... tolerance: within 2mm 3. High solar transmittance DFG conservatory toughened glass Advantages1. Top grade clear float glass with high flatness2 ... % solar energy transmittance SizeMax: 2440-4800mm Min: 300-300mm Thickness Toughened: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm ... 5mm, 6mm, 8mm, and 10mm Tougheneed glass technology1. Clear toughened glass is produced by heating annealed glass to its softening ...