UL tests by an insurance company that is in English (Underwriter Laboratories Inc.)'s Abbreviated. UL safety test by the United States is the most authoritative and is also engaged in the sector to identify and test the security of the larger non-governmental organizations. It is an independent, non-profit, for public safety professionals to do the test. It uses scientific testing to determine a variety of research materials, devices, products, equipment and construction to life, property damage and whether the degree of harm; to identify, prepare and issue the appropriate standards and help reduce and prevent life Property loss, at the same time to carry out operational research the facts. In short, it is mainly engaged in product safety certification to prove the safety and operation of the business, with the ultimate aim is to be a considerable market for safety standards of goods for personal health and property are guaranteed. On product safety certification as the elimination of technical barriers to international trade an effective means to run, UL to promote the development of international trade also plays an active role. 

UL was founded in 1894, the initial phase of the UL main fire in the insurance sector by providing funds to maintain the action until 1916, UL was completely self-reliance. After nearly a century of development, UL has become the world's well-known certification body, has its own set of strict management system, development of standards and product certification procedures. By a UL safety experts, government officials, consumers, education, utilities, insurance and standards department of the Council composed of representatives of management and day-to-day work by the president, vice president of processing. At present, UL in the United States, there are five labs, based in Chicago, north of the town of Northbrook, at the same time, Taiwan and Hong Kong respectively set up the appropriate laboratory.