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GB/T 7962.13-2025 English PDF

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GB/T 7962.13-2025: Test methods of colourless optical glass - Part 13: Thermal conductivity
Status: Valid

GB/T 7962.13: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 7962.13-2025	English	289	Add to Cart	3 days [Need to translate]	Test methods of colourless optical glass - Part 13: Thermal conductivity	Valid	GB/T 7962.13-2025
GB/T 7962.13-1987	English	119	Add to Cart	2 days [Need to translate]	Colourless optical glass test methods. Coefficient of thermal conductivity		GB/T 7962.13-1987

PDF similar to GB/T 7962.13-2025

Standard similar to GB/T 7962.13-2025

GB/T 7247.1 GB/T 41310 GB/T 39118 GB/T 7962.7 GB/T 7962.22 GB/T 7962.21

Basic data

Standard ID	GB/T 7962.13-2025 (GB/T7962.13-2025)
Description (Translated English)	Test methods of colourless optical glass - Part 13: Thermal conductivity
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	L50
Classification of International Standard	81.040.01
Word Count Estimation	14,149
Date of Issue	2025-06-30
Date of Implementation	2026-01-01
Older Standard (superseded by this standard)	GB/T 7962.13-1987
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

GB/T 7962.13-2025: Test methods of colourless optical glass - Part 13: Thermal conductivity

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7962.13-2025
ICS 81.040.01 CCSL50 National Standard of the People's Republic of China Replaces GB/T 7962.13-1987 Test methods for colorless optical glass Part 13.Thermal conductivity Released on June 30, 2025 Implementation on January 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Preface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Flash Method 1 4.1 Principle 1 4.2 Instrument 2 4.3 Sample 3 4.4 Test Environment 3 4.5 Test Step 3 4.6 Result calculation 3 5 Guarded hot plate method 4 5.1 Principle 4 5.2 Instrument 4 5.3 Sample 5 5.4 Test Environment 5 5.5 Test Step 5 5.6 Result calculation 6 6 Test Report 6 Appendix A (Informative) Flash method for testing the specific heat capacity of glass 7 Preface 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. This document is part 13 of GB/T 7962 Test methods for colorless optical glass. GB/T 7962 has been published in the following parts. --- Part 1.Refractive index and dispersion coefficient; --- Part 2.Fizeau plane interferometry for optical uniformity; --- Part 3.Optical uniformity holographic interferometry; --- Part 4.Temperature coefficient of refractive index; --- Part 5.Stress birefringence; --- Part 6.Young's modulus, shear modulus and Poisson's ratio; --- Part 7.Streakiness; --- Part 8.Bubble degree; --- Part 9.Light absorption coefficient; --- Part 10.X-ray resistance; --- Part 11.Precision test of visible refractive index; --- Part 12.Spectral transmittance; --- Part 13.Thermal conductivity; --- Part 14.Acid stability; --- Part 15.Moisture resistance stability; --- Part 16.Linear expansion coefficient, transition temperature and relaxation temperature; --- Part 17.Ultraviolet and infrared refractive index; --- Part 18.Kirschner hardness; --- Part 19.Abrasion; --- Part 20.Density; --- Part 21.Alkali resistance stability; --- Part 22.Stability to phosphoric acid; --- Part 23.Weathering stability. This document replaces GB/T 7962.13-1987 "Test methods for colorless optical glass - Test method for thermal conductivity", and GB/T 7962.13- Compared with 1987, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Increased the scope of application (see Chapter 1); --- Added terms and definitions (see Chapter 3); --- Added flash method (see Chapter 4); --- Changed the instrument, sample, test environment, test steps and result calculation in the guarded hot plate method (see Chapter 5, 1987 edition Chapter 2 to Chapter 5); --- Changed the test report (see Chapter 6, Chapter 5 of the 1987 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 Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Optics and Photonics (SAC/TC103). This document was drafted by. Chengdu Guangming Optoelectronics Co., Ltd., Chengdu Guangming Optoelectronics Co., Ltd., Hubei Xinhuaguang Information Materials Co., Ltd., Ningbo Sunny Infrared Technology Co., Ltd., China Ordnance Industry Standardization Institute, Hubei Feilihua Quartz Glass Co., Ltd. Jinan Guangwei Semiconductor Technology Co., Ltd., Shanghai Feilihua Shichuang Technology Co., Ltd., Suzhou Houpu Sensing Technology Co., Ltd., Qingdao Rong He Optoelectronics Technology Co., Ltd. The main drafters of this document are. Zhou Quanquan, Luo Lianghong, Zhang Qing, Xue Lisha, Wu Jinwei, Kuang Bo, Li Tianguo, Yang Miling, Zhou Gang, Zhu Yi, Ren Heqi, Zhang Han, Xia Guojun, Huang Yun, Hua Jun, Li Weina, Hu Minfeng, and Wang Guangxiang. The previous versions of this document and the documents it replaces are as follows. ---First published in 1987 as GB/T 7962.13-1987; ---This is the first revision.

