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 (English Version)
This standard specifies the measurement conditions and calculation formulas for visible light transmittance (reflection) ratio of architectural glass, direct sunlight transmittance (reflection, absorption) ratio, total solar energy transmittance, ultraviolet transmittance (reflection) ratio, hemispheric emissivity and shading coefficient. This standard applies to the determination of the optical properties of architectural glass and its single-layer and multi-layer glass components.
GB/T 2680-1994 history
2021GB/T 2680-2021 Glass in building—Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors
1993GB/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