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

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Scope

This document describes a method for determining the thermal conductivity of colorless optical
glass.
This document applies to the test of the thermal conductivity of colorless optical glass. The
flash method applies to the dynamic test of thermal conductivity and thermal diffusivity at a
given temperature point. The guarded hot plate method applies to the steady-state test of thermal
conductivity at a stable temperature difference. The test of thermal conductivity for other types
of glass may take this as a reference.

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	14,185
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Older Standard (superseded by this standard)	GB/T 7962.13-1987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