Underwriters Laboratories

Underwriters Laboratories Inc. (UL) is not part of the government. UL is an independent organization. See About UL for more information.

Manufacturers submit products to UL for testing and safety certification on a voluntary basis. There are no laws specifying that a UL Mark must be used. However, in the United States there are many municipalities that have laws, codes or regulations which require a product to be tested by a nationally recognized testing laboratory before it can be sold in their area. UL is the largest and oldest nationally recognized testing laboratory in the United States. UL does not, however, maintain a list of the jurisdictions having such regulations.

If you plan to market your product nationally or internationally, it is advisable to obtain UL Listing. If a limited marketing program is anticipated, check with the municipal office having jurisdiction in the particular areas to learn the local retail ordinances or product installation requirements applicable in that area.

Many companies make it their policy to obtain UL Listing not only to minimize the possibility of local non-acceptance, but also as a matter of corporate policy and commitment to minimize the possibility of risk in the use of their products.

UL is concerned with the safety aspect of all potentially hazardous products. UL's testing and certification services involve a wide variety of product categories, including marine products and life saving devices, fire suppression, fire containment, fire growth and control equipment as well as analysis of chemical vapors and industrial, mechanical and automotive equipment. We test for casualty hazards as well as products to protect against theft or fire and the proper installation of this equipment. Heating, air conditioning and refrigeration products are also tested. See our Testing and Certification Services page for more information. Additionally, UL, in partnership with UL DQS Inc., registers firms to international quality system standards, such as the ISO 9000 Series of Standards.

UL has more than 20 affiliates, international liaison and representative offices. The services offered at these locations may vary, according to the needs of the local region and staffing. To find out more information on the unique services our local offices can offer you, please contact us.