These frequently asked questions are related to Marking & Labeling Systems that are intended to display safety and warning related information on products.

Further information can be obtained by contacting a member of UL’s Customer Service team. Customer Service is available worldwide to answer questions, provide information and assist customers working work with UL.

How does the Marking & Labeling Systems program differ from the Authorized Label Supplier program?

The Marking & Labeling Systems program covers labels and label materials that have been submitted and found to meet UL’s permanence of marking requirements for displaying safety-related information on end products. The Authorized Label Suppliers program specifically addresses the printing format and distribution of the UL Certification Mark.

When the UL Certification Mark and required safety-related information are printed on the same label (referred to as a combination or custom label), the label supplier must be an Authorized Label Supplier and the label must meet the performance requirements covered by the Marking & Labeling Systems program for that UL certified end product. To determine if a label supplier has coverage in both programs, search by company name on the Online Certifications Directory.

For additional information about the Authorized Label Supplier program or the proper use of UL Marks, contact your local UL label center. For inquiries regarding Marking & Labeling Systems, contact Customer Service.

Who is responsible for verifying information printed on a UL label or packaging?

The Label Center reviews the UL Certification Marks according to the process documented in the Printing UL Marks guide. The UL engineer handling the end-product submittal reviews engineering and cautionary marks and informs customers of label performance requirements. Promotional and advertising materials are required to follow UL’s Promotion and Advertising Guidelines.

What Conditions of Acceptability must a Marking & Labeling System meet?

The Conditions of Acceptability (typically application surfaces and use) that labels are required to meet are governed by the end-product Standard and determined by the UL engineer who investigated the end product. End-product manufacturers should reference the specific requirements written in the UL Report for their product or in the applicable UL Standard. They may also contact the Project Engineer who handled the engineering investigation of their product for additional guidance. Label suppliers interested in determining a customer’s label requirements should request that information directly from their customer.

How can I find and verify that a label printer can supply Recognized Marking & Labeling Systems? Where can I find the Conditions of Acceptability for their labels?

A database of Marking & Labeling System suppliers and the associated Conditions of Acceptability can be found by visiting the Online Certifications Directory. However, UL does not divulge information about the specific construction of Recognized labels or recommend specific label suppliers.

I am a label printer; how can I know if the labels I provide a customer are required to be Recognized under the Marking & Labeling Systems program?

The customer should specify that the label must be a Recognized Marking & Labeling System. They should also indicate the Conditions of Acceptability (e.g. application surfaces, indoor or outdoor use, temperature ratings, and additional exposures) for which the label must be suitable.

I am a manufacturer of UL certified end products. My Follow-Up Service Procedure specifies the use of a Recognized (Category Code Number PGDQ2) Marking & Labeling System. Can I use a Recognized (Category Code Number PGJI2) Printing Material instead?

When printed with ink specified in the Recognition, a Recognized (Category Code Number PGJI2) Printing Material is considered equivalent to a Recognized (Category Code Number PGDQ2) Marking & Labeling System because both are compliant with UL 969, Marking & Labeling Systems. Similarly for cUL Listed or Classified end products, a Recognized (Category Code Number PGJI8) Printing Material certified for Canada is considered equivalent to a Recognized (Category Code Number PGDQ8) Marking & Labeling System when printed with one of the inks mentioned in its Recognition because both are compliant with CSA C22.2 No. 0.15, Adhesive Labels.

As with Recognized (Category Code Number PGDQ2/8) Marking & Labeling Systems, acceptance of a Recognized (Category Code Number PGJI2/8) Printing Material and ink combination in a particular end-product application involves verifying that the Recognition covers the end-product requirements, including application surfaces, temperature ratings, and other use conditions.

I am a manufacturer of UL certified end products. What if I choose to use a label that is not UL Recognized or a label that is Recognized but does not meet the Conditions of Acceptability required for my product?

If the label you select for your end product is not UL Recognized or is Recognized but its Conditions of Acceptability do not cover your particular end-product application, an Unlisted Component evaluation is provided to the end-product manufacturer, rather than the component supplier, to determine the acceptability of the label. Learn more.

What samples are needed for Marking & Labeling Systems evaluations?

UL selectively tests labels of similar construction to represent a range of label constructions when certain commonalities exist. This process helps reduce cost and time to market for label suppliers. During the early stages of the project, a UL Engineer will provide a list of the required representative samples and quantities of each. Please refer to Submitting Products FAQ for details.

Is there a basic Marking & Labeling Systems test program? Are there specific label materials requirements?

The most basic (minimum) label test program involves testing a single application surface for Indoor or Indoor Dry Use. Larger test programs include multiple application surfaces and/or additional uses, such as Outdoor Use or exposure to lubricating oil. The Marking & Labeling Systems standard only specifies performance requirements for adhesive attached labels, not specific label material requirements.

