The UL is English underwriter to experiment( Underwriter Laboratories Inc.) Of JIAN3 XIE3.The UL safety experiments is the United States the most authoritative, also is the boundary is engaged in the safety up to experiment and authenticate of bigger and civil organization.It is an independent, not-for-profit, for professional organization that public safety do to experiment.It adopts the test method of science to study certain various material, equip, product, equipments, construct etc. to have degree of have no endanger and endanger to the life, property;Assurance, the plait write, the issue correspond of standard and contribute to reduce and prevent from result in the life property is subjected to the losing data, openning the exhibition true state of matter investigation business at the same time.In fine, it mainly is engaged in the safe attestation and the management safety certificate businesses of the product, its end purpose is a merchandise that is have the very safe level for the market, the behavior body health and the property safeties get the assurance to make a contribution.In regard to the valid means of the product safe attestation conduct and actions cancellation international trade technique barracks, UL for promote international trade of development also develop the aggressive function. The UL starts to set up in 1894, the beginning starts the stage UL lord at is provide by the fire prevention insurance section the funds maintenance action, until 1916, UL just complete independence.Through the development of hundred years, the UL has become the attestation organization of have the popularity of world, its oneself has one whole set of tight organization management system, standard development and product attestation procedures.UL from the council management that a representative who has the safe expert, government officials, consumer, educational circles, public utilities, the insurance industry and standard section constitute, daily pursuit from chief executive officer, deputy governor processing.Currently, the UL has five laboratories in the American mainland, the headquarters establishes the Northbrook town in the north of Chicago, establishing the homologous laboratory respectively in Taiwan and Hong Kongs at the same time.