EI refers to the fire-resistance of panels, doors and windows in terms of the integrity (E) and the insulation (I). For example an EI30 door would give both 30 minutes of integrity and insulation against fire. Class EI fire-resistant glazing refers to building components which allow light to pass through and which, according to their fire resistance rating, not only prevent the spread of fire and smoke, but also the penetration of heat radiation. This means that the surface facing away from the fire must not heat up to more than 140K (mean value) or 180K highest individual reading). A cotton pad held next to it should not ignite or even smoulder. EI glazing when exposed to fire become opaque.
Fusions Contempo glass door is a market leading acoustic door available in a range of styles and thicknesses so the lad times can vary. However, depending on the levels of orders being put through the factory at time of order, for a single glazed contempo glass door, the lead time will be 4-6 weeks from site survey and 6-8 weeks from survey for double glazed.
What we have known to happen in the glass production process are microscopic impurities in the glass, known as inclusions. Most of these are completely harmless, but nickel sulfide (NiS) inclusions have been known to cause catastrophic failure of tempered glass. When certain types glass are heated in the tempering process, so are any NiS inclusions in the glass. However, when the glass is cooled rapidly to achieve the properties of tempered glass, the NiS remains in a high-temperature form. Over several years, the NiS will return to its low-temperature state, and in the process will increase in volume. This can cause cracking and additional stresses which, in tempered glass, have led to failures with no visible cause. This phenomenon has also been referred to as “glass cancer” and “spontaneous glass failure.