University of Missouri Extension

What does the UL symbol mean?

You ever wonder what the little UL symbol means on products you buy? This type of mark is seen commonly on appliances and computer equipment, furnaces and heaters, fuses, electrical panelboards, smoke and carbon monoxide detectors, fire extinguishers, life jackets, and thousands of other products.

If a product carries this mark, it means that Underwriters Laboratories found that samples of the product met UL's safety requirements.

As a not-for-profit product safety testing and certification organization, UL has been evaluating products in the interest of public safety since 1894.

Each year 4000 workers conduct 80,000 tests among 17,000 different products according to 717 standards. The UL mark is one of the most trusted symbols around. 10 billion products enter the marketplace with a UL mark. It’s all about safety.

Related Web site: http://www.ul.com

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Last updated: March 09, 2005
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