Underwriters Laboratories UL is in English (Underwriter Laboratories Inc.) Abbreviation. UL safety test by the United States the most authoritative, but also engage in community safety testing and identification of the larger civil society institutions. It is an independent, non-profit, for public safety professional organizations to do testing. It uses scientific testing methods to study the identification of materials, devices, products, equipment, and construction to life, property damage and whether the extent of injury; identification, preparation, issuance corresponding standards and help to reduce and prevent the creation of life by the loss of property information, while carrying out operational research the truth. In short, it is mainly engaged in product safety certification and operational safety certification services, with the ultimate aim is for the market to be a fairly safe level of goods, for personal health and property security are guaranteed to contribute. The product safety certification as to eliminate technical barriers in international trade in terms of effective means, UL to promote the development of international trade has also played an active role.
    UL was founded in 1894, the owners of the initial phase of UL fire insurance sector by providing capital to maintain movement, until 1916, UL was completely self-sustaining. After nearly a hundred years of development, UL has become a world well-known Certification Authority with its own set of strict system of organization and management, standards development and product certification procedures. UL by a safety experts, government officials, consumers, education, utilities, insurance industry and standards department of the Council composed of representatives of management, and daily work by the president, vice president of processing. 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 laboratories.
    UL standards, which almost involve all types of products, which is the basis for identification of products. UL has published more than 500 kinds of standards, of which 70% of American National Standards Institute (ANSI) adopted as the American National Standards Institute. UL
Proper use of the UL mark -> UL mark Introduction
    In the product or product-related use of the UL and the column name, classification, UL approved tag is used to distinguish the designated UL Follow-Up Service of products produced under the only way. UL of a company's name appears on the product catalog does not mean that the company's products are UL listed host name, classification or approval of, only those products with the UL mark can be considered to be the next in the UL Follow-Up Service products.
    UL for different service types, UL mark can be divided into three in the class, namely the column name, classification and recognition of tags, these tags is the most important component of the pattern UL symbols, these symbols are registered trademarks of UL. Three kinds of symbols are used for three different services, products, can not be mixed, or can be regarded as counterfeit products. As the classification tag is relatively rare in our country, so the following describes the column names and recognized only two kinds of tags. UL's services not only based on the United States UL standards, is also based on the Canadian Standards (C-UL), thus, UL marks are also divided into products for the UL and C-UL to meet the three kinds of products, and both, respectively, see below the various markers Table:

Tag types	Comply with UL Standard	Meet the Canadian Standards	Two are in line with
Column Name Symbol	<![endif]>	<![endif]>	<![endif]>
Symbol recognition	<![endif]>	<![endif]>	<![endif]>

Note: Prior to January 2008, for the same time, for the UL and C-UL listing or approval of products, you can also affixed UL and C-UL mark, but in 2008, you must use the third column of the table tag.