The Underwriter Laboratories Inc. (abbr. UL) is an independent Institution founded in Northbrook, USA, in the year 1894. Similar to the German “TÜV” (Technical Control Offices) they control goods of miscellaneous types that are imported to the USA or that are produced in the USA, e. g. as to their safety in usage. This is done in public interest and for consumer protection reasons. When a product or device is presented to the UL for approval, all component parts of the device are examined – i. e. also the type label is examined.
The UL Specification 969 „Standard for Marking & Labeling Systems“ defines the requirements for marking- and labelling-systems with adhesives, of printed labels, signboards and user guides. Labels are glued by UL onto testing surfaces typical for their application and exposed to typical strains to reveal evidence about loading capacity and readability. Especially the readability of the printing is most important as very often there is safety-relevant information printed on the labels or on the type-plates. If the criteria are met the products get the respective permission/recognition or endorsement as the case may be.
In this procedure only part components are checked, e. g. a type label, a cable, etc. The components can be recognized by the reversed RU. Robos has been producing part components with components recognitions since 1998 and possesses seven recognized material combinations on this level.
In this procedure final products, made from various part components are checked, e. g. a complete electronic device (overhead projector). Listed products are recognized by a circle with UL in its centre. The labels may only be produced by authorized label producers (the so-called “Authorized Label Supplier program”). Robos has re-joined this programme in July 2010.
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