How are direct surface-applied markings evaluated?

For direct surface-applied markings (e.g. etched, ink-stamped, die-stamped, painted, etc.), the requirements for durability and legibility are specified in the UL standard covering the particular end product being investigated.

Are Marking & Labeling Systems evaluated for electrical ratings, flammability ratings, or structural strength?

In the Marking & Labeling Systems program, UL evaluates labels only with respect to permanence of marking requirements. Flammability ratings, electrical ratings, and structural performance are not evaluated. If a label will be used in an application where an electrical rating or flammability rating is required, or is used to bond structural parts together, these issues would be addressed during the end-product evaluation with the complete equipment.

Adhesives intended for use in bonding structural parts or components are covered under the Polymeric Adhesive Systems, Electrical Equipment-Component program (Category Code NumberQOQW2). Electrical and flammability ratings for polymeric materials are covered under the Plastics-Component program (Category Code NumberQMFZ2).

Are membrane switches covered under the Marking & Labeling Systems program?

No. Adhesive-attached membrane switches that control appliances and electrical equipment are covered under the Membrane Switches program (Category Code Number WHSM2).

What printing equipment can an end-product manufacturer use to add information to a Recognized Marking & Labeling Systems Printing Material?

For thermal transfer ribbons, laser toners, and hot stamping foils, any printing equipment is considered compatible if it is capable of producing legible printing with good initial adhesion of ink to the label material. Other types of printing processes may require the end-product manufacturer to use a specific printer and ink combination that is referenced in the Recognition. The Marking & Labeling Systems program does not cover additional printing using hand implements, such as pen, marker, or pencil.

What are UL’s traceability requirements for off-site molding facilities of In-Mold Marking & Labeling Systems labels (Category Code Number PGIM2 and PGIM8)?

Off-site molding facilities must meet the traceability requirements specified on the Guide Information. The PGIM2 guide for UL Recognition is availablehereand the PGIM8 guide for cUL Recognition is availablehere.

Do unprinted Marking & Labeling Systems Materials require further evaluation before being used with an end product?

Printed labels made from Recognized label materials (blank label stocks, laminating adhesives, overlaminations) are not automatically considered Recognized printed labels. To be considered suitable for use on an end product, the complete printed label must be submitted to UL for evaluation. Depending on several factors, such as the Conditions of Acceptability desired for the label and the label materials used, testing of representative samples is usually necessary.

Are application surface blends (e.g. PC/ABS blend) for Marking & Labeling Systems investigated?

Labels suitable for application to two or more plastic, painted, or powder painted surfaces are automatically considered suitable for application to blends of those surfaces in any ratio with Conditions of Acceptability common to the components of the blend.

For example, a printed label is found suitable for the following two surfaces: Polycarbonate (PC) for Indoor use at a 80°C maximum rating and Acrylonitrile butadiene styrene (ABS) for Indoor & Outdoor use at 60°C maximum rating. With this suitability established, the printed label is considered acceptable for PC/ABS blends for the common Conditions of Acceptability: Indoor Use at 60°C maximum rating.

If a unique blended application surface is investigated, the specific blend and blend ratio is published as the application surface.

Are label converters allowed to repackage and distribute Recognized unprinted materials?

Companies who repackage Recognized unprinted label materials and wish to remark the products with the appropriate UL Mark to maintain traceability can be authorized to do so under UL’s Repackaged Recognized Component program. This program does not allow label repackagers/converters to print on the repacked materials, add additional layers, change layers, manipulate the properties, or make other modifications to the label materials that are repackaged.

Does UL certify labels to the Canadian Standard?

UL tests products to the Canadian Standard, CSA C22.2 No. 0.15, “Adhesive Labels.” However, the CSA Standard includes test methods that differ from UL 969 and additional testing is necessary to grant Canadian Recognition. Products found to be in compliance with the Canadian Standard are marked with the Canadian UL Recognition Mark.

Does UL test labels to other standards or requirements?

UL Verification Services can provide customized performance and verification testing of labels based on a buyer’s defined parameters or customer-accepted specifications. These tests provide retailers and buyers, original design manufacturers, and original equipment manufacturers confidence in the quality and reliability of the labels they manufacture or source from suppliers. Please contact Customer Service for additional assistance.

How do I enroll in a UL program or submit a label for evaluation?

To enroll in a UL program or to submit a label or material for evaluation, please contact Customer Service for assistance or use the Request for Quote form. This form will guide you in providing UL with the specific information needed to prepare your quote.

How do I advertise and promote the UL Programs I am in?

The UL Mark is a valuable marketing tool. This mark indicates that your product has successfully met stringent standards for product safety compliance. For information on accurately promoting your UL product certification, please visit UL’s Promotion and Advertising Guidelines webpage.