Different Types of UL Marks

Before products are labeled with Underwriters Laboratory approval labels, the marks or labels themselves are tested to see how they perform at the user-end level.

UL's marking and labeling

The marks or labels are evaluated in four separate areas, including the printing material used. In other words, they are evaluated on how the labels hold up against the wear and tear they are going to have to endure during use. Things such as heat, humidity and oils can damage the labels, therefore these labels are often painted or enameled on to adhere to the product. Metal products require this type of labeling. Even the area where the label is placed is considered; a good label is legible and placed in a prominent place on the product. Manufacturers who do not use the UL program cannot use the labeling unless they buy their labels from an approved supplier.

Authorized label supplier program

Under this program, companies are required to use only UL listing labels that are authorized. These are companies that Underwriters Laboratories have approved. They have gone through a certification process that ensures that they comply with UL labeling reqirements. UL publishes a list of companies on their website that are authorized to supply other companies with UL listing labels.

Private labeling

Many products today are manufactured by one company and sold by another. The rules for UL listing require these companies to apply for its multiple-listing service before it can market the products as UL-approved. Both the private label company and the original product manufacturer must complete the form and process.

There are three basic types of UL labeling in addition to the UL approval process. The labels or marks used depend on the type of product they are used on. The labels must withstand any use of the product without deterioration of the label or mark from the elements or environment in which the product is used.