... glass could maintain min. 90 minutes integrity at fire flame circumstance, based on GB15763.1-2001(China) and BS476( ... and stays clear at all times even when subjected to fire, providing distortion-free vision for escape. TECHNICAL DATA:Density (at ... .0±0.1x10-6Heat conductivity at 90: 1.26w/mKSoftening Point: 845±5Light Transmission: 91%Thickness: 4mm, 5mm, 6mm, 8mm, 10mm ...