introduction

Colorless optical glass is one of the basic optical materials widely used in optoelectronic information industry. The "Test Method" can guide the industry to more effectively solve the problems of product quality evaluation and physical and chemical performance testing of colorless optical glass. The various parts of GB/T 7962 specify the optical properties, internal quality, thermal properties, chemical properties, mechanical properties of colorless optical glass. GB/T 7962 is intended to consist of 27 parts. --- Part 1.Refractive index and dispersion coefficient. The purpose is to specify the technical requirements for the V prism method to test the refractive index and dispersion coefficient. --- Part 2.Fizeau plane interferometry for optical uniformity. The purpose is to specify the Fizeau plane interferometry method for testing optical uniformity. Technical requirements. --- Part 3.Holographic interferometry for optical uniformity. The purpose is to specify the technique for testing optical uniformity using holographic interferometry. Require. --- Part 4.Temperature coefficient of refractive index. The purpose is to specify the technical requirements for testing the temperature coefficient of refractive index using the minimum deviation angle method. --- Part 5.Stress birefringence. The purpose is to specify the technical requirements for testing stress birefringence. --- Part 6.Young's modulus, shear modulus and Poisson's ratio. The purpose is to specify the ultrasonic pulse echo method to test the elastic constants of materials technical requirements. --- Part 7.Striae. The purpose is to specify the technical requirements for the projection method to test striae. --- Part 8.Bubble Degree. The purpose is to specify the technical requirements for testing bubble degree. --- Part 9.Light absorption coefficient. The purpose is to specify the technical requirements for testing the white light absorption coefficient, and plans to add monochromatic light absorption Technical requirements for coefficient testing. --- Part 10.X-ray resistance. The purpose is to specify the technical requirements for testing the X-ray resistance of radiation-resistant optical glass. --- Part 11.Precision test of visible refractive index. The purpose is to specify the technical requirements for precision test of refractive index in the visible light region. --- Part 12.Spectral transmittance. The purpose is to specify the technical requirements for testing spectral transmittance. It is planned to increase spectral transmittance Comparison test technical requirements. --- Part 13.Thermal conductivity. The purpose is to specify the technical requirements for testing thermal conductivity using the flash method and guarded hot plate method. --- Part 14.Acid resistance stability. The purpose is to specify the technical requirements for surface method testing of acid resistance stability. --- Part 15.Moisture Stability. The purpose is to specify the technical requirements for the turbidity method to test moisture stability. --- Part 16.Linear expansion coefficient, transition temperature and relaxation temperature. The purpose is to specify the use of push rod method to test the thermal properties of materials technical requirements. --- Part 17.Ultraviolet and infrared refractive index. The purpose is to specify the autocollimation method and the minimum deviation angle method for testing ultraviolet and infrared refractive index technical requirements. --- Part 18.Kirkmarsh hardness. The purpose is to specify the technical requirements for testing Kirkmarsh hardness. --- Part 19.Abrasion. The purpose is to specify the technical requirements for testing abrasion. --- Part 20.Density. The purpose is to specify the technical requirements for density testing by buoyancy method. --- Part 21.Alkali stability. The purpose is to specify the technical requirements and classification rules for alkali stability testing using the weight loss method. --- Part 22.Phosphoric acid stability. The purpose is to specify the technical requirements and classification judgment of the weight loss method for testing phosphoric acid stability. rule. --- Part 23.Weathering stability. The purpose is to specify the technical requirements and classification judgment of turbidity method for testing weathering stability rule. --- Part 24.Stress-optical coefficient. The purpose is to specify the technical requirements for testing stress-optical coefficient. --- Part 25.Fluorescence characteristics. The purpose is to specify the technical requirements for testing fluorescence characteristics. --- Part 26.Stress uniformity. The purpose is to specify the technical requirements for testing the stress uniformity of high-precision optical glass. --- Part 27.Solar stability. The purpose is to specify the technical requirements for solar stability. Test methods for colorless optical glass Part 13.Thermal conductivity 1 Scope This document describes the method for determining the thermal conductivity of colorless optical glasses. This document is applicable to the test of thermal conductivity of colorless optical glass. The flash method is applicable to the test of thermal conductivity and thermal diffusivity at the temperature point. Dynamic test, the guarded hot plate method is suitable for steady-state test of thermal conductivity under a certain stable temperature difference. For test of thermal conductivity of other glasses, refer to use. 2 Normative references The contents of the following documents constitute the 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 903-2019 Colorless optical glass 3 Terms and Definitions The following terms and definitions apply to this document. 3.1 thermal diffusivity A physical parameter that characterizes the temperature propagation rate during unsteady-state heat conduction. 3.2 thermal conductivity The amount of heat transferred through a unit area of a material in the direction of heat flow under a unit temperature gradient per unit time. 3.3 Half-rise time t1/2 The time required for the temperature on the back side of the sample to rise to half of its maximum value. 4 Flash method 4.1 Principle In an adiabatic state and at a certain temperature, the flash light source emits a pulse at an instant, evenly irradiating the front of the sample to be tested, so that its surface

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