Color glass optical performance standard

　　 The visible light transmittance of 2mm, 3mm, 4mm, 5mm, 6mm colored float glass and colored ordinary flat glass is not less than 25%; the visible light transmittance of 8mm, 10mm, 12mm, 15mm, 19mm colored float glass is all Not less than 18%.　　The visible light transmittance, direct sunlight transmittance, and total solar transmittance allowable deviation of colored float glass and colored ordinary flat glass shall meet the requirements of Table 1. Table 1 Optical performance deviation category of colored glass Visible light (380nm～780nm) Sunlight (340nm～1800nm) Solar energy (340nm～1800nm) 'Transmittance% Direct transmittance% Total transmittance%' Colored float glass ±2.0 ±3. 0 ±4. 0　　 tinted ordinary flat glass ±2.5 ±3.5 ±4.5