4. UV Protection Tempered insulated glass units can be treated with low-emissivity (low-E) coatings, which block a significant percentage of harmful ultraviolet (UV) rays. This protection helps prevent fading of furniture, flooring, and artwork indoors, extending the lifespan of these items.
Check whether the sealant is full, flat and dense, and whether there is cracking, foaming, softening sticky, pulverizing, degumming, discoloration, fading and chemical precipitates.