UL is the U.S. Underwriters Laboratories (Underwriter Laboratories Inc.) abbreviation. UL Safety Testing Institute is the most authoritative in the United States, but also in the world engaged in safety testing and accreditation of the larger civil institutions. It is an independent, for-profit, for the public **** safety test professional organizations. It uses scientific testing methods to determine the study of various materials, devices, products, equipment, buildings, etc. on life, property and the degree of harm; to determine, write, issue the corresponding standards and help reduce and prevent the loss of life and property by the loss of information, while carrying out factual research business. The scope of certification does not include the EMC (electromagnetic compatibility) characteristics of the product.
UL is mainly engaged in product safety certification and business safety certification business, its ultimate goal is to get for the market with a considerable level of safety of goods, to ensure the safety of personal health and property to contribute. Product safety certification as an effective means of eliminating technical barriers to international trade, UL to promote the development of international trade is also playing a positive role. UL was founded in 1894, the initial stage of UL mainly rely on the fire insurance department to provide funds to maintain the action until 1916, UL is completely self-supporting. After nearly a hundred years of development, UL has become a world-renowned certification body, its own has a set of strict organizational management system, standards development and product certification procedures. UL by a security experts, government officials, consumers, education, utilities, insurance and standards department representatives of the Council management, day-to-day work by the president, vice president of the handling. Currently, UL has five laboratories on U.S. soil, headquartered in the town of Northbrook, north of Chicago, as well as corresponding laboratories in Taiwan and Hong Kong. In the U.S., UL is the symbol of safety for consumers, and globally, UL is one of the most trusted providers of conformity assessment for manufacturers.
Services
The types of UL's product certification and testing services can be divided mainly into listing, recognition and grading.
1. Listing (LISTED): Generally speaking, the listing applies only to complete products and qualified personnel in the field to replace or install a variety of devices and installations, belonging to the UL listing services for a variety of products, including: household electrical appliances, medical equipment, computers, commercial equipment, as well as in the role of the building of the role of various types of electrical products, such as distribution systems, fuses, wires, switches and other electrical components. other electrical components. UL-listed products can usually be marked with the UL Listing Mark on each product. Usage of the Listing Mark.
2. Recognition (Recognized): Recognition service is a UL service project, the identification of products can only be UL listed, graded or other recognized products as components, raw materials used. Recognized products in the structure is not complete, or in the use of certain restrictions to ensure that the expected safety performance. In most cases, the tracking of Recognized Products falls into Category R. Approved products that fall into category L are electronic wire (AVLV2), processed wire (ZKLU2), wire harnesses (ZPFW2), aluminum wire (DVVR2), and metal flex tubing (DXUZ2). Approved products are required to carry the approval mark.
3. Classification: Classification services evaluate products for specific hazards only, or for products that implement standards other than UL standards, including internationally recognized standards such as IEC and ISO standards. Generally speaking, most of the graded products are not consumer products, but industrial or commercial use of the product. UL mark in the graded mark indicates that the product in the UL identification by certain limitations and regulations of the scope. For example, chemicals such as solvents used in industry are evaluated only to the extent that they are likely to catch fire when they reach their ignition temperatures. Certain product classification services and listing services, but generally only a certain aspect of the product or a number of aspects of the evaluation, such as in the United States, medical X-ray diagnostic equipment to comply with U.S. laws and regulations relating to radiation emission and beam accuracy, but because UL only X-ray as a classification of the product, so only the evaluation of its mechanical properties, electrical properties, and other non-radiation properties of these aspects.
Tracking inspection
For UL certification of an integral part, in order to ensure that UL's listed, recognized products continue to comply with UL standards and requirements, UL has developed a "tracking inspection" system." Tracking inspection" is sent by the UL field representatives around the world to the local production site of the factory UL products for tracking inspection. Its purpose is through the factory's production process, inspection process and products, against the UL standards and tracking inspection rules for verification, to ensure that the manufacturer's production process, inspection process and products always meet the requirements of UL.
UL94 certification of the performance of the material evaluation include:
94 flammability UL certification; UL certification 746A electrical and mechanical properties; UL certification 746B thermal aging procedures; UL certification 746C review file; plastic outdoor adaptive performance; components QMQS2; color QMLJ2.
In special environments used in the material is for the Specific final investigation of the performance required in the application of the product for which the material is used maintains the presence of certain critical operating and/or environmental conditions after exposure. This would include exposure to different types of ultraviolet (UV) radiation.
Introduction to the meaning of UL labeling
UL Listing Mark: This is one of the most commonly used UL markings. If this mark is affixed to a product, it means that a sample of that product meets UL's safety requirements. These requirements are primarily UL's own published safety standards. This type of marking is commonly seen on appliances, calculator equipment, stoves and heaters, fuses, power strips, smoke and carbon monoxide detectors, fire extinguishers and sprinkler systems, personal flotation devices such as life jackets and life buoys, bulletproof glass, and thousands of other products.C-UL Listing Mark: This marking applies to products sold in the Canadian market. Products bearing this mark are evaluated against Canadian safety requirements. Canadian safety requirements may differ from U.S. safety requirements. The Mark can be found on the following types of equipment: electrical and calculator equipment, vending machines, home burglar alarm systems, lighting, and many other types of products.
C-UL US Listing Mark: UL introduced this new listing mark in early 1998. It indicates compliance with both U.S. and Canadian requirements. The Canada/U.S. Mark is optional, and UL encourages manufacturers whose products are certified in both the U.S. and Canada to use this new combination Mark, but manufacturers can choose to continue to use the UL Mark for the U.S. or Canada only.
Marking style: The UL Mark is typically applied to the product and/or product packaging to indicate that the product has been certified by UL as complying with the requirements of a safety standard.
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