UL Certified

UL Certified

About UL certification

UL Mark Logo
UL Mark

UL LLC is a global safety certification company headquartered in Northbrook, Illinois. It maintains offices in 46 countries. Established in 1894 as the Underwriters’ Electrical Bureau (a bureau of the National Board of Fire Underwriters), it was known throughout the 20th century as Underwriters Laboratories and participated in the safety analysis of many of that century’s new technologies

UL is one of several companies approved to perform safety testing by the U.S. federal agency Occupational Safety and Health Administration (OSHA). OSHA maintains a list of approved testing laboratories, which are known as Nationally Recognized Testing Laboratories

History of UL

UL Headquarters in Illinois
UL Headquarters in Illinois

Underwriters Laboratories Inc. was founded in 1894 by William Henry Merrill. Early in his career as an electrical engineer in Boston, a 25-year-old Merrill was sent by underwriters issuing fire insurance to assess risk, and investigate the World Fair’s Palace of Electricity. In order to determine and mitigate risk, Merrill found it necessary to conduct tests on building materials. Upon seeing a growing potential in his field, Merrill stayed in Chicago to found Underwriters Laboratories

Merrill soon went to work developing standards, launching tests, designing equipment and uncovering hazards. Aside from his work at UL, Merrill served as the National Fire Protection Association’s secretary-treasurer (1903–1909) and president (1910–1912) and was an active member of the Chicago Board and Union Committee. In 1916, Merrill became UL’s first president

UL published its first standard, “Tin Clad Fire Doors”, in 1903. In 1905, UL established a Label Service for certain product categories that require more frequent inspections. In 1906, UL introduced the UL Mark to indicate products that had passed their testing. UL inspectors conducted the first factory inspections on labelled products at manufacturers’ facilities

Recognised Component Mark
Recognised Component Mark

UL has expanded into an organization with 64 laboratories, testing and certification facilities serving customers in 104 countries. It has evolved from its roots in electrical and fire safety to address broader safety issues, such as hazardous substances, water quality, food safety, performance testing, safety and compliance education and environmental sustainability

On January 1, 2012, Underwriters Laboratories transformed from a non-profit organization to a for-profit company in the U.S. A new subsidiary named simply UL LLC, a limited liability corporation, took over Underwriters Laboratories’ product testing and certification business