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52 Label Adhesion Test
52.1 Unless known to be acceptable for the application, a pressure-sensitive label that is required to be
permanent shall be tested as described in 52.2.
52.2 After being subjected to the conditions described in 52.3 – 52.6 a pressure-sensitive label or a label
secured by cement or adhesive is considered to be of a permanent nature if immediately following
removal from each test medium, and after being exposed for 24 hours to room temperature following
removal from each medium each sample demonstrates good adhesion and the edges are not curled, and:
a) The label resists defacement or removal as demonstrated by scraping across the test panel
with a flat metal blade 1/32 inch (0.8 mm) thick, held at right angles to the test panel.
b) The printing is legible and is not defaced by rubbing with thumb or finger pressure.
52.3 OVEN-AGING TEST – Three samples of the label, applied to test surfaces as in the intended
application, are to be placed for 240 hours in an oven maintained at the temperature specified in Table
52.1.
OCTOBER 15, 2004 UL 458 70A
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