01/05/03 Reflectance of a fresh aluminium coating on glass (the maximum loss when it's dirty should not exceed 5%) (nm) % 300 92.0 340 92.3 380 92.5 436 92.6 492 92.2 546 91.6 650 90.6 700 88.8 800 86.4 950 91.2 1000 93.0