haze was simplified, and The formula for calculating light transmittance is given in Chapter 4 and Chapter 5 of the.2010 edition. e) The requirements for instruments have been changed and the expression has been simplified (see Chapter 5, Chapter 4 of the.2010 edition); f) The requirements for test specimens have been changed and the expression has been simplified (see Chapter 6, Chapter 6 of the.2010 edition); g) In “Test conditions”, delete “If there are other requirements, they shall be determined by negotiation between the supplier and the buyer” (see Chapter 7,.2010 Edition Chapter 7); h) The description of the operating steps has been changed and the expression has been simplified (see Chapter 8, Chapter 8 of the.2010 edition). 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 was proposed by the China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Optical Functional Thin Film Materials (SAC/TC431). This document was drafted by. Hefei Lucky Technology Industry Co., Ltd., Ningbo Changyang Technology Co., Ltd., Jiangsu Dongcai New Materials Co., Ltd. Liability Company. The main drafters of this document are. Sun Luyang, Sun Jingjing, Qi Haichao, Liu Changfeng, Liu Yulei, Li Chao, Sun Yue, Liu Hongmei, Gao Junhong, Zhou Di, Zheng Ziyin, Xu Qianqian, Zhou Yubo, Li Mingyong. The previous versions of this document and the documents it replaces are as follows. ---First published in.2010 as GB/T 25273-2010; ---This is the first revision. Films for liquid crystal displays (LCD) Determination of haze and transmittance - Integrating sphere method1 ScopeThis document describes the method for determining the haze and transmittance of thin films for liquid crystal displays (LCDs) using the integrating sphere method. This document applies to triacetylcellulose (TAC) film, polyvinyl alcohol (PVA) film and polyethylene terephthalate film for liquid crystal display (LCD) Determination of haze and transmittance of optically transparent films such as polyethylene glycol (PET) film and polymethyl methacrylate (PMMA) film.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 2918 Standard environment for conditioning and testing of plastic specimens3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Haze The ratio of the scattered light flux that deviates from the direction of the incident light through the sample to the transmitted light flux. Note 1.Expressed as percentage. Note 2.Usually only the scattered light flux that deviates from the incident light direction by more than 2.5° is used to calculate the haze. 3.2 Light transmittance The ratio of the luminous flux passing through the sample to the luminous flux incident on the sample. Note. Expressed as percentage. [Source. GB/T 33376-2016, 2.4.111, modified]4 Principle4.1 Direct measurement using an integrating sphere haze meter. The principle diagram for measuring haze and transmittance is shown in Figure 1. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25273-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 25273-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 25273-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 25273-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
