UL is the abbreviation of Underwriters Laboratories Inc. UL Safety Testing Institute is the most authoritative in the United States and the largest private institution engaged in safety testing and identification in the world.

UL was founded in 1894. In the initial stage, UL mainly relied on funds provided by the fire insurance department to maintain operations. It was not until 1916 that UL became fully independent. After nearly a century of development, UL has become a world-renowned certification agency with a complete set of strict organizational management systems, standard development and product certification procedures.

UL certification is a non-compulsory certification in the United States. It mainly tests and certifies product safety performance. Its certification scope does not include the EMC (electromagnetic compatibility) characteristics of the product.

Extended information:

UL marks are divided into 3 categories, namely listing, classification and recognition marks. The main component of these marks is the UL pattern, and they are all registered trademarks . They are not universally applicable to different service products.

If a company is recognized by UL, it does not mean that all of the company's products are UL products. Only products bearing the UL mark can be considered products produced under UL's tracking inspection service. UL uses the listing, classification, and approval marks used on products or related to products to distinguish UL products (see picture). UL's services are not only based on the U.S. UL standards, but also based on Canadian UL safety certifications. There are three types of UL safety certifications: recognized listing classification standards. UL stipulated that before January 2008, for products that have obtained both UL and CUL listings or Approved products can be affixed with both UL and CUL marks. After 2008, new marks will be used.

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