Tempered glass is today considered essential for safety and its use is widely recommended. If glass is used for bathroom enclosures, tempered glass must be used BY LAW. Tempered glass is safe because, should it break, it shatters into tiny pieces without blunt edges, preventing serious lacerations or cuts and this protecting the user from physical injury. This shattering pattern is standardized and covered by UNE-EN 12150-2:2005 ERRATUM: 2011 Standard, and must be complied with by bathroom enclosures manufacturers.