UL 969-2017 pdf download – Marking and Labeling Systems.
4.3 Samples are to be representative of the construction of the marking and labeling system or unprinted material to be tested. Significant construction variables such as top-surface or subsurface printing; top coating; face stock; overlamination or adhesive thickness range; partial adhesive coverage; differing types or colors of similar face stock or adhesive (for example, clear, pigmented, or metallized); and alternative printing processes and inks (including floodcoating for subsurface printed constructions) are to be represented in the samples provided. 4.4 The minimum recommended sample size is 2.0 by 2.0 in (50.8 by 50.8 mm) and the maximum recommended height of text is 0.063 in (1.60 mm). 5 Test Surfaces 5.1 Test surface panels are to be provided for each material on which the samples are to be tested. Panels are to be essentially flat, smooth, and rigid, and are to measure approximately 3 by 11 in (76.2 by 279.4 mm). Larger panels that can be cut, or smaller panels, if sufficient in number, may be used. If samples are to be investigated for use on a curved surface, curved surfaces or tubing of representative radius are to be provided. When samples are to be investigated for use on a textured surface, panels of the specific textured surface are to be provided. 5.2 Test surfaces are to be cleaned as described in 5.3 – 5.5 before the samples are applied. 5.3 A test panel, except for wood, is to be repeatedly wiped with cheesecloth (bleached cotton gauze) dampened with denatured ethyl alcohol or isopropanol until it appears clean. The surface is then to be wiped once more, with the dampened cheesecloth turned to expose a clean area, and is then allowed to dry in air for at least 1 minute.
6 Application of Labels to Surfaces 6.1 Two or more samples of a particular construction are to be applied to one or more panels of a test surface material for each exposure. Separate panels are to be used for each exposure.The number of samples applied to a panel may vary, depending upon sample size, and panel size. 6.2 Pressure-sensitive labels – Samples are to be applied to cleaned test surfaces as described below. Alternatively, if the manufacturer provides specific application instructions, the manufacturer’s instructions shall be followed. The release liner is to be removed from the construction, and the sample is to be held by the edges only and placed on the test surface with care to avoid bending and entrapment of air. To attach the sample uniformly, including edges and corners, a roller is to be rolled back and forth across the surface in each direction with manual pressure sufficient to provide uniform and complete contact with the test surface. A smooth-surfaced cylindrical roller (wood, plastic, or hard rubber) about 1-1/4 in (31.8 mm) in diameter and 1-1/4 in (31.8 mm) wide may be used. 6.3 Heat-activated and solvent-activated adhesive label samples are to be activated and applied to the test panels using the specific application instructions provided by the manufacturer, including recommended temperature, pressure, dwell time, solvent, etc., as applicable. 6.4 In-mold labels are to be molded at combinations of molding parameters representative of the extremes of temperatures, times and pressures at which parts made of the generic plastic may be molded. 6.5 Samples applied to the test surface panels shall be stored at 23 ±5°C (73.4 ± 9.0°F) and a relative humidity of 50 ±20 percent until they are subjected to the applicable exposure conditions.