Laminated fire resistant glass door BS certification Thickness:15mm 18mm 21mm 25mm Max size:5100x2440mm Min size:300x200mm Fire resistant glass doorMonolithic Cesium-Kalium ... . The insulation of a Class A fire-resistant glass, fire insulation is good, transparent, a thickness of 15 mm, 18mm, 19mm, 20mm ... , 180 minAvailable sizes: 15mm 18mm 21mm 25mm laminated fire resistant glass door