GB/T 2680-2021
Glass in building—Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors

Standard No.

GB/T 2680-2021

Language

Chinese

Release Date

2021

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Lastest

GB/T 2680-2021

Replace

GB/T 2680-1994

Scope

This standard specifies the visible light transmittance, visible light reflectance, solar radiation flux, direct solar transmittance, direct solar reflectance, direct solar absorptance, total solar transmittance, secondary heat to the indoor side of architectural glass. Measurement methods of transmission coefficient, shading coefficient, light-to-heat ratio, ultraviolet transmittance, emissivity, total solar infrared heat transmittance and related window glass parameters. This standard applies to transparent materials such as single-layer glass and multi-layer window glass.

GB/T 2680-2021 Referenced Document

• ISO 10291 Glass in building - Determination of steady-state U values (thermal transmittance) of multiple glazing - Guarded hot plate method
• ISO 10292:1994 Glass in building - Calculation of steady-state U values (thermal transmittance) of multiple glazing
• ISO 10293 Glass in building - Determination of steady-state U values (thermal transmittance) of multiple glazing - Heat flow meter method

GB/T 2680-2021 history

• 2021 GB/T 2680-2021 Glass in building—Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors
• 1993 GB/T 2680-1994 Determination of light transmittance,solar direct transmittance,total solar energy transmittance and ultraviolet transmittance for glass in building and related glazing factors
• 0000年 GB 2680-1981