Tempered Glass – Impact resistant, The surface of the GLASS has a hardness of 8-9H, three times stronger than regular PET film. Even shard objects such as knives and keys will not scratch the GLAS.t. The GLASS has an oleophobic coating that prevents fingerprints and other contaminants and makes the film easy to clean. The GLASS is coated on the back with a strong silicon adhesive that makes installation easy and attaches the film firmly so as to not affect the touch screen’s sensitivity. If broken, the GLASS breaks into small pieces that are not sharp, making it safer than other glass products.