Underwriters Laboratories UL is in English (Underwriter Laboratories Inc.) Shorthand. UL safety test by the most authoritative in the United States is also engaged in community safety testing and identification of the larger civil society institutions. It is an independent, non-profit, do testing for public safety professional organizations. It uses scientific methods to study the test identified a variety of materials, devices, products, equipment and construction to life, property damage and whether the degree of hazard; identify, write, issue the appropriate standards and help to reduce and prevent the cause of life damage to other property information, while carrying out the facts research business. In short, it is mainly engaged in product safety certification and safety management certificate business, with the ultimate aim is for the market by a considerable level of product safety for human health and property is guaranteed to contribute. Product safety certification as to eliminate technical barriers to international trade in terms of effective means, UL to promote the development of international trade also played an active role. UL was founded in 1894, the initial phase of the Lord in the UL fire insurance sector by providing capital to maintain movement, until 1916, UL was completely independent. After nearly a hundred years of development, UL has become a world-known certification body has its own set of strict system of organization and management, standards development and product certification procedures. UL by a security expert, government officials, consumers, education, utilities, insurance and standards department of the Council composed of representatives of management, daily by the president, vice president of treatment. Currently, UL has five laboratories in the United States, headquartered in Chicago, Northbrook north of the town, while Taiwan and Hong Kong were established in the corresponding laboratory.