The basic UL standard used to evaluate the performance of labels that display required marking information on UL certified end products is UL 969. Most UL end-product standards reference UL 969 or specify requirements based on UL 969. These products range from household appliances and consumer electronics to medical equipment and measuring instruments. Consequently, Recognized Marking & Labeling Systems (PGDQ2) and Printing Materials (PGJI2) are suitable for use on a wide range of UL certified products.
However, UL standards that are based on IEC standards now typically require compliance with a marking durability rub test that involves visual examination for legibility and adhesion after the labels are rubbed with a cloth soaked with one or more liquids, such as water, petroleum spirit (hexane), methylated spirit (ethyl alcohol denatured with methanol), isopropyl alcohol solution or other liquids. The choice and sequence of the liquids and the duration of rubbing vary among these standards. A list of UL standards that require compliance with a marking durability rub test is as follows:
- UL 201, Garage Equipment
- UL 60601-1, Medical Electrical Equipment
- UL 61010-1, Elect. Equip. for Measure, Control and Lab Use
- UL 61010A-1, Elect. Equip. for Lab. Use
- UL 60950-1, ITE
- UL 60335-1, Household and Similar Electrical Appliances
- UL 60745-1, Hand-Held Motor-Operated Electric Tools
- UL 60974-1, Arc Welding Equip
- UL 61058-1, Switches for Appliances
- UL 514A, Metallic Outlet Boxes
- UL 60065, Audio, Video and Similar Electronic Apparatus
- UL 61496-1, Electro-Sensitive Protective Equipment
As tests differ, clients must inform UL of the specific standard or standards against which they wish their labels to be evaluated.
Historically, marking durability rub test evaluations have been conducted as part of the end-product investigation, but label printers and material suppliers may now choose to have their products tested by UL in advance as part of UL’s Component Recognition Service. There are many advantages to this approach.
Most significant, the Recognition program provides label and material suppliers with an independent and objective means to demonstrate to end-product manufacturers that their labels or materials comply with the applicable marking durability rub test requirements. This program also adds confidence to supply chain integrity by performing the testing and surveillance where the labels and materials are produced, rather than when they are already part of an end product.
To submit labels for marking durability rub test evaluation, please contact UL today.