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GB/T 44753-2024Test method for liquidus temperature of ultra-thin glass (English PDF)

超薄玻璃液相线温度试验方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 26, 2024

Implementation date

May 1, 2025

Scope

GB/T 44753-2024 is the English-translated version of 超薄玻璃液相线温度试验方法.

GB/T 44753-2024 is the Chinese national standard covering the temperature at which the last crystals in a molten ultra-thin glass melt away — the gradient furnace and the temperature slope held along its tube, the travelling thermocouple that maps that slope, the polarizing microscope that finds where crystals still survive, the sample preparation, the procedure, the calculation and presentation of the result, and the test report, since a forming line run below the liquidus point devitrifies the sheet. First edition, under the China Building Materials Federation. In force from 1 May 2025. Issued on 26 October 2024, it has been in force since 1 May 2025.

Document preview — GB/T 44753-2024

National Standard of the People's Republic of China

ICS: 81.040.01
Classification: Q 30

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

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
3.1 Liquidus temperature
4 Test equipment
4.1 Gradient Temperature Furnace
4.2 Digital Polarizing Microscope
4.3 Mobile Thermocouple

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 is required.

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 Industrial Glass and Special Glass (SAC/TC447).

This document was drafted by: Beijing University of Technology, Rainbow Display Devices Co., Ltd., Sichuan Hongke Innovation Technology Co., Ltd., Jiangxi Wo Optoelectronics Co., Ltd., Shenzhen Shenzhongyuan Technology Co., Ltd., Hebei Window Glass Co., Ltd., Dongguan Yintaifeng Optical Technology Co., Ltd.

Co., Ltd., Xianning CSG Optoelectronic Glass Co., Ltd., Henan Ancai Hi-Tech Co., Ltd., Wuhu Changxin New Display Devices Co., Ltd., Lens Technology Co., Ltd., Dongxu Group Co., Ltd., China National Testing and Inspection Holding Group Co., Ltd., Nanjing Jianye District Construction Engineering Quality Supervision Station, Hebei Building Materials Vocational and Technical College, China 22nd Metallurgical Group Co., Ltd., Beijing Zhongtian Biaoke Standardization Technology Research Institute Institute Group Co., Ltd., Guizhou Provincial Building Materials Product Quality Inspection and Testing Institute, Beijing Xuhui Xinrui Technology Co., Ltd., Shanghai University of Technology, Shenzhen Zhongyoutu Technology Co., Ltd.

The main drafters of this document are: Tian Yingliang, Li Miao, Li Qing, Yi Weihua, Wang Mingzhong, Xu Lihua, Gao Xiaogang, Wang Lin, Zhong Ying, Tang Zhangang, Cang Limin, Yang Xifeng, Lin Jiafu, Ou Wanping, Zhang Xun, Yang Hui, Liang Xinhui, Zheng Jianjun, Li Lisheng, Wang Di, Yao Jianping, Meng Yanfang, Guo Li, Zhao Jinzhu, Wang Deli, Hua Zeman, Wen Yulin, Zhao Zhiyong, He Feng, Sun Shibing, Wu Yufeng, Wang Hui, Wang Midang, and Zhang Hua.

Test method for liquidus temperature of ultra-thin glass

1 Scope

This document specifies the test equipment, sample preparation, test procedures, results and presentation, and test report for ultra-thin glass liquidus temperature measurement.

This document is applicable to the liquidus temperature measurement of ultra-thin glass and can be used as a reference for the liquidus temperature measurement of other glasses.

2 Normative references

GB/T 15724

GB/T 24665

GB/T 30429

GB/T 32639

3 Terms and Definitions

The terms and definitions defined in GB/T 32639 and the following apply to this document.

3.1 Liquidus temperature

The temperature at which the crystals in molten glass can completely melt and disappear.

4 Test equipment

4.1 Gradient Temperature Furnace

The gradient furnace should be a horizontal tube heating furnace with a temperature gradient distribution inside the furnace tube. The furnace tube length is 600mm~900mm and the diameter is 50mm~80mm, the effective heating zone length is 300mm~500mm, the program temperature control method is adopted, and the maximum heating temperature is not lower than 1450°C, temperature gradient distribution 3°C/cm~10°C/cm, maximum temperature difference not less than 150°C. Temperature control thermocouple should comply with GB/T 30429 The required S-type thermocouple has a tolerance level of 1 and should be installed at the high temperature of the gradient furnace.

4.2 Digital Polarizing Microscope

The digital polarizing microscope should comply with the basic technical requirements of GB/T 24665, have the function of image capture and recording, and should be equipped with a ruler.

The movable platform can move a distance of not less than 60mm.

4.3 Mobile Thermocouple

The mobile thermocouple is used to measure and record the temperature distribution in the center of the gradient furnace tube. The S type should be selected in accordance with the requirements of GB/T 30429.

Armored corundum protective tube platinum rhodium thermocouple, tolerance level is 1, the effective length of the thermocouple is not less than 800mm; the thermocouple is fixed on the gradient temperature On the horizontal sliding bracket on the front side of the furnace, there is a millimeter-level scale on the horizontal sliding bracket, and the thermocouple can move horizontally along the center line of the furnace tube of the gradient temperature furnace.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 15724

Editions of GB/T 44753

Edition	Title	Revision	Status
GB/T 44753-2024	Test method for liquidus temperature of ultra-thin glass	current edition	Current

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